A simple hardware test project for SHT3x temperature and humidity sensors using an ESP32 and the I2C communication protocol.
This project is part of the TechOnIt Hardware Test collection and is intended to validate SHT3x sensor modules independently before integrating them into the TechOnIt Node firmware.
This project is designed for the Sensirion SHT3x family, including:
- SHT30
- SHT31
- SHT35
The exact supported features may vary depending on the specific sensor/module.
- ESP32 / NodeMCU
- SHT3x Temperature & Humidity Sensor
- USB cable
| SHT3x | ESP32 |
|---|---|
| VCC | 3.3V |
| GND | GND |
| SDA | GPIO 4 |
| SCL | GPIO 5 |
The default I2C address used by most SHT3x modules is:
0x44
Some modules may use:
0x45
depending on the address configuration.
hw-test-shtx/
├── platformio.ini
├── src/
│ └── main.cpp
└── README.md
This project uses:
- PlatformIO
- Arduino Framework
- ESP32
- Wire / I2C
- Adafruit SHT31 Library
The required library is defined in platformio.ini and will be installed automatically by PlatformIO.
The ESP32 communicates with the SHT3x sensor through the I2C interface.
Every 5 seconds, the firmware:
- Reads the temperature.
- Reads the relative humidity.
- Prints both values to the Serial Monitor.
ESP32
│
│ I2C
▼
SHT3x
├── Temperature
└── Humidity
SHT3x initialized.
Temperature: 25.31 °C | Humidity: 42.87 %
Temperature: 25.28 °C | Humidity: 43.02 %
Temperature: 25.30 °C | Humidity: 42.95 %
Use the following baud rate:
115200
This repository is a standalone hardware validation project.
It is intentionally kept separate from the production Node firmware so that individual hardware modules can be tested independently before integration.
The sensor implementation can later be integrated into the TechOnIt Node firmware as a sensor driver.
agent-node— TechOnIt Node firmwareagent-controller— TechOnIt Controller softwareagent-sdk— TechOnIt SDK
This project is part of the TechOnIt open-source IoT ecosystem.