{"title":"Arduino Boards","description":"\u003cspan data-mce-fragment=\"1\"\u003eArduino uno, Arduino nano, lilypad, Arduino esplora, Arduino mega...\u003c\/span\u003e","products":[{"product_id":"uno-r3-case","title":"UNO R3 Case","description":"\u003cp\u003eThe \u003cstrong\u003eUNO R3 Case\u003c\/strong\u003e is a protective enclosure made for the Arduino Uno R3 and compatible Uno-size boards. It shields the board from dust, knocks and accidental short circuits when it sits on a metal surface or near loose wires, so your Arduino lasts longer in the classroom, the lab or a finished project. 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Fix the Uno with M3 screws and plastic spacers so the solder joints underneath sit clear of the plate, then stick the breadboard down with its adhesive backing.\u003c\/p\u003e","brand":"Beirut ElectroCity","offers":[{"title":"Default Title","offer_id":41509152325766,"sku":"10020012","price":3.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1909\/3589\/products\/Universal-Experimental-Platform-with-UNO-R3-and-400-Tie-Point-Breadboard-and-Transparent-Clear-Acrylic-Board.jpg_Q90.jpg_57640be7-ab66-4686-bf70-08894622dd30.webp?v=1745910393"},{"product_id":"ps2-game-joystick-module","title":"PS2 Game JoyStick Module","description":"\u003cp\u003eThe \u003cstrong\u003ePS2 Game JoyStick Module\u003c\/strong\u003e is a dual-axis thumb joystick, similar to the sticks on a PlayStation 2 controller, mounted on a small breakout board. 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The colour sequence is fixed, so you cannot pick a single colour; for full colour control use an RGB LED module instead.\u003c\/p\u003e","brand":"Beirut ElectroCity","offers":[{"title":"Default Title","offer_id":41548562038918,"sku":"10030202","price":0.65,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1909\/3589\/products\/1.Main_1x_KY-0347ColorFarbenLEDModulfurArduino_1024x_db7defdf-fc30-4d39-8ed6-a21c6cc45dc8.jpg?v=1745910193"},{"product_id":"magic-cup-light-module","title":"Magic Cup Light Module","description":"\u003cp\u003eThe \u003cstrong\u003eMagic Cup Light Module\u003c\/strong\u003e combines a tilt switch and an LED on one small board. Used in pairs with an Arduino, it creates the magic light cup effect: when you tilt one module towards the other, as if pouring a drink, the light appears to flow from one LED to the other. 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Point the LED straight at the device, as range drops quickly at an angle; most phone cameras show the LED flashing when it transmits.\u003c\/p\u003e","brand":"Beirut ElectroCity","offers":[{"title":"Default Title","offer_id":41509093277830,"sku":"10030349","price":1.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1909\/3589\/products\/1.Main_1x_KY-005IRInfrarotSenderTransceivermodul_1024x_aa9daf3f-e41b-4b28-a32a-a5c78a1a9c20.jpg?v=1745909475"},{"product_id":"the-knock-sensor-module","title":"The Knock Sensor Module","description":"\u003cp\u003eThe \u003cstrong\u003eKnock Sensor Module\u003c\/strong\u003e is a small board with a spring-type knock switch that detects taps, knocks and sudden impacts. When the board is hit, the spring touches its contact and the signal pin changes state for a short moment, which a microcontroller can read as a digital input. It is a simple way to add knock-to-open, tap counters and impact alarms to Arduino and ESP32 projects.\u003c\/p\u003e\u003ch2\u003eKnock Sensor Module Specifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensing element:\u003c\/strong\u003e spring-type knock (tap) switch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput:\u003c\/strong\u003e digital, a short pulse on each knock\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePins:\u003c\/strong\u003e 3 (signal, VCC, GND)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupply voltage:\u003c\/strong\u003e 3.3 V to 5 V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible with:\u003c\/strong\u003e Arduino, ESP32, ESP8266 and Raspberry Pi GPIO\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eKnock Sensor Module Applications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSecret knock door locks and boxes\u003c\/li\u003e\n\u003cli\u003eTap and impact counters\u003c\/li\u003e\n\u003cli\u003eShock alarms for packages, doors and windows\u003c\/li\u003e\n\u003cli\u003eInteractive toys and STEM sensor kits\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\u003cul\u003e\u003cli\u003e1 × knock sensor module\u003c\/li\u003e\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eTip:\u003c\/strong\u003e The pulse from a knock is very short, so read the signal with an interrupt or a fast loop rather than a long delay(). 