RaspiCar ( RC Car With 4WD)

Before we can run the code, the Raspberry Pi has to be prepared.

1.Raspberry Pi OS

The first step you will have to do is downloading an image Raspberry Pi OS. You can find this file via this link:

https://www.raspberrypi.com/software/operating-systems/

When the file is downloaded, you can write it to your sd card. This can be done via the Win32 Disk Imager or with the Raspberry Pi Imager (https://www.raspberrypi.com/software/).

After that you should configure the SD card.

Find the boot disk on the folder from the SD Card. Create a new file ssh, without extension and add ‘ip=169.254.10.1' to the end of the file and save it.

2.Connect to Raspberry Pi

When the Raspberry Pi is configured correctly, you should be able to connect with the Raspberry Pi.

Connect an internet cable from your pc to the Raspberry Pi. Open Putty and enter the ip address of the Raspberry Pi. You should be able to login with the username ‘pi' and password ‘raspberry'.

3.Configuration

Enable I2C, Serial and SPI on the Raspberry PI with:

 sudo raspi-config

Also navigate to Localisation Options and change timezone and WLAN Country.

When this is done you should reboot the Raspberry PI with

sudo reboot

Add your home wifi to the Raspberry Pi. This can be done via VNC Viewer or via the command line with putty.

If you choose to do it via Putty, you an do it with the following commands:

sudo wpa_passphrase 'Networkname' 'Password' >> /etc/wpa_supplicant wpa_supplicant.conf

wpa_cli -i wlan0 reconfigure

You can check the coonnection by requesting the ip-address (wlan0).

ifconfig

Make shure that the operatin system from Raspberry Pi is up to date by executing the following commands

sudo apt-get update 
sudo apt-get upgrade

4.Packages for python

Install the following packages:

pip install flask-cors
pip install flask-socketio
pip install mysql-connector-python
pip install gevent
pip install gevent-websocket
pip install selenium
sudo apt install chromium-chromedriver

5.Database

Install apache with the following command:

sudo apt install apache2 -y

Install MariaDB with the following command:

sudo apt install mariadb-server mariadb-client -y

Secure MariaDB with the following steps

sudo mysql_secure_installation

Enter -> Type a password -> y -> y-> y- > y

Create a MariaDB user:

sudo mysql -u root -p
create user 'USERNAME'@'localhost' identified by 'USERNAME';
grant all privileges on *.* to USERNAME@localhost;
flush privileges;
exit;

Configure MySQlWorkbench:

Start MySQLWorkBench on your pc and make a new connection.

Choose Standard TCP/IP over SSH as Connection Method

SSH Hostname:169.254.10.1

SSH Username: pi

SSH Password: raspberry

MySQL Hostname:127.0.0.1

MySQL Server Port:3306

Username: pi

Password: raspberry

7.Automaticallystarting the script up

If you want the project to automaticly start when you boot up the Raspberry Pi, you should execute the following steps.

Create a file ‘myproject.service' with the following code:

 [Unit]
Description=ProjectOne Project
After=network.target
[Service]
ExecStart=/usr/bin/python3 -u /home/pi/2021-2022-projectone-PattynRuben/backend/app.py
WorkingDirectory=/home/pi/2021-2022-projectone-PattynRuben/backend
StandardOutput=inherit
StandardError=inherit
Restart=always
User=pi 
[Install]
WantedBy=multi-user.target

Copy this file as root user to /etc/systemd/system with the command:

sudo cpmijnproject.service /etc/systemd/system/mijnproject.service

You can test the file by starting it with the following command:

sudo systemctl start myproject.service

You can stop the file with the following command:

sudo systemctl stop myproject.service

If everything works fine, you can start the script after booting up by the following command:

sudo systemctl enable myproject.service

Step 5: Programming the Backend