Environmental Sensor

An ESP32-based environmental monitoring system that measures and publishes readings to an MQTT broker.

Features

• SHT45, BME280, BME680, SGP40/41, SCD41, and SDS011 support
• Temperature, humidity, pressure, CO2, VOC, NOX, PM2.5, and PM10 readings
• WiFi connectivity and MQTT publishing
• Modular sensor driver implementation with multiple configurations

The device periodically samples environmental data and sends it to an MQTT broker for logging or monitoring.

Typical wiring:

BME280	ESP32
VCC	3.3V
GND	GND
SDA	GPIO 21
SCL	GPIO 22

MQTT Payload

Sensor readings are published as JSON to a topic for each reading type.

Example payload:

{
  "time": 1773430361,
  "val": 20.48
}

Example topic:

device/1/temperature

Configuration

cp include/config.example.hpp include/config.hpp

Build

Clone the repository:

git clone https://github.com/benmoses-dev/environmental-sensor.git
cd environmental-sensor

Build the firmware:

idf.py build

Flash to the ESP32:

idf.py -p PORT flash monitor