In the photo the top line is a counter ramping FRQA from 3.3 down to 0 in 512 steps feeding a comparator. Second line is the comparator output design the Prop. Third line is a BLDC motor driver current amp output. The output is scaled to around .8V running the motor at 1/2 speed under no load. This gives headroom for max load. The output is rather noisy and I’d like to first see how to make that a lot smoother. I have a 1uf on the output of the sense amp connected on the motor driver shunt and also a 4.7uf on the low pass filter pin on the AD628 sense amp. Still I’d like to see a smoother signal. Ideas? I got in a 12 bit ADC today ADS1015 I2C as there are no pins for SPI. I will see if I can get a finer resolution for trip points in over-current vs the comparator method. The comparator method works perfectly on an existing system(higher voyage swing under stress) but the new system has a lot higher gear ratio of 75:1 and it is far more difficult to create a trip condition if the motor is under unusual friction so that’s why I’m trying to use a better method of detection with tighter trip threshold since with the high ration there is a much lower current output voltage swing, the motor>gbox can do damage before the current trips. So smoother current measurement output and finer detection resolution is the goal for today.