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Because there is no physical contact, it is fast, reliable and does not wear out, which makes it ideal for counting, speed measurement and position sensing with Arduino and other microcontrollers.\u003c\/p\u003e\u003ch2\u003ePhoto Interrupter Module Specifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor type:\u003c\/strong\u003e slotted (U-shaped) photo interrupter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLight source:\u003c\/strong\u003e infrared LED\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReceiver:\u003c\/strong\u003e phototransistor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput:\u003c\/strong\u003e digital signal that changes when the beam is blocked\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDetection:\u003c\/strong\u003e non-contact, for objects passing through the slot\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e small PCB with pin header\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003ePhoto Interrupter Module Applications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eWheel encoders with a slotted disc for robot speed and distance\u003c\/li\u003e\n\u003cli\u003eRPM measurement of motors and fans\u003c\/li\u003e\n\u003cli\u003eCounting objects, coins or sheets of paper\u003c\/li\u003e\n\u003cli\u003eHome and limit position detection on sliders, 3D printers and CNC machines\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\u003cul\u003e\u003cli\u003e1 × photo interrupter module\u003c\/li\u003e\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eTip:\u003c\/strong\u003e Read the output with a digital pin and use an interrupt when counting fast pulses, such as from an encoder disc. The object must block infrared light; thin or clear plastic may not interrupt the beam fully.\u003c\/p\u003e","brand":"Beirut ElectroCity","offers":[{"title":"Default Title","offer_id":41509141512326,"sku":"10030370","price":1.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1909\/3589\/products\/70b2ea9db21f8e2f8529393bc53df41b166c7305_1024_1024.jpg?v=1745910102"},{"product_id":"hc-sr501-pir-motion-sensor-module-green","title":"HC-SR501 PIR Motion Sensor Module Green","description":"\u003cp\u003eThe \u003cstrong\u003eHC-SR501 PIR Motion Sensor Module\u003c\/strong\u003e detects the movement of people and animals by sensing changes in infrared heat, and sets its output pin high when motion is seen. 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Mount it away from heaters, air conditioners and direct sunlight, which can cause false triggers.\u003c\/p\u003e","brand":"Beirut ElectroCity","offers":[{"title":"Default Title","offer_id":41536486211718,"sku":"10030394","price":1.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1909\/3589\/products\/40a421541eb41309befe187339e7929889ae514e_original.jpg?v=1745910506"},{"product_id":"mq-135-air-quality-sensor-detection-module","title":"MQ-135 Air Quality Sensor Detection Module","description":"\u003cp\u003eThe \u003cstrong\u003eMQ-135 Air Quality Sensor\u003c\/strong\u003e detection module senses harmful gases in the air, including ammonia (NH3), nitrogen oxides (NOx), benzene, alcohol, smoke and CO2. The sensing element changes its resistance as the gas level changes, and the module turns this into an analog voltage plus a digital output that switches at a threshold you set with the on-board potentiometer. It is a popular choice for Arduino and ESP32 air quality monitors and ventilation projects.\u003c\/p\u003e\u003ch2\u003eMQ-135 Air Quality Sensor Specifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor:\u003c\/strong\u003e MQ-135 metal-oxide (tin dioxide) gas sensor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDetects:\u003c\/strong\u003e NH3, NOx, alcohol, benzene, smoke and CO2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDetection range (datasheet):\u003c\/strong\u003e 10–300 ppm NH3, 10–1000 ppm benzene, 10–300 ppm alcohol\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupply voltage:\u003c\/strong\u003e 5 V (heater 5 V ± 0.1 V)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeater power:\u003c\/strong\u003e less than 800 mW\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutputs:\u003c\/strong\u003e AO (analog voltage) and DO (digital, threshold set with the potentiometer)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePins:\u003c\/strong\u003e