• code is based on:
  • https://github.com/Seeed-Studio/grove.py
  • https://community.thingspeak.com/tutorials/update-a-thingspeak-channel-using-mqtt-on-a-raspberry-pi/

1. sudo apt install fish
2. chsch
3. sudo apt install python3-paho-mqtt python3-flask python3-pip python-pip python3-grove-py
4. curl -sL https://github.com/Seeed-Studio/grove.py/raw/master/install.sh | sudo bash -s -
5. connect headers (pins) as specified
6. move service files sudo cp run*.service /lib/systemd/system/

The Raspi1 is connected to 2 GroveUltrasonicRanger, a buzzer and a led.

1. Connect the GroveUltrasonicRanger to D5 & D16
2. Connect the buzzer to digital port 6
3. Connect led to digital port 17
4. ssh pi@raspi1
5. run sudo systemctl enable run1.service && sudo systemctl start run1.service

You can change this default values underneath in run1.py trigger_distance = 120 (trigger distance in centimeters) time_a = datetime.time(22, 0) time_b = datetime.time(5, 00) delay = 0.1

Code for Raspi1 under Raspi1 service file:

The Raspi2 is connected to a buzzer and a led.

1. Connect the button to D5
2. Connect the buzzer to digital port 6
3. Connect led to D16
4. ssh pi@raspi2
5. run sudo systemctl enable run2.service && sudo systemctl start run2.service

Code for Raspi2 under Raspi2 service file:

Configure both Raspis to be connected to the same network. For low latency communication it is recommended to connect to the same access point. Use for instance wpa_supplicant.conf on both Raspis.

• https://thingspeak.com/channels/931380

Presentation can be found under