README.md

Collect the IR data on Raspberry PI 4B

Prepare operating system and software on Raspberry PI

• download and flash Raspberry Pi OS image to the SD-Card. See details on https://www.raspberrypi.org/software/

• expand the primary partition on the SD-Card (e.g. with gparted)

• (optional) enable ssh by running touch ssh on boot partition of the SD-Card

• connect IR camera with cables to GPIOs (seehttps://www.element14.com/community/servlet/JiveServlet/showImage/102-92640-8-726998/GPIO-Pi4.png )

  • 3v3 (1st in bottom left row)
  • I2C SDA (2nd in bottom left row)
  • I2C SCL (3rd in bottom left row)
  • GND (5th in bottom left row)

• start Raspberry and either connect via ssh or use display and keyboard connected to PI

• user pi, change password to pivision

• Run commands:

sudo apt update
sudo apt upgrade

# Install required packages
sudo apt-get install -y python-smbus i2c-tools
sudo apt-get install libatlas-base-dev

cd /media/pi/data
git clone xxxxx
cd ir_vision

# Prepare virtual environment
python3 -m venv venv
. venv/bin/activate
pip3 install -r data_collection/requirement.txt

• Enable I2C. Open sudo nano /boot/config.txt and:
  • change line dtparam=i2c_arm=on to dtparam=i2c_arm=on,i2c_arm_baudrate=1000000,
  • add lines:

# Enable optical camera
start_x=1             # essential
gpu_mem=128           # at least, or maybe more if you wish
disable_camera_led=1  # optional, if you don't want the led to glow

• then reboot

• check if camera can be detected on I2c: sudo i2cdetect -y 1 at address 0x33

• for more details see:

  • https://learn.adafruit.com/adafruit-mlx90640-ir-thermal-camera/python-circuitpython
  • https://makersportal.com/blog/2020/6/8/high-resolution-thermal-camera-with-raspberry-pi-and-mlx90640

• try if the IR camera works - python ./data_collection/misc/manual_ir_test.py (one should see preview from IR camera plotted in matplotlib)

• try normal camera - raspistill -t 0

• (optional) mount pi storage in your PC for convenience

mkdir tmp; cd tmp; mkdir pi_mnt; sshfs [email protected]:/home/pi/Projects pi_mnt

Run the recording manually

. venv/bin/activate
cd data_collection/src
python main.py

# visit 0.0.0.0:8888 in a browser to see live status

Or use as service (starts as daemon):

Copy service file one time and enable service:

sudo cp ir_vision.service  /etc/systemd/system/
sudo systemctl daemon-reload
sudo systemctl enable ir_vision 

• And then use as a service with standard commands:

sudo systemctl stop ir_vision
sudo systemctl start ir_vision
sudo systemctl status ir_vision