The following circuit works as a dark sensor. If the light falling on LDR is blocked, it switches on the LED D1. It has been configured in monostable mode of 555 timer which means that the circuit switches on the LED D1 for a specific time. The switching time is determined by the combination of resistance R1 and capacitor C1.
In this circuit, time (T) = 1.1xR1xC1 = 1.1x47x103x100x10-6= 5.17sec.
0 comments:
Post a Comment