This is a design sensor circuit that can be used for sensing the light. This circuit is using a comparator LM311. This circuit is very simple design. This is the figure of the circuit.
This comparator is powered from 12 V DC supply and does not require negative supply to work efficiently. Feedback given to the comparator provides some hysteresis and the potentiometer allows to adjustment the sensitivity of the detector for darkness.
Part:
R1 = 1K
R2 = 100K
R3 = 10K
R4 = 2K
D1 = PHOTODIODE
D2 = 1N4001
K1 = RELAY SPDT
U1 = LM311
This comparator is powered from 12 V DC supply and does not require negative supply to work efficiently. Feedback given to the comparator provides some hysteresis and the potentiometer allows to adjustment the sensitivity of the detector for darkness.
Part:
R1 = 1K
R2 = 100K
R3 = 10K
R4 = 2K
D1 = PHOTODIODE
D2 = 1N4001
K1 = RELAY SPDT
U1 = LM311
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