VCC, GND, DO, AO\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eMQ-135 Air Quality Sensor Applications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eIndoor air quality monitors with Arduino or ESP32\u003c\/li\u003e\n\u003cli\u003eSwitching on a fan or ventilation when the air gets worse\u003c\/li\u003e\n\u003cli\u003eDetecting ammonia or solvent fumes in workshops and storage rooms\u003c\/li\u003e\n\u003cli\u003eSmart home and IoT data logging projects\u003c\/li\u003e\n\u003cli\u003eSensor experiments in schools and universities\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\u003cul\u003e\u003cli\u003e1 × MQ-135 air quality sensor module\u003c\/li\u003e\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eTip:\u003c\/strong\u003e The heater runs warm and needs time to settle: let the sensor run for a few minutes before taking readings, and run a new sensor for 24 hours or more before calibrating, as the datasheet advises. The module is good at showing changes in air quality, but it is not a calibrated CO2 meter.\u003c\/p\u003e","brand":"Beirut ElectroCity","offers":[{"title":"Default Title","offer_id":41556219527302,"sku":"10030455","price":2.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1909\/3589\/products\/1.Main_1x_MQ-135GasSensorModul_1024x_50c3603f-dfd9-46cd-a495-5837652aad58.jpg?v=1745909473"},{"product_id":"mq-2-smoke-gas-lpg-butane-hydrogen-sensor-module","title":"MQ-2 Smoke Gas LPG Butane Hydrogen Sensor Module","description":"\u003cp\u003eThe \u003cstrong\u003eMQ-2 Smoke Gas\u003c\/strong\u003e sensor module detects smoke and flammable gases such as LPG, butane, propane, methane and hydrogen, as well as alcohol vapour. Its tin dioxide sensing element lowers its resistance when these gases are present, and the module gives both an analog output for measuring changes and a digital output that switches at a threshold you set with the on-board potentiometer. 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Read AO with an analog pin for relative levels; this module is for projects and learning, not for legal or medical alcohol testing.\u003c\/p\u003e","brand":"Beirut ElectroCity","offers":[{"title":"Default Title","offer_id":41509170184326,"sku":"10030479","price":2.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1909\/3589\/products\/Main_1024x_36fe793b-9b72-4c6f-8a1e-038f654f58ce.jpg?v=1745910473"},{"product_id":"mq-4-natural-gas-methane-gas-sensor-module","title":"MQ-4 Natural Gas Methane Gas Sensor Module","description":"\u003cp\u003eThe \u003cstrong\u003eMQ-4 Natural Gas Methane Gas Sensor\u003c\/strong\u003e module detects methane (CH4) and natural gas in the air. It combines the MQ-4 sensing element with a comparator board, giving you an analog output that rises with gas concentration and a digital output that switches at a threshold you set with the on-board potentiometer. It connects easily to an Arduino, ESP32 or any 5 V microcontroller.\u003c\/p\u003e\u003ch2\u003eMQ-4 Natural Gas Methane Gas Sensor Specifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor:\u003c\/strong\u003e MQ-4 tin dioxide (SnO2) semiconductor gas sensor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTarget gases:\u003c\/strong\u003e methane and natural gas, with low sensitivity to alcohol and smoke\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDetection range:\u003c\/strong\u003e 300–10000 ppm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupply voltage:\u003c\/strong\u003e 5 V for the heater and board\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutputs:\u003c\/strong\u003e AO (analog voltage) and DO (digital, threshold set by the potentiometer)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePins:\u003c\/strong\u003e VCC, GND, DO and AO\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eMQ-4 Natural Gas Methane Gas Sensor Applications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eNatural gas leak alarms for kitchens and boiler rooms\u003c\/li\u003e\n\u003cli\u003eMethane monitoring in workshops and biogas projects\u003c\/li\u003e\n\u003cli\u003eIoT gas monitoring with ESP32 or ESP8266\u003c\/li\u003e\n\u003cli\u003eSafety demonstrations and STEM projects\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\u003cul\u003e\u003cli\u003e1 × MQ-4 gas sensor module\u003c\/li\u003e\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eTip:\u003c\/strong\u003e The sensor heater needs a few minutes to warm up before readings settle, and a new sensor gives the most stable results after running for about 24 hours. Use it for early warning in hobby projects; it does not replace a certified gas detector.