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ESP32: DAC does not seem to work #1574

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rovale opened this issue Nov 29, 2018 · 1 comment
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ESP32: DAC does not seem to work #1574

rovale opened this issue Nov 29, 2018 · 1 comment
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ESP32 This is only a problem on ESP32-based devices

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@rovale
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rovale commented Nov 29, 2018

It seems DAC does not work on the espruino_2v00_esp32.

Goal: dim an LED using the analogWrite(D26, 0.5) command.

Expected behaviour: LED dims to about 50%.

Actual behaviour: LED dims to about 0%. No light.

Tag: ESP32

Discussion: http://forum.espruino.com/conversations/328147/
@gfwilliams gfwilliams added the ESP32 This is only a problem on ESP32-based devices label Nov 30, 2018
@dgazzoni
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That’s not how LEDs work. You’re assuming they’re linear devices, but they’re not. There’s no reason not to stick to PWM in this case. The DAC probably is unable to supply enough current to light the LED properly at above, say, 25% of its typical current.

I suggest closing this as it’s definitely not a bug in Espruino.

@rovale rovale closed this as completed Apr 23, 2019
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@gfwilliams @rovale @dgazzoni