The Speeduino project offers a fantastic open-source Engine Control Unit (ECU) for automotive enthusiasts. However, integrating it with external modules and diagnostic systems can present challenges. A bridge design emerges as a solution, streamlining communication and expanding Speeduino’s capabilities, particularly concerning OBD2 connectivity.
This bridge acts as a central hub, simplifying the interaction between Speeduino, TunerStudio (TS), and external Input/Output (IO) modules. Instead of direct pass-through programming to external boards via TS, the bridge intercepts and manages communication. It treats Speeduino itself as an IO module, connecting to TS and routing all external IO setup communications, including those for Speeduino, through its system. This approach significantly reduces the processing load on the Speeduino ECU.
Functionally, envision the bridge as a network router, intelligently directing data flow between different modules. It can translate communication between modules using varying languages or formats, ensuring seamless data exchange across the network. Currently implemented using a Mega platform with SPI CAN modules, the bridge incorporates a Bluetooth/USB link for TS connectivity and a serial connection dedicated to Speeduino.
Recent development efforts have focused on incorporating OBD2 communication via one of the CAN modules. This addition paves the way for future diagnostic capabilities, leveraging readily available OBD2 tools and standards. Furthermore, support for J1850 PWM has been integrated to accommodate interfaces like Jaguar modules, increasing the versatility of the system for diverse automotive applications.
While still under development, the aim is to release a functional version of this bridge design. This innovation promises to simplify Speeduino implementations, enhance diagnostic potential through OBD2, and create a more robust and versatile engine management system for custom automotive projects.
