Light Dependent Resistor LDR 12mm

The Light Dependent Resistor LDR 12mm is a large photoresistor (photocell) with a 12 mm head whose resistance falls as the light on it gets brighter. It is a simple, low-cost way to sense light levels: put it in a voltage divider and read it with an Arduino or ESP32 analog input to build automatic night lights, light meters and sun trackers.

Light Dependent Resistor LDR 12mm Specifications

• Type: light dependent resistor (photoresistor)
• Size: 12 mm
• Behaviour: high resistance in the dark, low resistance in bright light
• Leads: 2, no polarity
• Mounting: through-hole

Light Dependent Resistor LDR 12mm Applications

• Automatic night lights and street-light models
• Light level sensing with Arduino and ESP32
• Solar trackers and sun-following projects
• Light-activated alarms and switches
• Science and electronics classes

What's in the Box

• 1 × 12 mm light dependent resistor

Tip: Connect the LDR in series with a fixed resistor, such as 10 kΩ, between 5 V and GND, and read the middle point on an analog pin. For the best sensitivity, measure the LDR in your own dark and bright conditions first and pick a fixed resistor near the middle of that range.

Orders placed before 14:00 are ready for pickup the same day. Delivery across Lebanon usually takes 1–3 working days.