hi all
in the bargraph example
what is the value of the potentiometer,
it is not on the list of parts required
thanks
hi all
in the bargraph example
what is the value of the potentiometer,
it is not on the list of parts required
thanks
10 to 20 k linear.
As the potentiometer is basically acting as a variable voltage divider, giving out a percentage of the Vcc voltage (0 to 5 volts), the actual resistance is pretty much irrelevant.
You need it to be a small fraction of the impedance of the ADC, or you will start getting messed up results, and it really needs to be linear. Other than that, it can be pretty much anything.
The larger the value the less current draw.
I usually use 10K linear pots for this kind of thing.