\u003c\/p\u003e","brand":"Beirut ElectroCity","offers":[{"title":"Default Title","offer_id":41536480510086,"sku":"10030486","price":2.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1909\/3589\/products\/1.Main_1x_MQ-135GasSensorModul_1024x_b5611398-d7eb-45af-b125-6b159600504a.jpg?v=1745910440"},{"product_id":"mq-5-liquefied-gas-methane-gas-sensor-module","title":"MQ-5 liquefied gas Methane Gas Sensor Module","description":"\u003cp\u003eThe \u003cstrong\u003eMQ-5 liquefied gas Methane Gas Sensor\u003c\/strong\u003e module detects LPG, natural gas (methane) and town gas. Its tin dioxide sensing element lowers its resistance when these gases are present, and the module gives an analog output for measuring gas levels plus a digital output that switches at a threshold you set with the on-board potentiometer. It is well suited to kitchen and gas cylinder leak alarms built with Arduino or ESP32.\u003c\/p\u003e\u003ch2\u003eMQ-5 liquefied gas Methane Gas Sensor Specifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor:\u003c\/strong\u003e MQ-5 metal-oxide (tin dioxide) gas sensor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDetects:\u003c\/strong\u003e LPG, natural gas, methane and town gas; much less sensitive to alcohol and smoke\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDetection range (datasheet):\u003c\/strong\u003e 200–10000 ppm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupply voltage:\u003c\/strong\u003e 5 V (heater 5 V ± 0.1 V)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeater power:\u003c\/strong\u003e 800 mW or less\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutputs:\u003c\/strong\u003e AO (analog voltage) and DO (digital, threshold set with the potentiometer)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePins:\u003c\/strong\u003e VCC, GND, DO, AO\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eMQ-5 liquefied gas Methane Gas Sensor Applications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eLPG and natural gas leak alarms for kitchens and gas cylinders\u003c\/li\u003e\n\u003cli\u003eSwitching a buzzer, relay or extractor fan when gas is detected\u003c\/li\u003e\n\u003cli\u003ePhone alerts over Wi-Fi with ESP32 or ESP8266\u003c\/li\u003e\n\u003cli\u003eGas sensing experiments in schools and universities\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\u003cul\u003e\u003cli\u003e1 × MQ-5 gas sensor module\u003c\/li\u003e\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eTip:\u003c\/strong\u003e Power the module from 5 V and let the heater warm up for a few minutes before trusting the readings; run a new sensor for 24 hours or more before calibrating. The sensor gets warm in normal use. This module is great for hobby alarms and learning, but it is not a certified gas detector, so do not rely on it alone for safety.\u003c\/p\u003e","brand":"Beirut ElectroCity","offers":[{"title":"Default Title","offer_id":41509169463430,"sku":"10030493","price":2.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1909\/3589\/products\/1.Main_1x_MQ-135GasSensorModul_1024x_78d62c1f-b995-4786-9313-fd452004afbf.jpg?v=1745910444"},{"product_id":"mq-6-liquefied-isobutane-propane-sensor-module","title":"MQ-6 Liquefied Isobutane Propane Sensor Module","description":"\u003cp\u003eThe \u003cstrong\u003eMQ-6 Liquefied Isobutane Propane Sensor\u003c\/strong\u003e module detects LPG, isobutane and propane, the gases found in cooking gas cylinders and lighter fuel. Its tin dioxide sensing element lowers its resistance as the gas level rises, and the module gives both an analog output for measuring changes and a digital output that switches at a threshold you set with the on-board potentiometer. It is well suited to gas leak alarms with Arduino or ESP32.\u003c\/p\u003e\u003ch2\u003eMQ-6 Liquefied Isobutane Propane Sensor Specifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor:\u003c\/strong\u003e MQ-6 metal-oxide (tin dioxide) gas sensor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDetects:\u003c\/strong\u003e LPG, isobutane and propane, with low sensitivity to alcohol and smoke\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDetection range (datasheet):\u003c\/strong\u003e 200–10,000 ppm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupply voltage:\u003c\/strong\u003e 5 V (heater 5 V ± 0.1 V)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeater power:\u003c\/strong\u003e up to about 750 mW\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutputs:\u003c\/strong\u003e AO (analog voltage) and