More about project (in Polish): https://itcrowd.net.pl/devblog-1-czym-jest-ubc-jak-dziala-i-plany-na-rozwoj/
Known issue is that avr-gcc for Windows doesn't recognize the -Os flag so it won't compile due to large output file size.
I won't try to make it work in the future, Windows doesn't concern me at all. But if someone has an idea, what should we do with that fact - go ahead.
The other, simpler solution is to just use WSL
If you're using usbasp programmer, make sure that you've made right connections to MISO, MOSI, SCK and RESET pins.
Also you HAVE TO use pairs of capcitors (100 nF + 2-40 uF) for the filtering of the power supply output. Make sure that analog section of the AVR is powered up, too.
Don't forget to use pull-up resistor for PC6 aka RESET pin.
You also need to intercept and read fuel injector pulse and VSS signal from your car. Without that UBC cannot work.
Default pins on Atmega 328P for reading user's input are PD6, PD7 and PB0.
UBC is designed to work with 8 MHz internal oscillator of Atmega 328P.
To get it work with your car, you need to count VSS pulses and divide known distance by them, and know how much liters of fuel your injector is injecting in one second.
For the VSS you need to be in the calibration mode. On the first screen press and hold "FUN" button for 6 seconds. Then you're going to see three lines:
40 0
41 0
56 1Line 40 is telling you how much pulses from the VSS it registered.
Line 41 is counting all overflows (if there were any).
Line 56 is number of all fuel injectors.
To calibrate the device, you need to drive exactly 10 kilometeres. The more precise you are, the better.
Here are two examples, both are correct:
40 42627
41 0
56 640 12317
41 3
56 4But if you already know the correct values, you can enter them by hand.
To do so press and hold "FUN" button, then you can add 500 pulses by pressing "NEXT" button or substract 500 pulses by pressing "PREV" button.
Then release all the buttons and start pressing "FUN" button until the number of injectors is on the desired level. After all of that press "NEXT" to proceed to the next screen.
For the fuel injector I read the datasheet and searched for the cc/min value.
In my case injectors can inject 149.8 cc/min, but in the calibration mode we can add or substract only by 0.5. So, the closest value would be 150 cc/min.
On the calibration screen you are going to see two lines:
50 100.0
55 .0Line 50 is the cc/min value.
Line 55 is the divide factor for the fuel left in tank, whe you use float to measure it.
The value is calculated using simple formula:
divideFactor = 1024/maxTankCap
So fo the 68 liters tank it would be ~15.
First you need to press and hold "FUN" button, then you can add 0.5 cc/min by pressing "NEXT" button or substract 0.5 cc/min by pressing "PREV" button.
Then release all the buttons and start pressing "FUN" button until the divide factor is on the desired level.
Here are two examples, both are correct:
50 150.0
55 .550 195.5
55 22Press "NEXT" button to save all the calibration data and then restart the device.
You can use PC6 pin for direct reading from the float in your fuel tank and then calibrate the output with the potentiometer, or you can enter the value by hand.
To do so navigate to the last screen, press and hold "FUN" button and then you can add 0.5 liter of fuel by pressing "NEXT" or substract 0.5 liter of fuel by pressing "PREV".
To clear data on the current screen, press and hold "FUN" button for 3 seconds.
To access "secret menu" press and hold "FUN" button for 1 second on one of the three screens.
sudo apt update
sudo apt install avr-gcc avr-libc make
git clone https://github.com/Regeneric/universal-board-computer.git
cd universal-board-computer/
# To just compile
make
# To compile and flash
make flashsudo pacman -Syu
sudo pacman -S avr-gcc avr-libc make
git clone https://github.com/Regeneric/universal-board-computer.git
cd universal-board-computer/
# To just compile
make
# To compile and flash
make flash