Hi there,
What is the best way to measure low resistance let's say up to 20R? I originally used current source and ADC. Unfortunatelly, I want to have a few channels and don't want to use more than one current source. I tried switching by using transistors, but there is always a small current flowing that causes problems. And, when a resistance is higher than the max value - uC receives max voltage(thats good). Although, when this particular channel is off - still uC receives max V. Therefore, it cant tell me if the channels are shorted together.
I'm trying to measure the time needed for the capacitor to charge. What do you thing about it?
Or maybe I should just use a simple circuit with known resistor value?
Thank you,
N.L. B
What is the best way to measure low resistance let's say up to 20R? I originally used current source and ADC. Unfortunatelly, I want to have a few channels and don't want to use more than one current source. I tried switching by using transistors, but there is always a small current flowing that causes problems. And, when a resistance is higher than the max value - uC receives max voltage(thats good). Although, when this particular channel is off - still uC receives max V. Therefore, it cant tell me if the channels are shorted together.
I'm trying to measure the time needed for the capacitor to charge. What do you thing about it?
Or maybe I should just use a simple circuit with known resistor value?
Thank you,
N.L. B