BM8
New Member
Hi all,
I need some help with a certain digital voltmeter circuit design. I should start by saying that I’m new to electronics so any detailed explanation would be highly appreciated.
I’m trying to make a circuit to measure voltage from 2 DC sources in series, using 1 microcontroller. Here is a sketch of the circuit that I'm trying to complete.
I have some concerns:
I need some help with a certain digital voltmeter circuit design. I should start by saying that I’m new to electronics so any detailed explanation would be highly appreciated.
I’m trying to make a circuit to measure voltage from 2 DC sources in series, using 1 microcontroller. Here is a sketch of the circuit that I'm trying to complete.
I have some concerns:
- Where do I connect the grounds? Grounds for both DC sourcs are different so I can’t connect them both to the same ground as the microcontroller. And by the way, does the MCU have a ground pin? If yes what do I connect to it GRN1, GRN2, GRN3, or all?
- I have a doubt about the protection of a 5V microcontroller with the voltage dividers. Are they well sized for both batteries? Specially for DC2, because the voltage in the circuit increases from DC1 to DC2.
- Is it possible to take measurements with only one oscillator or do I need a second one?
- Is a pic microconntroller suitable for this application? Other propositions?
- Any other recommendations?