One of the next big things to do was to create a custom made board to house some electronics on it for control of the ignition, servo motors and load cell. The 16 bit I2C plugs into the female port in the upper right to enhance the signal from the load cell. There is a relay that is hooked up to pin D12 on the Arduino Mega 2560 that will allow 12VDC to flow through the nichrome igniter in the engine and start the ignition sequence. None of the circuits were too difficult to conceive and thus allow for simple plug and play into the two Arduinos to complete test and run the engine.
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