Sensors Dashboard (MQTT Raspberry PI+ESP32+FastHTML)

This guide explains how to set up an ESP32 microcontroller with an LM35 temperature sensor to send real-time data via MQTT to a Raspberry Pi running a Mosquitto broker. The data is then visualized using a sensor dashboard with an interactive UI. We'll walk through: Setting up Mosquitto on a Raspberry Pi Configuring the ESP32 to send sensor data via MQTT Deploying a real-time web-based dashboard for visualization 1️⃣ Install Mosquitto on Raspberry Pi (Raspbian) Run the following commands to install Mosquitto: sudo apt update -y sudo apt install mosquitto 2️⃣ Configure Mosquitto Broker Edit the Mosquitto configuration file: sudo vi /etc/mosquitto/mosquitto.conf Copy and paste the following configuration: pid_file /run/mosquitto/mosquitto.pid persistence true persistence_location /var/lib/mosquitto/ log_dest file /var/log/mosquitto/mosquitto.log include_dir /etc/mosquitto/conf.d allow_anonymous false # Change to 'true' for public connections password_file /etc/mosquitto/passwd listener 1883 0.0.0.0 # Allow binding to the network Save and exit, then restart Mosquitto: sudo systemctl restart mosquitto 3️⃣ Enable and Start Mosquitto sudo systemctl enable mosquitto sudo systemctl start mosquitto 4️⃣ (Optional) Set a Username and Password If allow_anonymous false is set, create a username and password: sudo mosquitto_passwd -c /etc/mosquitto/passwd myUsername Restart Mosquitto: sudo systemctl restart mosquitto 5️⃣ Test the MQTT Server Install Mosquitto Clients sudo apt install mosquitto-clients Publish a Message Without authentication: mosquitto_pub -h localhost -t "test/topic" -m "Hello, Raspberry Pi!" With authentication: mosquitto_pub -h localhost -u "myUser" -P "myPassword" -t "test/topic" -m "Hello, Raspberry Pi!" Subscribe to a Topic Without authentication: mosquitto_sub -h localhost -t "test/topic" With authentication: mosquitto_sub -h localhost -u "myUser" -P "myPassword" -t "test/topic" Tip: For better performance, set a static IP on your Raspberry Pi:

Feb 7, 2025 - 08:22

Sensors Dashboard (MQTT Raspberry PI+ESP32+FastHTML)

This guide explains how to set up an ESP32 microcontroller with an LM35 temperature sensor to send real-time data via MQTT to a Raspberry Pi running a Mosquitto broker. The data is then visualized using a sensor dashboard with an interactive UI.

We'll walk through:

Setting up Mosquitto on a Raspberry Pi
Configuring the ESP32 to send sensor data via MQTT
Deploying a real-time web-based dashboard for visualization

1️⃣ Install Mosquitto on Raspberry Pi (Raspbian)

Run the following commands to install Mosquitto:

sudo apt update -y
sudo apt install mosquitto

2️⃣ Configure Mosquitto Broker

Edit the Mosquitto configuration file:

sudo vi /etc/mosquitto/mosquitto.conf

Copy and paste the following configuration:

pid_file /run/mosquitto/mosquitto.pid

persistence true
persistence_location /var/lib/mosquitto/

log_dest file /var/log/mosquitto/mosquitto.log

include_dir /etc/mosquitto/conf.d

allow_anonymous false  # Change to 'true' for public connections
password_file /etc/mosquitto/passwd

listener 1883 0.0.0.0  # Allow binding to the network

Save and exit, then restart Mosquitto:

sudo systemctl restart mosquitto

3️⃣ Enable and Start Mosquitto

sudo systemctl enable mosquitto
sudo systemctl start mosquitto

4️⃣ (Optional) Set a Username and Password

If allow_anonymous false is set, create a username and password:

sudo mosquitto_passwd -c /etc/mosquitto/passwd myUsername

Restart Mosquitto:

sudo systemctl restart mosquitto

5️⃣ Test the MQTT Server

Install Mosquitto Clients

sudo apt install mosquitto-clients

Publish a Message

Without authentication:

mosquitto_pub -h localhost -t "test/topic" -m "Hello, Raspberry Pi!"

With authentication:

mosquitto_pub -h localhost -u "myUser" -P "myPassword" -t "test/topic" -m "Hello, Raspberry Pi!"

Subscribe to a Topic

Without authentication:

mosquitto_sub -h localhost -t "test/topic"

With authentication:

mosquitto_sub -h localhost -u "myUser" -P "myPassword" -t "test/topic"

Tip: For better performance, set a static IP on your Raspberry Pi: