Main objective is to create a clock from volt meter. But due to unavailability of 3v or 5v analog voltmeter in the market, i have to create one.
I am using Arduino UNO, and i made a custom coil of 150 turns of copper wire of 40 gauge to create a 3 to 5v DC analog volt meter with a small magnet. I can see my custom voltmeter works perfectly with external power sources but with arduino, it moves pointer but not good enough. i think due to low current from output pin.
However, i am going to check pwm also for more knowledge.
If with arduino or with any other hardware, somehow able to supply 100 to 400ma current with 3.3v then i think I can proceed.
I am increasing voltage from 0 to 3.3v using analogWrite method of my program. So at 0 my custom voltmeter pointer remains a 0 but at 3.3v the pointer is not moving to highest due to low current. However, when i use 3v batteries it works perfectly. I am sorry, providing such abstract information as per my best knowledge of electronics.