lowpowermcu
Junior Member level 2
Hi all,
I am performing humidity measurement using the HS1101 sensor. The idea of measuring the humidity is charging anf decharging the sensor(capacitance). Please look at the link
https://www.pic_examples.byethost3.com/capacitance_meter.html
As it is written in the link above, the solution is based on a timer which charges/decharges the capacitance and a comparator which catch the response time. This solution seems OK when measuring µF capacitance.
Now in my application I am measrung the capacitance of the HS1101 sensor which changes from 160 pF to 200 pF so I am strugling to get better accuracy:
I understand for a comparator there is a propagation delay that I should consider in my computations. But the question is:
Is the propagation delay constant for a given comparator? In other words, If I connect a 100 pF capacitance and I measure the prpagation delay did I find it equal to the case where I connect a 200 pF?
Sorry for being long and thank you in advance.
MCU Lüfter
I am performing humidity measurement using the HS1101 sensor. The idea of measuring the humidity is charging anf decharging the sensor(capacitance). Please look at the link
https://www.pic_examples.byethost3.com/capacitance_meter.html
As it is written in the link above, the solution is based on a timer which charges/decharges the capacitance and a comparator which catch the response time. This solution seems OK when measuring µF capacitance.
Now in my application I am measrung the capacitance of the HS1101 sensor which changes from 160 pF to 200 pF so I am strugling to get better accuracy:
I understand for a comparator there is a propagation delay that I should consider in my computations. But the question is:
Is the propagation delay constant for a given comparator? In other words, If I connect a 100 pF capacitance and I measure the prpagation delay did I find it equal to the case where I connect a 200 pF?
Sorry for being long and thank you in advance.
MCU Lüfter