- #1
Rx7man
- 425
- 189
I'm working on an Arduino project to read automotive battery voltage,.. I could use a simple resistor divider circuit, but I'd lose a lot of resolution (you aren't going to see <8V very often)..
Could anyone take a look at this and tell me if it's a reasonable method?..
Channel A (Blue) is 5V/div
Channel C (Red) is 10V/div
Frequency is 1khz, which is plenty fast enough for what I need
It seems to have good linearity from 10-20V, I will use a multiturn trimpot for R3, 1/4W metal film resistor for R1
It should give me a resolution of about .015V in the working range, I'm fine with that.
Is there anything I'm missing that could come back and bite me in the arse?
Could anyone take a look at this and tell me if it's a reasonable method?..
Channel A (Blue) is 5V/div
Channel C (Red) is 10V/div
Frequency is 1khz, which is plenty fast enough for what I need
It seems to have good linearity from 10-20V, I will use a multiturn trimpot for R3, 1/4W metal film resistor for R1
It should give me a resolution of about .015V in the working range, I'm fine with that.
Is there anything I'm missing that could come back and bite me in the arse?