There was some discussion about this on the forum a while back. https://discourse.agopengps.com/t/impulses-per-100m. It’s not a PWM signal. It’s a square wave where the frequency is proportional to the speed. Most sprayer controllers can be calibrated to specify how many pulses there are per some distance. The trick is to get an arduino or similar microcrontroller to generate those pulses. Probably could use some interrupt-driven code to pulse a digital output pin. Some people have talked about using a “Tone” library.
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