analogRead() and analog infrared sensor

[espruino-discuss]

Posted at 2022-02-04 by @MaBecker

Some analog infrared sensor have 0-3V output.
As I don’t want to use a voltage divider I was thinking if a reconfigure of analogRead for nrf52 boards could work to read sensor voltage directly.

Coding starts here

https://github.com/espruino/Espruino/blob/0a9f07a0fc21d1f989adaa8f35f74b29349307d6/targets/nrf5x/jshardware.c#L2648

[espruino-discuss]

Posted at 2022-02-07 by @gfwilliams

Not sure I understand the question?

While analogRead only outputs values 0-1, it's actually reading full-range 0-3.3v, so 0v->0 and 3.3v->1 - so you should be able to connect it direct?

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Posted at 2022-02-07 by @MaBecker

Not sure I understand the question?

Thanks, all good.

Great, so it is normalized to be the range of 0 - 1 - good to know - thanks.