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LDR 10 mm (Photoresistor)

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

ParameterValue
Diameter10 mm
Dark Resistance1–8 MΩ depending on model
Spectral Peak~540–560 nm (green light)
Max Voltage150–250 V DC (typical)
Power Rating100–250 mW
Response Time~20 ms rise, ~30–120 ms fall
Operating Temperature–30 °C to +70 °C
PackageEpoxy-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.


CopyEdit
5 V ── LDR ── A0 ── 10 kΩ ── GND

Sample Arduino code:

cpp
CopyEdit
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


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10.00 LE 10.00 LE

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LDR resistor