Troubleshooting

[espruino-discuss3]

Posted at 2015-08-10 by user52526

>digitalWrite(A4,1);
=undefined
>digitalRead(A4);
=0
>pinMode(A4, "input_pulldown");
=undefined
>digitalWrite(A4,1);
=undefined
>digitalRead(A4);
=0
>pinMode(A4, "input_pullup");
=undefined
>digitalWrite(A4,1);
=undefined
>digitalRead(A4);
=0
>

[espruino-discuss3]

Posted at 2015-08-10 by DrAzzy

What's connected to A4? Could it be shorted to ground?

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Posted at 2015-08-10 by @gfwilliams

So the issue is that the last digitalRead should return 1? As discussed in another thread on here very recently, it's not a massive surprise that the first digitalRead returns 0, as before you call pinMode, digitalRead will make sure the pin is an input, which would make the voltage on it more or less random.

Is A4 connected to anything? Which board are you using, and do you have up to date firmware?

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Posted at 2015-08-10 by @gfwilliams

Just tried it here and it works fine for me.

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Posted at 2015-08-10 by user52526

I have to date firmware and A4 is connected to a diode. I'm using this board: http://www.espruino.com/EspruinoBoard

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Posted at 2015-08-10 by user52526

All good in the hood, thanks guys!

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Posted at 2015-08-11 by @gfwilliams

Was the diode connected to GND on the other side?