Universal Motorcycle Gear Indicator Based on ATtiny25

The device uses an ATtiny25 microcontroller as it introduces a new design for a universal gear indicator that can be fitted to any motorcycle.

The project consists of a main circuit that includes a 7-segment LED indicator, two Hall sensors attached to the motorcycle frame, and a small magnet placed on the gear shift lever. It operation depends entirely on the gear shift lever movement instead of connecting to speedometer and tachometer sensors, making this its main advantage. The signals of the two Hall sensors are read by the AVR ATtiny25/45/85 microcontroller while a 4026 counter/decoder outputs the current gear number to a 7-segment LED indicator. The current gear is stored in EEPROM even if the motor is turned OFF. This will be restored when the device is turned ON again.

The AVR-GCC (WinAVR) is used to write the source code which can be programmed with the default fuses using an AVR programmer such as USBTiny programmer. The default number of gears is 5 and the minimum time to pass until neutral gear is detected is 500ms, where display resets to zero. Depending on the requirements, these factors can be modified.

Rest of the project