INPUT ADC values and OUTPUT voltage

[Meric NESSANGE]

Hi there,
3 noob questions about GPIO :

• Voltage range of the ADC seems to be 1.1V, and can be extended to 3.3V playing with attenuation, right ?
• What is the given values by the read method (val = apin()) : Is it from 0 to 1023, as an arduino ? Is it directly in mV ?
• What is the output Voltage when output.value(True) ?

I dont find these information in the manual...
Thanks.

[livius]

@Meric-NESSANGE said in INPUT ADC values and OUTPUT voltage:

Worse or better than an arduino? Or the same order of magnitude ?

If your arduion use ESP32 then the same.
If you use digital output then it should be near max voltage 3.3.

For the input read the docs, especially bottom green frame
https://docs.pycom.io/firmwareapi/pycom/machine/adc/#app

[Meric NESSANGE]

@jcaron Hi, and thanks for answer.
OK, both are possible, I missed it ^^
If I read with adcchannel.value() (so, not in mV), do you know the max value (or the value of 1 step) ?
For the output, I use the digital way : a = machine.Pin('P2', mode = Pin.OUT)
=> Is the voltage is also 3.3V ?
=> Is the acceptable current draw is the same ?

@jcaron said in INPUT ADC values and OUTPUT voltage:

Note that the ADC at least is not very precise and quite noisy. Depending on your needs an external ADC may be a better idea.

Wow.
Worse or better than an arduino? Or the same order of magnitude ?

Thanks

[jcaron]

@Meric-NESSANGE https://docs.pycom.io/firmwareapi/pycom/machine/adc/

• Yes
• You have functions to get either the raw value or the voltage directly

https://docs.pycom.io/firmwareapi/pycom/machine/dac/

• setting to 1 will provide 3.3V

Note that the ADC at least is not very precise and quite noisy. Depending on your needs an external ADC may be a better idea.