Hi, I would be interested in any suggestions from the experienced contributors here for a way to measure voltages higher than the voltage my microcontroller pins are rated for. Basically I need to measure the potential difference between +10V and +6.7V. The microcontroller has a +3.3V Vdd and has a maximum pin voltage of Vdd+0.3V, with a maximum pin current of 25mA.
The application is measuring a temperature sensor which is essentially a thermistor whose resistance changes from 200R to 500R depending on the temperature. I have been using a voltage divider in order to get the voltage range to within what the microcontroller needs for its Vref, however I still have the problem of the voltage offset.
I am able to measure a differential input using my microcontroller, I would just like to understand better how to connect the sensor in order to do this. I'm sure there's a simple way but I haven't encountered this type of problem before and I want to make sure I have explored all the angles. Any advice very welcome!
The application is measuring a temperature sensor which is essentially a thermistor whose resistance changes from 200R to 500R depending on the temperature. I have been using a voltage divider in order to get the voltage range to within what the microcontroller needs for its Vref, however I still have the problem of the voltage offset.
I am able to measure a differential input using my microcontroller, I would just like to understand better how to connect the sensor in order to do this. I'm sure there's a simple way but I haven't encountered this type of problem before and I want to make sure I have explored all the angles. Any advice very welcome!