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By Barnabybear
#62738 Hi, it should work fine. can you try a couple of things please. Remove the PIR and just use a wire link to 3.3V and see what happens. Also the output of the PIR needs to stay high for about 250mS for the boot to complete and the GPIO take over (if not it goes into a sort of boot limbo). Can you link the data sheet for the PIR you are using please.