DO (digital, threshold set with the potentiometer)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePins:\u003c\/strong\u003e VCC, GND, DO, AO\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eMQ-6 Liquefied Isobutane Propane Sensor Applications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eLPG leak alarms for kitchens, gas cylinders and heaters\u003c\/li\u003e\n\u003cli\u003eSwitching a buzzer, relay or exhaust fan when gas is detected\u003c\/li\u003e\n\u003cli\u003eIoT gas alerts over Wi-Fi with an ESP32\u003c\/li\u003e\n\u003cli\u003eGas sensing experiments in schools and universities\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\u003cul\u003e\u003cli\u003e1 × MQ-6 gas sensor module\u003c\/li\u003e\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eTip:\u003c\/strong\u003e Let the heater warm up for a few minutes before taking readings, and run it for about 24 hours the first time for best accuracy. Power it from a 5 V supply that can deliver about 150 mA, and treat it as a hobby sensor, not a replacement for a certified gas detector.\u003c\/p\u003e","brand":"Beirut ElectroCity","offers":[{"title":"Default Title","offer_id":41509169430662,"sku":"10030509","price":2.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1909\/3589\/products\/1.Main_1x_MQ-135GasSensorModul_1024x_120fa155-4813-4ee5-b763-b6876b1935f4.jpg?v=1745910443"},{"product_id":"mq-7-co-carbon-monoxide-coal-gas-sensor-module","title":"MQ-7 CO Carbon Monoxide Coal Gas Sensor Module","description":"\u003cp\u003eThe \u003cstrong\u003eMQ-7 CO Carbon Monoxide\u003c\/strong\u003e coal gas sensor module detects carbon monoxide (CO) in the air. It pairs the MQ-7 sensing element with a comparator board, so you get an analog output that rises with CO concentration and a digital output that switches at a threshold you set with the on-board potentiometer. It connects directly to an Arduino, ESP32 or other microcontroller for CO monitoring and warning projects.\u003c\/p\u003e\u003ch2\u003eMQ-7 CO Carbon Monoxide Sensor Specifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor:\u003c\/strong\u003e MQ-7 tin dioxide (SnO2) semiconductor gas sensor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTarget gas:\u003c\/strong\u003e carbon monoxide (CO), with some cross-sensitivity to hydrogen\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDetection range:\u003c\/strong\u003e 20–2000 ppm CO\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeater (datasheet):\u003c\/strong\u003e 5 V for 60 s and 1.4 V for 90 s for CO measurement\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupply voltage:\u003c\/strong\u003e 5 V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutputs:\u003c\/strong\u003e AO (analog voltage) and DO (digital, threshold set by the potentiometer)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePins:\u003c\/strong\u003e VCC, GND, DO and AO\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eMQ-7 CO Carbon Monoxide Sensor Applications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eCO warning projects near heaters, generators and fireplaces\u003c\/li\u003e\n\u003cli\u003eMonitoring garages and workshops for exhaust fumes\u003c\/li\u003e\n\u003cli\u003eIoT air monitoring with ESP32 or ESP8266\u003c\/li\u003e\n\u003cli\u003eGas sensing experiments in STEM and university labs\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\u003cul\u003e\u003cli\u003e1 × MQ-7 carbon monoxide gas sensor module\u003c\/li\u003e\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eTip:\u003c\/strong\u003e Most modules run the heater at a constant 5 V, so treat the readings as a relative indication; for calibrated CO measurement follow the datasheet's 5 V \/ 1.4 V heater cycle. Let a new sensor run for about 48 hours before calibrating it, and never use it in place of a certified CO alarm.\u003c\/p\u003e","brand":"Beirut ElectroCity","offers":[{"title":"Default Title","offer_id":41536484507782,"sku":"10030516","price":2.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1909\/3589\/products\/1.Main_1x_MQ-135GasSensorModul_1024x_73f74087-8091-4adf-9a48-9247619b1559.jpg?v=1745910477"},{"product_id":"mq-8-hydrogen-gas-sensor-module-h2-alarm-detection","title":"MQ-8 Hydrogen Gas Sensor Module H2 Alarm Detection","description":"\u003cp\u003eThe \u003cstrong\u003eMQ-8 Hydrogen Gas Sensor Module\u003c\/strong\u003e combines the MQ-8 hydrogen sensor with a ready-made board, so you can detect hydrogen (H2) leaks with an Arduino, ESP32 or as a simple stand-alone alarm. It provides an analog output that follows the gas concentration and a digital alarm output whose trigger level you set with the on-board potentiometer.