This project started almost two years ago when the hall effect sensor was first installed underneath the engine cover. The sensor is in a TO-92 package and wire leads were soldered on. The wire was run through a hole underneath the flywheel. The sensor is held in place with a little bit of RTV. Below the installed sensor is shown along with the magnet that is present on the flywheel.

Today the sensor was connected to the Pixhawk ADC port. The wire leads were spliced onto 3 pin Hirose connector and a 10k resistor was added between the power and signal lines.

The next step is writing the software application that will read the sensor and determine the RPM.