JeT1 Engine Control Unit (ECU) software provides fuel management, ignition timing, cooling fan control for inline 4 cylinder internal combustion engines. The ECU software & hardware was originally developed around the Arduino 2560 microcontroller board but development has now moved on to 32-bit STM32 ARM Cortex based microcontrollers. The first release uses the STM32 NUCLEO G431KB microcontroller board. This provides numerous advantages over the 8-bit Arduino family, including:
- Much faster CPU speed, reduced latency and increased CPU throughput, allowing much more to be accomplished in less time and more accurate time-based functions.
- Improved ADC resolution (12-bit vs 10) and much faster conversion time.
- Many more 16 bit timers, allowing much greater resolution and accuracy in pulse timing and measurement.
- Much greater RAM capacity.
All this allows improved functionality and more complex processes to be adopted. For example, the first version of the STM32 code (version 3200.04) has a Proportional/Integral Air-Fuel Ratio controller which provides far greater accuracy and real-time control of the air-fuel ratio.
The STM32 source code is developed in the CubeMX IDE in 'C'. The code, plus configuation guide and Windows desktop / laptop application are available below. Hardware documentation can be found here but note that the ECU main board needs modifications to operate at 3.3V - further documentation will be provided on this later.
| Date | ECU Version | ECU Code | Documentation | Windows App | Remarks |
| Nov 2020 | 3200.80 | source code | Config Guide | source code | Main development is the implementation of external EEPROM for non-volatile AFR data storage. |
| May 2020 | 3200.067 |
|
Note "Limitations" section in the configuration guide. |
The original Arduino Mega 2560 microcontroller software is here:
| Date | ECU Version | ECU Code | Documentation | Windows App | Remarks |
| June 2019 | 0.8 |
See notes below. |
Final version, no longer being developed. |
Notes (known issues):
- In file "free_memory/free_memory.h" missing "extern" in declaration. Line 10 should be:
- extern int freeMemory();
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