A0 is undefined

[espruino-discuss]

Posted at 2015-11-26 by user59035

I have an NODEMCU and installed the chrome extension for espruino - but when I try and run this code:

setInterval(function() {
  console.log(analogRead(A0));
}, 100);

I get this:

in function called from system
23
Uncaught ReferenceError: "A0" is not defined
 at line 1 col 24
console.log(analogRead(A0));

What's going on?

[espruino-discuss]

Posted at 2015-11-26 by user59035

I also get the same problem (adc is undefined) with this code:

print(adc.read(0))

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Posted at 2015-11-26 by tve

Try analogRead(D0), but I'm not sure anyone has tested the ADC functionality. The docs don't match reality, we need help from Gordon to define the A0 pin for the esp8266...

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Posted at 2015-11-27 by user59035

Ah, that did it, thank you.

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Posted at 2015-11-27 by @gfwilliams

@tve is there actually a separate A0 pin, or is it the same as D0? I wouldn't duplicate pin names - that'd just get confusing.

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Posted at 2015-11-27 by tve

Agreed. If you could add an appropriate definition to the board file that defines an A0 pin, I would appreciate. I tried and failed.

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Posted at 2015-11-27 by @MaBecker

@user59035 is this the board you are using ?
http://www.14core.com/wp-content/uploads/2015/06/Node-MCU-Pin-Out-Diagram1.png

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Posted at 2016-09-29 by davem

any update on this? I'm getting A0 undefined (v 1.87)

thx
David

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Posted at 2016-09-29 by @MaBecker

@davem - not as far as I know - use analogRead() works fine for me

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Posted at 2016-09-29 by DrAzzy

I think analogRead() ignores the argument you pass to it on the ESP8266... there's only one pin for which analogRead() is meaningful.

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Posted at 2016-10-04 by Aleksandrs

1v87.223 Copyright 2016 G.Williams
Espruino is Open Source. Our work is supported
only by sales of official boards and donations:
http://espruino.com/Donate
Flash map 4MB:512/512, manuf 0xe0 chip 0x4016

NodeMCU v3 + Espruino
analogRead();
Do not working.

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Attachments:

• 20160928_173010_resized.jpg