Blackheart (PRIVATE)

Digital instrument cluster

With commercial offers, email me helimania@me.com or contact me on Drive2 https://www.drive2.ru/users/helimania/

Requires:

Raspberry PI Zero
Atmega328P with Arduino bootloader
Microchip MCP23017 port expander
1.5inch OLED display Module (if needed)
Buildroot 2018.08.3 or higher
QT 5.11
А little time and patience

Schematic

However, I did not redraw the scheme for this project, but I hope you will understand how it should look.

Arduino and Raspberry connected with only one wire TX (arduino) -> RX (raspberry) and scheme taken from here https://elinux.org/RPi_GPIO_Interface_Circuits

For raspberry external PWM sound used scheme from here https://www.tinkernut.com/2017/04/adding-audio-output-raspberry-pi-zero-tinkernut-workbench/#lightbox[10497]/2/

Arduino sketch included.

Prepare QT 5.11

Get raspbian images from here https://www.raspberrypi.org/downloads/raspbian/ and follow an official installation guide to boot it up.

[RPI]

sudo raspi-config (enable SSH, disable X windows, setup network)
sudo passwd root (setup root password)
sudo rpi-update
sudo reboot

sudo nano /etc/apt/sources.list (uncomment deb-src)
sudo apt-get update
sudo apt-get upgrade
sudo reboot

sudo apt-get build-dep qt4-x11
sudo apt-get build-dep libqt5gui5
sudo apt-get install libudev-dev libinput-dev libts-dev libxcb-xinerama0-dev libxcb-xinerama0

sudo mkdir /usr/local/qt5pi
sudo chmod -R 777 /usr/local/qt5pi

[HOST]

sudo apt-get install lib32z1 lib32ncurses5 lib32stdc++6

mkdir ~/raspi
cd ~/raspi

git clone https://github.com/raspberrypi/tools

ssh-keygen -t rsa -C pi@raspberrypi.local -N "" -f ~/.ssh/id_rsa
cat ~/.ssh/id_rsa.pub | ssh -o StrictHostKeyChecking=no pi@raspberrypi.local "mkdir -p .ssh && chmod 700 .ssh && cat >> .ssh/authorized_keys"

mkdir sysroot sysroot/usr sysroot/opt
rsync -avz pi@raspberrypi.local:/lib sysroot
rsync -avz pi@raspberrypi.local:/usr/include sysroot/usr
rsync -avz pi@raspberrypi.local:/usr/lib sysroot/usr
rsync -avz pi@raspberrypi.local:/opt/vc sysroot/opt

wget https_://raw.githubusercontent.com/riscv/riscv-poky/priv-1.10/scripts/sysroot-relativelinks.py
chmod +x sysroot-relativelinks.py
./sysroot-relativelinks.py sysroot

git clone git://code.qt.io/qt/qtbase.git -b 5.11
cd qtbase

./configure -no-gbm -no-glib -no-gstreamer -qt-xcb -no-pch -no-zlib -no-use-gold-linker -release -opengl es2 -device linux-rasp-pi-g++ -device-option CROSS_COMPILE=~/raspi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin/arm-linux-gnueabihf- -sysroot ~/raspi/sysroot -opensource -confirm-license -make libs -prefix /usr/local/qt5pi -extprefix ~/raspi/qt5pi -hostprefix ~/raspi/qt5 -v

make -j4
make install

Prepare Raspberry Pi Zero

Download Buildroot https://buildroot.org/download.html and make raspberry immage using included config and overlays.

I personally flashing image on my Mac OS with Etcher. You may download it here https://www.balena.io/etcher/ or flash image from console.

Edit wpa_supplicant.conf to set up ssid and psk for you WiFi access point.

After raspberry boot, enter two console commands:

mount -o remount, rw /
ln -s /usr/lib/libGLESv2.so /usr/lib/libGLESv2.so.2

Example for make and run application

[RPI]

mount -o remount, rw /

[HOST]

cd ~
git clone https://github.com/helimania/Blackheart.git
cd Blackheart

~/raspi/qt5/bin/qmake
make
scp Blackheart root@192.168.1.116:/root
ssh -t root@192.168.1.116 "./Blackheart"

After reboot, application runs automaticaly.

CAN bus interface

Theoretically can be used CAN bus. For this you need only TJA1050 chip.

But since the serial interface is used to transfer data to raspberry, you can use i2c or SPI interface to connect this chip to arduino, or separate RX TX lines, for transfer data to raspberry and receive data from CAN bus. Fantasy has not been canceled...

For example, CAN bus with SPI interface.

Arduino sketch for example

#include <SPI.h>
#include "mcp_can.h"
 
INT32U canId = 0x000;
 
unsigned char len = 0;
unsigned char buf[8];
char str[20];
 
void setup() {
  Serial.begin(38400);
 
  START_INIT:
 
  if(CAN_OK == CAN.begin(CAN_125KBPS)) {
    Serial.println("Initialized successfully");
  } else {
    Serial.println("Initializing is failed");
    Serial.println("Reloading...");
    delay(100);
    goto START_INIT;
  }
}
 
void loop() {
  if(CAN_MSGAVAIL == CAN.checkReceive()) {
    CAN.readMsgBuf(&len, buf);
    canId = CAN.getCanId();
    Serial.print("<");Serial.print(canId);Serial.print(",");
    for(int i = 0; i<len; i++) {
      Serial.print(buf[i]);Serial.print(",");
    }
    Serial.print(">");
    Serial.println();
  }
}

More details here https://www.14core.com/wiring-the-mcp2515-controller-area-network-can-bus-diagnostics/

cvam0000 / Blackheart