Readme

This project uses a Raspberry Pi running Ubuntu Server OS with DHT22 digital temp and humidity sensor and TM1637 LED display.

This project serves as a slave DHT22 API and will have a master API.

Project trello board can be found here

You need the Trello improvements browser plugin to get story numbers.

Branches will be named "story-<story #>"

The readings will be stored in a MYSQL instance running in docker.

Install Dependencies

Docker

sudo apt install docker.io

Python

sudo apt-get install python-dev python-pip
sudo pip install wiringpi2
sudo pip install Adafruit_DHT
sudo pip install flask
pip install -U flask-cors

MySQL

To pull and run the MySQL Docker container run:

docker run --name temp-mysql -v /hdd/mysql:/var/lib/mysql -e ALLOW_EMPTY_PASSWORD=1 -d mysql/mysql-server:latest

To access MySQL DB:

docker exec -it temp-sql mysql -uroot

Now install python mysql connector

python -m pip install mysql-connector-python 

NOTE: You must MySQL v8 or above because older versions do not support ARM CPU

Setup ESP32

Install esptool:

pip install esptool

Erase esp32's flash:

esptool.py --port /dev/ttyUSB0 erase_flash

Download latest micropython firmware and flash it:

esptool.py --chip esp32 --port /dev/ttyUSB0 write_flash -z 0x1000 esp32-20180511-v1.9.4.bin

Install adafruit ampy

 pip3 install esptool adafruit-ampy

Move files in esp folder to esp Ex:

 ampy -p COM3 put src/esp/boot.py

Running

To run the slave API, launch slave_api_main.py with room/sensor name argument.

NOTE: You must run as root to get access to GPIO

sudo python slave_api_main.py office