I've got an old analog (0-5ma) ammeter and want to convert it to measure 0-±5 volts, as an output for my Arduino.
I'm a programmer and my knowledge of electronics is limited. I know what components do but obviously not how to use them properly.
I tried to place some 2k (1 and 2) resistors in series with the ammeter but it doesn't work as expected. This was sortof working but is wasn't a linear movement even with a capacitor attached to + and - (+ and - come from the Arduino PWM/analog output)
I know its a ammeter so it needs current and if theres nothing asking for current there will not be any so i put a very high resistor between + and - but that didn't really change anything.
So how can i change my am meter to measure 0-5v?
This is it opened, the resistance is about 2.9k (if I measured it correctly)
Could it be microAmps?
Hope some one can help, Thanks in advance.