Hi,
I'm trying to read some sensors[QTR-8RC - https://www.pololu.com/docs/0J13/2] and then i got on and dead end...
Need some advice, the sensors need a 10us pulse for charging some capacitance, and the we read the cap discharge. I generate the pulses with a PWM and i can see the waveforms on an oscilloscope and they display correctly but only if i put the pin on "Open drain, drives high"
Then I try to get the cap discharge signal to a comparator to get a pulse width proportional to sensor measurement.
Well.. after days of reading, i think i need another "pin driving" so i can "read" the signal with the comparator.
Came here to seek some advice, or if i can get another way of achieve the measurement of this sensors.
Thank you, and sorry to bother you!
