I’m having a problem with a servo which only intermittently responds. The servo is powered by a separate 6V UBEC (not connected to the servo rail). I’ve measured the PWM signal voltage, and it seems to be very low (3.1-3.4V), so I think this low voltage is the issue.
I’ve tried to add an IC buffer (74HC14N Hex Schmitt IC) to the PWM output on the Navio2 servo rail, in order to lift the voltage of the PWM signal to 5V (presumably what it should be?); however when the buffer circuit is connected to the PWM output pin, no PWM signal is sent by the Navio2. Could this be because the Navio2 is detecting an impedance mismatch between the buffer input and the PWM output, and then shutting down?
N.B. I’ve connected the power for the IC to the Navio2 rail, and the voltage across the connected IC circuit is showing 5V, so the powering of the IC seems to be ok.
Thanks for any help.