Sprayer Pumps for Copter

Starting with copter 3.4, there is now built-in, experimental variable rate sprayer support. Nice work!

I was curious what PWM pumps (or pump controllers?) people have been using in conjunction with this feature. Similarly interested in what spinners are readily available. Thanks!

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A parallel topic, do you think it is fairly straight forward to port the code for the sprayer to work with ArduPlane?