2nd KHU (Kyung Hee University) College of Electronics and Information Engineering Creative Innovation Project

Team Name: My Life is NG(New Generation)

Contest Introduction: Container-Based Embedded System Virtualization

We are building embedded system virtualization using Docker containers.

We aim to implement a single Dockerfile script that is compatible with various hardware platforms, allowing applications to run in containers.

Ultimately, we plan to present a prototype for open-source and embedded system virtualization.

We already pushed our own Docker Image on Docker Hub using docker buildx build command. You can pull the image:

docker pull includekhs/final:6.0

Used IoT Devices (Orange Pi Zero, Raspberry Pi 4, Orange Pi Zero 3):

• Raspberry Pi 4 (Broadcom BCM2711) $~$ : Sensor(DHT11) application, publisher
• Orange Pi Zero (Allwinner H2+) $~$ : Sensor(DHT22) application, publisher
• Orange Pi Zero 3 (Allwinner H618) $~$ : MQTT broker and subscriber
  
  

Used Libraries:

pyA20==0.2.1
paho-mqtt==1.6.1
Adafruit_DHT==1.4.0
sqlite3=3.40.1

Alert

After you entered into container, you should set the environment variable which specify the mqtt broker ip address(choose between 2 solutions):

• Solution 1. Setting export BROKER={ip_address}
• Solution 2. Add some layer ENV BROKER={ip_address} to Dockerfile

Raspberry pi 4

To use the DHT sensor on Raspberry Pi 4, GPIO control is required. We used the Adafruit_DHT library for this purpose.

• rpi_sensor.py reads temperature and humidity data from the sensor.
• rpi_mqtt.py sends the temperature and humidity data read from the sensor to the MQTT broker (Orange Pi Zero 3) using the paho-mqtt library.

Source code related to this can be easily found and implemented as there are various resources available.

Orangepi zero

To use the DHT sensor on Orange Pi Zero, GPIO control is required. We used open-source pyA20 resources from GitHub.

1. DHT22 sensor reference: https://github.com/jingl3s/DHT11-DHT22-Python-library-Orange-PI.git
2. pyA20 reference: https://github.com/LinhDNguyen/orangepi_zero_gpio.git

• opi_sensor.py reads temperature and humidity data from the sensor.

• opi_mqtt.py sends the temperature and humidity data read from the sensor to the MQTT broker (Orange Pi Zero 3) using the paho-mqtt library.

• /DHT11-DHT22-Python-library-Orange-PI/dht.py reads temperature and humidity data from the DHT22 sensor and contains helper functions for data validation.

• /orangepi_zero_gpio is an installation file for the pyA20 library.

Orangepi zero3 (UPDATED: 23/10/06)

Orange Pi Zero 3 operates as an MQTT broker and receives temperature/humidity data from Orange Pi Zero and Raspberry Pi 4.

• mqtt_broker.py receives the temperature and humidity data from Orange pi Zero and Raspberry pi 4.
  
  

UPDATED: We have used sqlite3 database library for using docker volume. And we added init_db.py file which role is initializing the database configuration.

UPDATED: Also, mqtt_broker.py has INSERT sql command to operate database