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Ask an Expert Forum Help -> generate 0 - 50mV dc with arduino
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  • arduino mega 2560
  • spi
  • 50mv output
  • dc
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Help -> generate 0 - 50mV dc with arduino

phoenixcomm
phoenixcomm over 4 years ago

Is there a way I can generate 0 to 50mV for a meter (dc most likely) from an Arduino Mega?? Any thoughts would be appreciated.

I need two of the sources. so the cheaper the better.

~~Cris

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  • michaelkellett
    michaelkellett over 4 years ago in reply to dougw +6
    The capacitor value may not be ideal. The time constant of the RC filter is 10us as drawn. With a PWM frequency of 64kHz (about as fast as an Arduino can go) this will make a lot of ripple. The ripple…
  • dougw
    dougw over 4 years ago +5
    The analogWrite instruction uses PWM and a resistor and capacitor on the pin to generate an analog voltage: https://www.instructables.com/Arduino-RC-Circuit-PWM-to-analog-DC/ The Mega can have 14 PWM pins…
  • Andrew J
    Andrew J over 4 years ago +5
    You're probably aware of this Chris, but it may be worth stating anyway. An IO pin is absolute maximum 40mA but recommended at 20mA. Additionally, there is an overall maximum current draw across all pins…
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  • Andrew J
    Andrew J over 4 years ago

    You're probably aware of this Chris, but it may be worth stating anyway.  An IO pin is absolute maximum 40mA but recommended at 20mA.  Additionally, there is an overall maximum current draw across all pins, see note 4 on page 356 of the datasheet.

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  • Andrew J
    Andrew J over 4 years ago

    You're probably aware of this Chris, but it may be worth stating anyway.  An IO pin is absolute maximum 40mA but recommended at 20mA.  Additionally, there is an overall maximum current draw across all pins, see note 4 on page 356 of the datasheet.

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