LM393 Photosensitive Light Detection Sensor Module — LDR
This light-dependent resistor (LDR) module uses an LM393 comparator to convert an LDR's varying resistance into a clean digital TTL output. As ambient light drops below the threshold set by the onboard potentiometer, the output switches from HIGH to LOW — suitable for triggering Arduino interrupts or GPIO reads. An analogue output provides the raw LDR voltage for proportional light level measurement via ADC.
- LDR-based light detection — resistance drops from ~1MΩ (dark) to ~10kΩ (daylight)
- Digital output (DO) — LM393 threshold comparator, active low in dark
- Analogue output (AO) — raw LDR voltage divider output
- Adjustable threshold — onboard potentiometer
- 3.3V–5V supply
Best for
Automatic night lights, daylight-triggered irrigation systems, streetlight controllers, safe-to-open greenhouse vent controllers, light-following robots, and simple light level monitoring.
Why Kunkune
Shipped from UK stock. 60-day returns, no minimum order. Fast Royal Mail delivery.
Buying in bulk? For orders of 10+ units, contact us for trade pricing.
