SkyPi

Particulate and light level monitoring with the Raspberry Pi

Details

A total of three sensors on two hardware components are used to measure:

• Particulates (pm1.0, pm2.5,pm10) - PMS5003
• Humidity, temperature, air pressure - BME280
• Light levels - SQM-LU

Air sensors are all attached to a custom-built "bonnet" for the Raspberry Pi purpose-built for Motus, using the pin headers for connection plus a daughter board for with

Light level sensor is a USB device made by UniHedron used to detect light pollution.

Installation

With internet connection, run: curl -sSL https://raw.githubusercontent.com/sensorgnome-org/enviroPi/main/install.sh | sudo bash

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Next steps

• Test miniUART (ttyS0) with PMS5003
  • Switch to pins 32/33 or something
  • Test with GPS hat plugged in
• Switch BMP/BME280 pin from 4 to 27
• Test with Cell Hat
• Add reporting to SG web interface

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Manual install

Requirements

Python virtual environment

Latest RPi OS locks down the Python environment, preventing you from installing packages into the system interpreter using Pip. For this reason, you need to use a virtual environment.

• Run this code:

  sudo apt install python3-venv
  python3 -m venv env
  source env/bin/activate
  

• Install required packages from requirements.txt

  pip install -r requirements.txt
  

Modifying services

sudo mv /home/enpi/enpi-*.yml /etc/shiftwrap/services/
sudo mv /home/enpi/*.rules /etc/udev/rules.d/
sudo mv /home/enpi/*.py /opt/enpi/
sudo mv /home/enpi/env/ /opt/enpi/env/
sudo mv /home/enpi/update.sh /opt/enpi/
sudo mv /home/enpi/enpi-*.service /etc/systemd/system/
sudo systemctl daemon-reload
sudo systemctl enable enpi-air
sudo systemctl start enpi-air 

• See if modifications worked by checking the status: sudo systemctl status enpi-air

sudo systemctl daemon-reload
sudo systemctl restart enpi-air
sudo systemctl status enpi-air

journalctl -u enpi -n 50 --no-pager

• Make log folder if it doesn't exist

sudo mkdir -p /var/log/enpi
sudo chown ampi:ampi /var/log/enpi
sudo chmod 755 /var/log/enpi

• update udev rules

sudo mv /home/enpi/*.rules /etc/udev/rules.d/
sudo udevadm control --reload-rules
sudo udevadm trigger

PMS5003

Uses UART interface which is disabled by default. Steps to make it work:

• Edit /boot/firmware/config.txt and add line enable_uart=1

• Enter raspi-config and select Interface Options --> Serial Port and answer the questions:

  • Login shell over serial --> NO
  • Enable serial hardware --> YES

• Reboot

• Notes: might try to reconfigure uart to use miniuart (ttyS0) so that it's compatible with GPS HAT

  • /boot/config.txt -> dtoverlay=uart1,txd1_pin=32,rxd1_pin=33

BME280

• Enter raspi-config and select Interface Options --> I2C --> Enable
• Reboot

SQM-LU