The popular NE555 is used as a Schmitt trigger by connecting Pin 2 and threshold pin 6 inputs.
As the light falling on the LDR falls below a preset value the relay energises. This happens when the voltage at pin 2,6 is greater than 2/3 of Vcc. When light increases, the voltage at pin 2,6 falls and at 1/3 of Vcc the relay is de-energised. This gives a Hysteresis range. Diode IN 4001 is necessary for the
safety of the IC.
As the light falling on the LDR falls below a preset value the relay energises. This happens when the voltage at pin 2,6 is greater than 2/3 of Vcc. When light increases, the voltage at pin 2,6 falls and at 1/3 of Vcc the relay is de-energised. This gives a Hysteresis range. Diode IN 4001 is necessary for the
safety of the IC.
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