\u003c\/p\u003e\u003ch2\u003eMQ-8 Hydrogen Gas Sensor Module Specifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor:\u003c\/strong\u003e MQ-8, tin dioxide (SnO2) semiconductor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTarget gas:\u003c\/strong\u003e hydrogen (H2), with low sensitivity to alcohol and LPG\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDetection range:\u003c\/strong\u003e 100–10,000 ppm H2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupply voltage:\u003c\/strong\u003e 5 V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutputs:\u003c\/strong\u003e AO (analog) and DO (digital alarm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThreshold:\u003c\/strong\u003e adjustable with the on-board potentiometer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePreheat:\u003c\/strong\u003e over 24 hours before first accurate use\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eMQ-8 Hydrogen Gas Sensor Module Applications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eHydrogen leak alarms in labs and workshops\u003c\/li\u003e\n\u003cli\u003eBattery charging rooms and UPS cabinets\u003c\/li\u003e\n\u003cli\u003eFuel cell and electrolysis experiments\u003c\/li\u003e\n\u003cli\u003eSchool chemistry and STEM projects\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\u003cul\u003e\u003cli\u003e1 × MQ-8 hydrogen gas sensor module\u003c\/li\u003e\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eTip:\u003c\/strong\u003e Power the module from a 5 V supply that can handle the heater current; the sensor getting warm is normal. Read AO with an analog pin for gas levels or use DO as an on\/off alarm, set the threshold after warm-up in clean air, and on 3.3 V boards keep AO within 3.3 V with a voltage divider.\u003c\/p\u003e","brand":"Beirut ElectroCity","offers":[{"title":"Default Title","offer_id":41509097046150,"sku":"10030523","price":3.25,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1909\/3589\/products\/1.Main_1x_MQ-135GasSensorModul_1024x_e0b02aac-24f9-4ca5-a1cc-6edef00ee8d0.jpg?v=1745909472"},{"product_id":"dht11-digital-temperature-and-humidity-sensor","title":"DHT11 Digital Temperature and Humidity Sensor","description":"\u003cp\u003eThe \u003cstrong\u003eDHT11\u003c\/strong\u003e Digital Temperature and Humidity Sensor measures air temperature and relative humidity and sends both values over a single digital data wire. 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Connect VCC, DATA and GND, and if your module has no onboard pull-up resistor, add 4.7–10 kΩ between DATA and VCC.\u003c\/p\u003e","brand":"Beirut ElectroCity","offers":[{"title":"Default Title","offer_id":41509141807238,"sku":"10030608","price":3.5,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1909\/3589\/products\/1505275.jpg?v=1745909471"},{"product_id":"pm2-5-gp2y1010au0f-dust-smoke-particle-sensor-cable-capacitor-resistor","title":"PM2.5 GP2Y1010AU0F Dust Smoke\nParticle Sensor + Cable capacitor resistor","description":"\u003cp\u003eThe \u003cstrong\u003eGP2Y1010AU0F Dust Smoke Particle Sensor\u003c\/strong\u003e is an optical air quality sensor that detects fine dust and smoke particles. An infrared LED and a phototransistor are placed at an angle inside the housing, so light scattered by particles in the air hole is turned into an analog voltage proportional to dust density. It is widely used in PM2.5 and air purifier projects, and it comes with a cable plus the resistor and capacitor for its LED drive circuit.\u003c\/p\u003e\u003ch2\u003eGP2Y1010AU0F Dust Smoke Particle Sensor Specifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensing method:\u003c\/strong\u003e optical, infrared LED and phototransistor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupply voltage:\u003c\/strong\u003e 5 V ±0.5 V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurrent consumption:\u003c\/strong\u003e 20 mA max\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensitivity:\u003c\/strong\u003e about 0.5 V per 0.1 mg\/m³ of dust\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput voltage in clean air:\u003c\/strong\u003e about 0.9 V (typical)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLED drive:\u003c\/strong\u003e 0.32 ms pulse every 10 ms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating temperature:\u003c\/strong\u003e −10 to 65 °C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 46 × 30 × 17.6 