epd-aquams-electronics

Setup On-The-Air Update for Micropython ESP32

On The Air Update for Micropython ESP32 using Github repository on Raspberrypi http server.

Prerequisites

• Must have a github account
• Have created github personal access token

Create a config.json file

1. Follow the config-sample.json
2. Replace the details with your details
3. create a folder /home/pi/file_server/ESP32

Setup Python Virtual Environment

# Create a pip virtual environment
python -m venv venv

# Activate the virtual environment
source /venv/bin/activate

# Install required libaries
pip install -r requirements.txt

Run on node-red for every 10 minutes

# 1. Add inject node interval 10 minutes

# 2. Add this command into a script node
cd development/epd-aquams-electronics/ && bash run.sh

Setup MicroPython for ESP32 or ESP8266

Prerequisites

• For Windows must install CP210x USB to UART Bridge

flash the micropython

1. Download the latest Micropython Firmware: https://micropython.org/download/esp32/
2. For easy flash install Thonny IDE.
3. Open Thonny IDE Tools > Interpreter.
4. Choose the MicroPython ESP32 as interpreter.
5. Choose port that your ESP32 connected to.
6. Click Install or update firmware at the bottom right.
7. Choose port that your ESP32 connected to.
8. Browse the firmware that you download.
9. Click install. if its error, check your thonny IDE if its access sudo/administrator privilege.

Testing the MicroPython

1. Open Thonny IDE make sure the intrepreter is Micropython ESP32.
2. Create new file named main.py and write a simple python print hello world code.
3. Save it choose on MicroPython Device.
4. And run the script on Thonny IDE. We will see the hello world is displayed on terminal thats mean the MicroPython is successfully installed.

MQTT

Installing MQTT Client

• We were follow this tutorials for installing MQTT client: https://randomnerdtutorials.com/micropython-mqtt-esp32-esp8266/

Humidity and Temperature sensors DHT11

1. reference here: https://randomnerdtutorials.com/esp32-esp8266-dht11-dht22-micropython-temperature-humidity-sensor/

Static IP address

• IP address has set to static to prevent IP address from conflict between ESP32.

1. CO = 192.168.0.120
2. DHT22 = 192.168.0.121
3. NO2 = 192.168.0.122
4. SO2 = 192.168.0.123
5. PM2.5 = 192.168.0.124
6. O3 = 192.168.0.125

Sensors Unit Types

	gasType	Unit	Concentration	Voltage	Temperature	Range
	CO	ppm	float	float	float	0-1000
	SO2	ppm	float	float	float	0-20
	NO2	ppm	float	float	float	0-20
	O3	ppm	float	float	float	0-10
	Temp_C	℃	float	float	float	-40-80
	Temp_F	℉	float	float	float	40-176
	Humidity	%RH	float	float	float	0-100
	PM2.5	µg/m³	float	-	-	0-1000
	PM10	µg/m³	float	-	-	0-1000

The Architectures: