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zero cross detect optocouplers
you can detect zero crossing using amplifiers connect (-)pin to ground and the(+) to the signal u want when the wave be zero as ground the output will be zero other will give -VCC or +VCC as the signal move in the negative part or possitive one
how does the keypad 4*4 work with microcontroller AT89S52?
tha data come from keypad paraller or serial?binary or decimal?
if it binary.is it need encoder?or i can use BCD?
if i dont want to use both of them what will be the code in assembly to enter a password in keypad so the microcontroller...
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