This is yet again another attempt to fly a model rocket without fins using long burn motors. The following repository is the firmware for the board.
I am using the Arduino PID library an STM32F103C board (you can use an arduino Nano) and a 3D printer to print the 24mm motor gimbal It uses a bluetooth module (HC-05, HC-06 etc ...)to communicate with an Android device
Use it with my Gimbal console application https://github.com/bdureau/MotorGimbalConsole
I also have another version with the Bosch BNO055 sensor which is a lot less complex https://github.com/bdureau/RocketMotorPIDGimbal_bno055/