Hi : I input a high signal (4V) from the output pin of 7832 (OR Gate) to the GPIO pin of 8051. I see the signal voltage is right on scope. But the fact is the 8051 can't receive this signal. Why ? Is the current too small to start the GPIO ? ps: the output pin of 7832 drive another two component. One is BJT,the other is LED. Thanks
This condition is as below: I think the 8051 receivee the signal. But my camera can't work. I inspect the noise of ground. The noise is 500 mV. My camera's power supply is 3.3V. So .. Does anybody know whether it resulted the camera can't work ? Thanks