Thanks openXsensor

[raleighcoter]

Made an rpm/current sensor for my airplane for $4 and about 20 minutes of my time. Now i get pack capacity and engine run status. Commercial products to do this cost about 40 bucks. Outstanding.

[kalle123]

May I ask, what components did you use for rpm (brushless motor?) and for current (ACS xxx)?

I see a promini with some cables. Rest is your secret

[raleighcoter]

Rpm is from the CDI on my DLE30. Just a single signal wire to digital pin 8. Current is an acs712 to analog pin 2. Current sensor gets power and ground. Rpm doesn't need ground in my setup because i run an opto switch it ties ground on the engine to the radio. If not you'll need ground for the rpm connection too. A hall sensor would work too with power and ground.

[raleighcoter]

...power in goes to raw pin and you can grab 5v regulated and ground from all over the arduino

[kalle123]

Thank you for your information