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Polling multiple GPIOs

Turns out that the ground cable between the two microcontrollers had been dislodged. Putting that back in place fixed my problem.
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Sonoff Dual - Where to find GPIOs

Sonoff has only 2 GPIO pins, button 1 and button 2. Other 2 GPIO pins are used for two relay outputs. Refer here I hope this helped.
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3 votes

Sonoff Dual - Where to find GPIOs

According to github, Sonoff Dual R2 is the replacement for Sonoff Dual. Compared to the Dual the main differences/improvements for the Dual R2 are: As the second microcontroller has been ...
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3 votes

Can somebody explain why some pins on Olimex ESP32-EVB cannot be used?

For the ESP32-EVB, most, if not all pins, are used by all of the stuff they pack on the board. If you look at the schematic for that particular board, you'll see that UART0 (GPIO pins 1&3) are ...
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Sonoff Dual - Where to find GPIOs

You can find what you need at the bottom of the aforementioned link. Further to this, my advice is that the schematic shows that, apart from the relay, button and LED GPIOs, (which you probably ...
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  • 131
1 vote
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Mongoose OS and button press detection

As it turns out, GPIO pins 34, 35, 36 and 39 are actually GPI - input only and have no internal pullup or pulldown resistors. I switched to a different GPIO with internal pullup and this solved the ...
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1 vote
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How to change dell edge gateway 3001 gpio pin to analog

Not sure if you found the answer you were looking for, but thought I'd actually sign up and give you some pointers since I've just been down this path myself. The tool you need is 'dcc.cctk' which ...
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