weightausend Does someone know how many sensors/potentiometers can an expanded Bela handle?
In what sense?
weightausend Do I need an external power supply or the power supplied by the BeagleBone is enough?
There is not much current going through the FSR and associated resistor, therefore this is not going to have any serious impact on the current drawn by the system.
Note that if you run out of inputs, one common approach for handling
k*N inputs when you have only
N analog inputs, is to wire up the sensors so that
k of them are in parallel, then power up
N sensors at a time (e.g.: each powered up by a different analog out or GPIO pin), reading then the
k times, each with a different group of sensors powered up: the
N values you read for each block will be corresponding to the
kth group of sensors, thus effectively multiplexing the inputs without the need for an external multiplexer.