Hi. VIN and VOUT are not isolated, but you should have no problem using this with an independent microcontroller. GND is common between the JST connectors (battery negative) and the GND breakout pad. There needs to be a connection from GND to the GND / 0V on your microcontroller board. You can then: read the PUSH signal using any GPIO input with INPUT_PULLUP (PUSH is an open-drain output); control the OFF signal using any GPIO output (3.3V works well, the board is 5V tolerant, 1.8V may work but I haven't tested it). I hope this helps, Paul
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