Hello All,
I'm working on a project which uses a ATX power supply. So I can only input up to 12V.
I have a current regualtor (fed by a step-up converter) connected to a variable resistor. I'm trying to measure the resistence using an Arduino ADC.
The problem is at high resistence the voltage is ~17V, so I need to attenuate is to match the 5V limitation of the Arduino.
Thought of a buffer but because I can only feed 12V it can't copy out 17V. What would be the best solution? A simple resistor voltage divider isn't accurate enough for the range of resistences.
Appreciate any help
I'm working on a project which uses a ATX power supply. So I can only input up to 12V.
I have a current regualtor (fed by a step-up converter) connected to a variable resistor. I'm trying to measure the resistence using an Arduino ADC.
The problem is at high resistence the voltage is ~17V, so I need to attenuate is to match the 5V limitation of the Arduino.
Thought of a buffer but because I can only feed 12V it can't copy out 17V. What would be the best solution? A simple resistor voltage divider isn't accurate enough for the range of resistences.
Appreciate any help