To make the PowerBlock reliably work with the Raspberry Pi 4 you need to put a 10K resistor between GND (” – “) and the pin “S2” (GPIO pin 11). You can use any of the available GND pins, for example, “IN -” or “OUT -“.
The ControlBlock works with all models of the Raspberry Pi when ordered after 09/04/2019. Some additional tinkering is needed to make it work with the Raspberry Pi 4 when ordered before that date.
To make the ControlBlock reliably work with the Raspberry Pi 4 you need to put a 10K resistor between GND (” – “) and pin 11 of the GPIO header. You can use any of the available GND pins, for example, pin 9, which is next to pin 11 on the same side of the GPIO header
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