Automatic street light controller
This street light controller circuit is designed around a single IC timer 555. This IC has been used in it’s bi-stable mode in the circuit. Two LDRs are also used in this circuit to differentiate between the day light and the darkness of the light. During the day time this bi-stable circuit remains reset by the LDR-2 while in the night time this bi-stable is set by the LDR-1. The output from the timer IC is given to the base of transistor T-2 which drives the relay in turn. Street light connections are given from the N/O contacts of the relay as shown in the figure. The number of lights which can be connected in parallel to this circuit depends directly upon the load rating of the relay contacts.
This street light controller circuit is designed around a single IC timer 555. This IC has been used in it’s bi-stable mode in the circuit. Two LDRs are also used in this circuit to differentiate between the day light and the darkness of the light. During the day time this bi-stable circuit remains reset by the LDR-2 while in the night time this bi-stable is set by the LDR-1. The output from the timer IC is given to the base of transistor T-2 which drives the relay in turn. Street light connections are given from the N/O contacts of the relay as shown in the figure. The number of lights which can be connected in parallel to this circuit depends directly upon the load rating of the relay contacts.
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