Originally Posted by
hyamesto
Yeah, thatīs right.
I have between 20k and 30k.
I use two trimpots, but replace the 20k in the graphic with a 2,2k resistor (the most standard near value, my trimpot is set to max value)
Maybe can be put more resistor, but with this value works full resolution).
Think D'ansorval meter like "a sort of LED", no matter the volts, but yes the current (amper).
However, with a 10k works too, but no full resolution (195 steps), and in my Arduino, the power Led indicator, (not the pin13 LED) changes brightness in sync with the max values of PWM output.
(The power led in my ArduinoMega is near of reset button and in front of communication pin RX2, or digital pin 17, and ever is on when the arduino is powered by usb or external battery)
This is a sign of elevated amper consumption.
Measures: with the multimeter in series connection, measuring 2,5mA at full scale.
With 30K, i canīt not measure current, because itīs too low for my multimeter range of current. Needle movement is smoother like the real life VOR. (full resolution)
If I reduce to 10K, there is a 0,5 mA reading on the multimeter, and the movement of the needle is more sharp, and goes to fast from one extreme to other (loose resolution).
Regards.
Horacio.