Hi,
I would like to make some projects with analog volt/ ammeter. I know that i can drive a 5V voltmeter directly off PWM+gnd pins. I have seen ammeters used with PWM+gnd as well, but with an added resistor in series. For a 50mA meter it should be ~1k ohms. What is the maximum feasible ammeter I could control? And is there any way to calculate/ guess the resistor value?
Thank you
7 posts - 4 participants