mm\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eGP2Y1010AU0F Dust Smoke Particle Sensor Applications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eAir purifiers and air conditioners\u003c\/li\u003e\n\u003cli\u003eIndoor air quality and dust monitors\u003c\/li\u003e\n\u003cli\u003eSmoke detection experiments\u003c\/li\u003e\n\u003cli\u003eArduino and ESP32 environment stations\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e1 × GP2Y1010AU0F dust sensor\u003c\/li\u003e\n\u003cli\u003e1 × connection cable\u003c\/li\u003e\n\u003cli\u003e1 × resistor and 1 × capacitor for the LED circuit\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eTip:\u003c\/strong\u003e Wire the included resistor and capacitor into the LED circuit shown in the datasheet, which uses 150 Ω in series from 5 V and 220 µF to ground at the LED supply pin. Pulse the LED pin for 0.32 ms every 10 ms, read the output about 0.28 ms after the pulse starts, and average several readings for a steady value.\u003c\/p\u003e","brand":"Beirut ElectroCity","offers":[{"title":"Default Title","offer_id":41509097963654,"sku":"10030684","price":8.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1909\/3589\/products\/b824925497108053ab091ff623141c44.jpg?v=1745909470"},{"product_id":"tcrt5000-infrared-reflective-photoelectric-switch-line-tracker-analog","title":"TCRT5000 Infrared Reflective Photoelectric Switch\nLine tracker Analog","description":"\u003cp\u003eThe \u003cstrong\u003eTCRT5000 Infrared Reflective\u003c\/strong\u003e photoelectric switch is a line tracker sensor with an analog output. The TCRT5000 combines an infrared LED and a phototransistor side by side: the LED shines on the surface below and the phototransistor measures how much light is reflected back. Light surfaces reflect more infrared than black lines, so the output voltage changes as the sensor passes over a line, which makes it a favourite for line-following robots.\u003c\/p\u003e\u003ch2\u003eTCRT5000 Infrared Reflective Specifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor:\u003c\/strong\u003e TCRT5000 reflective optical sensor (IR emitter and phototransistor)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEmitter wavelength:\u003c\/strong\u003e 950 nm infrared\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDetection distance:\u003c\/strong\u003e best at about 2.5 mm, working range about 0.2 to 15 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDetector:\u003c\/strong\u003e phototransistor with a daylight-blocking filter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput:\u003c\/strong\u003e analog voltage that varies with the reflected infrared light\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eTCRT5000 Infrared Reflective Applications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eLine-following robots and robotics competitions\u003c\/li\u003e\n\u003cli\u003eDetecting black and white marks, edges or encoder stripes\u003c\/li\u003e\n\u003cli\u003eCounting objects or wheel rotations with a reflective strip\u003c\/li\u003e\n\u003cli\u003eEdge detection to stop robots driving off a table\u003c\/li\u003e\n\u003cli\u003eArduino and STEM robotics lessons\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\u003cul\u003e\u003cli\u003e1 × TCRT5000 analog line tracker sensor\u003c\/li\u003e\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eTip:\u003c\/strong\u003e Mount the sensor a few millimetres above the floor, read the output with analogRead() over the white surface and over the black line, and set your threshold halfway between the two values. Shield it from direct sunlight, which contains infrared and can upset the readings.\u003c\/p\u003e","brand":"Beirut ElectroCity","offers":[{"title":"Default Title","offer_id":41516506185862,"sku":"10030707","price":0.6,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1909\/3589\/products\/7c4e656a5083a9e70c90d4d84e52ed5c90f07c13_original.jpg?v=1745910151"},{"product_id":"tcrt5000-ir-reflex-tracking-sensor-module-smart-car","title":"TCRT5000 IR reflex Tracking Sensor Module Smart Car","description":"\u003cp\u003eThe \u003cstrong\u003eTCRT5000 IR reflex Tracking Sensor\u003c\/strong\u003e module detects whether the surface under it reflects infrared light, which makes it ideal for following a black line on a white floor. 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The current flows through the chip's internal copper path, which is electrically isolated from the signal pins, and the module gives an analog voltage proportional to the current. 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