I am having problems with some pins of nodemcu & espruino. I tried all available pins (GPIO0 to GPIO16) and I can only 'turn on' the pins
D0 >> GPIO0
D1 >> TX
D2 >> GPIO2
D3 >> RX
D4 >> GPIO4
D5 >> GPIO5
when I try to drive other pin I get the next error: "ERROR: Cannot change pins used for flash chip"
How I can drive the pins GPIO12, GPIO13 & GPIO14 ???
Try using the gpio pin number and see if that works (ex, digitalWrite(13,1) ).
There are definitely pins you can't touch because they're used for the flash chip (the 6 pins at bottom of the esp12E modules)
Also look at the NodeMCU.XX pins: http://www.espruino.com/Reference#NodeMCU
They already contain the mapping info for you.
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