Rabbit ECU RA1 Description The RA1 ECU is the original Rabbit ECU. It is comprised of the Rabbit ECU V1.3 PCB, and an Arduino Due controller. This is a basic ECU designed for cable throttle engines that need simple I/O such as relays. It is an ideal piggy-back ECU where fuel and ignition control is needed, but the OEM ECU is left for all other control. Inputs The RA1 ECU has 8 analog inputs, 2 Hall Effect/Optical/Magnetic Reluctor inputs and CAN bus. 4 analog inputs have internal pull-up resistors. One of the remaining analog inputs is reserved for battery voltage measurement. Software Input Options The software options for the inputs are: Crank Position Sensor Cam Position Sensor Air Mass Meter (frequency) Air Mass Meter (analog) Coolant Temperature Air Temperature Battery Voltage Throttle Position Sensor Manifold pressure Sensor External Lambda Device Input Outputs The RA1 has 4 saturated injector outputs, 4 x 12V motor driver/igniter signal outputs, 8 relay drivers, 2 x 12V high-side drivers, oxygen sensor heater drive and CAN bus. Software Output Options The timed output (injector and motor/igniter) software options are: injection ignition stepper motor drive The relay and high-side driver output software options are: logic output (e.g. TPS > 70%) thermo-fan relay fuel pump relay Software The RA1 Windows software is MAP-MATE found here in source code and installer form. MDAC MAP-MATE GitHub Project Source Code MDAC MAP-MATE V184.108.40.206 Setup Password “mdac” MDAC-MAP-MATE V220.127.116.11 Setup Password “mdac” The RA1 Arduino firmware is found here in source code, see firmware below for the hex/bin file. Firmware The latest firmware and accompanying A2L file can be found at the application packs page. The latest is DUE-Pack-2NR-FE-07022022.zip. This pack is set up for 2NR-FE but you can overwrite with a calibration file customized for your engine. Please take a look at the README file to install the files in their correct locations. You can point MAP-MATE to the correct GUI layout and A2L files in the settings menu. Also, you can edit the configuration file found at c:\MDAC\ECUHost\Config with updated paths to the A2L and GUI layout XML files. Hardware The Rabbit ECU V1.3 PCB schematic files are as follows: 1. Main PCB 2. Crank Cam Multi Interface 3. Wide Band Oxygen Sensor 4. Injectors 5. Saturated Injector Driver 7. Motor Driver 8. Motors 9. Relay Drivers 10. Relay Driver 11. Analog Inputs 12. High Side Drivers 14. CAN Bus 15. Power Buy Rabbit ECU RA1 You can purchase the Rabbit ECU Arduino Complete (RA1) kit here at Tindie.