![]() I kept the LED driver voltage to one battery and did not need any resistance from the battery to the transistor The LED's will come on with movement, but since the photocell is facing straight up, my shadow was enough ![]() The CDS voltage becomes the only thing deciding if the LED driver should run or stay off. I tested the high signal circuit by sending 2.5 volts to the PNP transistor to turn it off with a PIR motion sensor module. ![]() A 10 uF capacitor will delay the turn on time! The CDS control and Pin 1 capacitor are optional for various requirements. The setup also allows higher voltage signals to be sent just by turning the transistors off. Here is what I came up with to control the 5252F chip while using a photocell to only light the LED's at night or in a dark room:Įach transistor setup conducts when the signal is not present to supply battery voltage to Pin 1 even if the CDS voltage is low.
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