Hello, for some reason my sonar sensor wont give any value other than 20cm. It is working as I have tested it on a standard arduino, any idea on how to get it to play nice with the APM?
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Double check your connections to the sonar and APM. I had this issue a while back, and it was a bad connection in my sonar cable. If you used the same wire/connector when you tested with your arduino, your cable must be fine. Try applying a voltage 0-5V to the signal pin on the oil pan and see if you get a different readout. It shows 20 cm for a 0V signal, so I would assume there is a bad solder joint on that pin, or you have some sort of problem with the oil pan. I hope this helps!