Some resources to help you getting started with STM32 programming.
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220V 3-way optocoupler isolation module
1. Function: Test whether AC 220V exists; when there is 220V, the optocoupler can be grounded; otherwise, it does not conduct
2. Output high/low level: can be directly connected to SCM IO interface for testing, voltage is 3 -5V
3. Adapts to PLC connection, compatible with almost all PLC inputs