Using arduino to adjust voltage level


My projects objective is to create a clock out of a volt meter.

I have a simple circuit which runs a 10V battery through a volt meter, displaying 10 volts.

Now, from a seperate circuit, i want to be able to dynamically change the reading on the volt meter from 10 to 0, using an arduino UNO, making it an hour display (the clock logic is not a problem, this is simply asking how i would go about dynamically changing the voltage reading).

Whats the best way to go about this?

I am a software developer touching electronics for the first time so I might just be looking in the wrong place, but i couldn't find a proper solution.

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arduino meter clock

Tom… :slight_smile:

I would use a PWM output and pass it through a low pass filter (resistor connected to grounded cap) then through a unity gain op amp circuit (- connected to output, + in, output powers meter) to power the meter. You probably will need to add a series resistor to limit the meter swing. Your schematic etc helps a lot is solving your problem. Why not start by defining the problem with specifications. What is the expected outcome. Purchase the Arduino cookbook and read it, this will give you some basics. also use the online tutorials and videos available, there are many good ones on this web site. At this point you will be able to define the problem and may have already solved it. At that point you can determine how well I did.