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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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
Hi Cris,
I just remembered I had to drive a meter with Arduino too a while back, although I used an Arduino Micro, maybe the ideas are similar with Arduino Mega).
The info is here:
Sensirion Gas/Temp/Humidity Sensor Kit - Review
The code is here:
https://github.com/shabaz123/FeelWellMeter/blob/master/env-sensor.ino
I don't remember it in any detail, but line 23 in the code there defines the constant 'meter' to be pin PB5, where the meter is wired as can be seen in the diagram above.
Lines 339-344 set up the PWM mode, and this may change on Arduino Mega.
Then, whenever the meter reading needs to change, then 'meter' is just set to a different value.
For example, to make the needle swing to maximum, then wait three seconds, then swing to minimum, the following code is used (max and mmin can be calculated or just try any values for experimentally determining them, in my case they were 100 and 3500 respectively, for the 100uA meter):
