It’s taken a couple years but now it works and it won’t cost you an arm and leg. View the readme for the parts list.
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Looks super interesting! Any real world experience on how long those solenoids will last in a chemical environment?
Sorry to say, I have no Idea. But the price is right 
Thats cool! Looks like it does 24 nozzles any idea if it will do more in tye future? Also be neat to see how its all setup if someone has put one together.
This is the development platform. 1’st Pic is the boom, one driver per valve as close to valve as you can.
You can see the pressure sensor just behind the gauge on the galvanized fittings. Need to get brass instead of the galvanized pipe before spring. The square box sits on top of the ball valve. I’ve got the cytron in there. Just behind the ball valve you can just make out part if the flow meter.
Perf board with the Machine Teensy installed. The other long set is for Panda Teensy and a place for the F9 and BNO. The original 2X steer board is underneath and the whole the whole thing stuffs into what’s suppose to be a tool box.
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You wanted more valves? Here’s 64, 32 on the Teensy and another 32 using 2 mcp23017 extenders.
Here’s how to set them up. Click the choose button lower left.
Github has been updated with new teensy code and PCB.
Like to see this running. Could end up being next winter project on spra-coupe.
We just had a foot of snow so I won’t be using it any time soon. I will run this next season, just on my 3 valve orchard sprayer. I’ll get some video and post. If it runs on 3 valves it’ll run on all 64. Each pin that is “on” goes thru the loop, can be 1 valve or 64.
I happened on a chart showing the seal/gasket material to use with different ag chemicals.
Googled what material is the gasket in the adafruit 997 valves and got EDPM as the answer. These inexpensive valves may be better than expected.
Would this drive factory aim pwm nozzles?