Natwerk Designs

A logic control/circuits question?

Design and draw a block diagram for a logic control system which allows the street lights either to be turned on manually by a switch at any time or automatically by a light sensor when it is dark? ' having trouble drawing this, its probably not too complicated as its for G10 work

Public Comments

1. Have no facilities to draw here. Basically you have a light sensor driving an opamp or transistor amplifier. The output drives a relay that turns the street lights off/on. A manual switch can be inserted into the circuit in many places, best is probably to short out the transistor driving the relay. For reliability you want the switch late in the circuit. .