10 mm LDR (Photoresistor) – Light-Dependent Resistor
Ideal for light-sensing applications, this 10 mm CdS photoresistor (LDR) reliably changes resistance with light intensity. Perfect for DIY electronics—like light meters, night lights, and automatic lighting systems.
📊 Technical Specifications
| Parameter | Value |
|---|
| Diameter | 10 mm |
| Dark Resistance | 1–8 MΩ depending on model |
| Spectral Peak | ~540–560 nm (green light) |
| Max Voltage | 150–250 V DC (typical) |
| Power Rating | 100–250 mW |
| Response Time | ~20 ms rise, ~30–120 ms fall |
| Operating Temperature | –30 °C to +70 °C |
| Package | Epoxy-encapsulated through-hole with 0.5 mm leads |
💡 Key Features
Compact 10 mm photosensitive surface for improved accuracy
High sensitivity in low light (high dark resistance)
Durable, epoxy-sealed housing
Versatile for light-activated electronics
🔧 Arduino Wiring Guide
Parts needed: LDR + 10 kΩ resistor → form voltage divider.
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5 V ── LDR ── A0 ── 10 kΩ ── GND
Sample Arduino code:
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const int LDRpin = A0;
void setup() {
Serial.begin(9600);
}
void loop() {
int val = analogRead(LDRpin);
Serial.println(val);
delay(500);
}
📱 App & Project Ideas
Lights that automatically turn on/off based on natural light
Light-sensitive alarms or safety systems
Solar trackers using light feedback
Integrate with ESP32/ESP8266 for remote monitoring dashboards
▶️ YouTube Tutorials
