An automatic dark sensor can be made using a PNP transistor(BC557). (more…)
How to use a preset? There are 3 pins/terminals on a preset. The maximum resistance that a preset can provide is written on it. If 100K is written on preset,.
[vc_row][vc_column][vc_column_text]To make an object counter we can use a simple dark detector circuit and a normal calculator. Pole and NO (Normally Open) terminals of a relay have to be connected.