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ESP32 Heltec Dev Board - analogRead(37) returns 4095 #1888

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HarroldMonroe opened this issue Jun 27, 2022 · 1 comment
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ESP32 Heltec Dev Board - analogRead(37) returns 4095 #1888

HarroldMonroe opened this issue Jun 27, 2022 · 1 comment
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Not a TFT_eSPI issue

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@HarroldMonroe
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I'm using a ESP32 by Heltec with the TFT_eSPI library . Analog pin 37 (adc1_1) is the battery voltage pin.
The code analogRead(37) returns 4095. Which is the adc 12 bit max.
I get appropriate readings in sketches that don't use the TFT eSPI library.
Is this pin used/blocked in the library somewhere?
@Bodmer
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Bodmer commented Jun 28, 2022

The library only uses GPIO specified in the setup file.
See also here:
espressif/arduino-esp32#2422

@Bodmer Bodmer closed this as completed Jun 28, 2022
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@Bodmer @HarroldMonroe