Some resources to help you getting started with STM32 programming.
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220V 1-channel optocoupler isolation module
1. Punctuation: Test whether AC 220V exists
2. Output TTL level: It can be tested with SCM, voltage is 3-5V
3. Applicable to PLC 24V level
The microcontroller can detect the output TTL level. The power supply can be 3-5V
or PLC24V level
and then PLC input COM COM power supply 24V input terminal board signal output OUT, optical coupling board GND power supply negative
blue 2P 5.0 terminal connected to 220V voltage
3P terminal connected to the microcontroller input .
Safety Warning: When the power module is behind the white wire frame on the power strip, it cannot touch any equipment because it is high voltage. Pay attention to the safety of electricity.