Detection circuit on-off circuit should be how to design to use 89 c51

CodePudding user response:

The circuit on and off is to point to what mean

CodePudding user response:

reference 1st floor Stark_ response:

on and off the circuit refers to specific what does that mean?

Testing the main power switch time

CodePudding user response:

What kind of signal?

CodePudding user response:

Hypothesis with the relay contact as a signal of hair, so, microcontroller button procedures can be achieved,

CodePudding user response:

references a wise man should know already take good karma, 4/f, response:

hypothesis with relay contact as a signal of hair, so, microcontroller button procedures can be achieved,

Is to use relay trigger signal without any external circuit design of the relay signals received directly to the microcontroller IO port

CodePudding user response:

The relay contact is used as a button,

CodePudding user response:

Relay is general by low voltage control signal, to detect the state control signals, and with single chip microcomputer of time attention level,

CodePudding user response:

MCU output low level is the key