DIY : Learn How to make a dark sensor using LDR (Light Dependent Resistor) and Operational amplifier (op-amp LM358). This circuit can be use in street light. Low light automatically trigger the output high.

LDR is a light-controlled variable resistor. The resistance of a photo-resistor decreases with increasing incident light intensity.

Download Circuit diagram- [ Ссылка ]

Component Used-
1. Op-amp LM358 IC
2. LDR Sensor
3. 1k ohm and 10k ohm Resistor
4. LED
5. Buzzer
6. 9v battery
7. Breadboard
8. Single Core jumper Wire.

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