ESP32 SHT25 Temperature and Humidity Sensor

Code Examples

Below you can find code examples of SHT25 Temperature and Humidity Sensor with ESP32 in several frameworks:

• Arduino IDE
• ESP-IDF
• ESPHome
• PlatformIO
• MicroPython

ESP32 SHT25 Arduino IDE Code Example

Example in Arduino IDE

Fill in your main Arduino IDE sketch file with the following code to use the SHT25 Temperature and Humidity Sensor:

#include <Wire.h>
#include "SHT2x.h"

SHT2x sht;

void setup() {
  Wire.begin();
  Serial.begin(9600);
}

void loop() {
  float temperature = sht.GetTemperature();
  float humidity = sht.GetHumidity();
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" °C");
  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.println(" %");
  delay(2000);
}

This Arduino sketch demonstrates how to interface with the SHT25 sensor using the SHT2x library. It initializes the sensor and reads temperature and humidity data every 2 seconds, printing the results to the Serial Monitor. Ensure that the SHT2x library is installed in your Arduino IDE.

Connect your ESP32 to your computer via a USB cable, Ensure the correct Board and Port are selected under Tools, Click the "Upload" button in the Arduino IDE to compile and upload the code to your ESP32.

ESP32 SHT25 ESP-IDF Code Example

Example in Espressif IoT Framework (ESP-IDF)

If you're using ESP-IDF to work with the SHT25 Temperature and Humidity Sensor, here's how you can set it up and read data from the sensor. Fill in this code in the main ESP-IDF file:

uint16_t raw_humidity = (data[0] << 8) | data[1];
    uint8_t cmd_temp = 0xF3; // Command for temperature measurement
    i2c_master_write_to_device(I2C_MASTER_NUM, SHT25_SENSOR_ADDR, &cmd_temp, 1, pdMS_TO_TICKS(1000));
    vTaskDelay(pdMS_TO_TICKS(50));
    i2c_master_read_from_device(I2C_MASTER_NUM, SHT25_SENSOR_ADDR, data, 3, pdMS_TO_TICKS(1000));

    uint16_t raw_temperature = (data[0] << 8) | data[1];

    float humidity = -6.0 + 125.0 * ((float)raw_humidity / 65536.0);
    float temperature = -46.85 + 175.72 * ((float)raw_temperature / 65536.0);

    printf("Temperature: %.2f °C, Humidity: %.2f %%\n", temperature, humidity);
}

void app_main() {
    ESP_ERROR_CHECK(i2c_master_init());

    while (1) {
        read_sht25_sensor();
        vTaskDelay(pdMS_TO_TICKS(2000));
    }
}

This ESP-IDF code demonstrates how to interface with the SHT25 sensor using the I2C protocol. It initializes the I2C master and communicates with the sensor to read temperature and humidity data. Raw sensor values are converted to human-readable units using the formulas provided in the SHT25 datasheet. Readings are printed to the console every 2 seconds.

Update the I2C pins (I2C_MASTER_SDA_IO and I2C_MASTER_SCL_IO) to match your ESP32 hardware setup, Use idf.py build to compile the project, Use idf.py flash to upload the code to your ESP32.

ESP32 SHT25 ESPHome Code Example

Example in ESPHome (Home Assistant)

Fill in this configuration in your ESPHome YAML configuration file (example.yml) to integrate the SHT25 Temperature and Humidity Sensor

sensor:
  - platform: sht3x
    address: 0x40
    temperature:
      name: "Indoor Temperature"
    humidity:
      name: "Indoor Humidity"
    update_interval: 60s

This ESPHome configuration defines the SHT25 sensor using the `sht3x` platform (compatible for earlier SHT2x series as well). The I2C address is set to 0x40. Two entities are created for temperature and humidity, labeled with user-friendly names like 'Indoor Temperature' and 'Indoor Humidity.' The `update_interval` is set to 60 seconds, meaning data is refreshed every minute.

Upload this code to your ESP32 using the ESPHome dashboard or the esphome run command.

ESP32 SHT25 PlatformIO Code Example

Example in PlatformIO Framework

For PlatformIO, make sure to configure the platformio.ini file with the appropriate environment and libraries, and then proceed with the code.

Configure platformio.ini

First, your platformio.ini should look like below. You might need to include some libraries as shown. Make sure to change the board to your ESP32:

[env:esp32dev]
platform = espressif32
board = esp32dev
framework = arduino
lib_deps = 
    "Sensirion/SHT2x"
monitor_speed = 115200

ESP32 SHT25 PlatformIO Example Code

Write this code in your PlatformIO project under the src/main.cpp file to use the SHT25 Temperature and Humidity Sensor:

#include <Wire.h>
#include "SHT2x.h"

SHT2x sht;

void setup() {
    Wire.begin();
    Serial.begin(115200);
}

void loop() {
    float temperature = sht.GetTemperature();
    float humidity = sht.GetHumidity();

    Serial.print("Temperature: ");
    Serial.print(temperature);
    Serial.println(" °C");
    Serial.print("Humidity: ");
    Serial.print(humidity);
    Serial.println(" %");

    delay(2000);
}

This PlatformIO sketch demonstrates the usage of the SHT25 sensor with the ESP32 board. It uses the Sensirion SHT2x library to interface with the sensor. The code initializes the sensor, reads temperature and humidity data every 2 seconds, and prints the results to the Serial Monitor. Ensure the `Sensirion/SHT2x` library is included in the project dependencies.

Upload the code to your ESP32 using the PlatformIO "Upload" button in your IDE or the pio run --target upload command.

ESP32 SHT25 MicroPython Code Example

Example in Micro Python Framework

Fill in this script in your MicroPython main.py file (main.py) to integrate the SHT25 Temperature and Humidity Sensor with your ESP32.

from machine import I2C, Pin
from time import sleep
import sht21

# Initialize I2C
i2c = I2C(0, scl=Pin(22), sda=Pin(21))

# Initialize the SHT25 sensor
sensor = sht21.SHT21(i2c)

while True:
    try:
        temperature = sensor.read_temperature()
        humidity = sensor.read_humidity()

        print(f"Temperature: {temperature:.2f} °C")
        print(f"Humidity: {humidity:.2f} %")
    except Exception as e:
        print(f"Error reading sensor: {e}")

    sleep(2)

This MicroPython code uses the `sht21` library to communicate with the SHT25 sensor over I2C. It reads temperature and humidity data in a loop, prints the readings to the console, and handles any errors that occur during communication. The data is updated every 2 seconds.

Upload this code to your ESP32 using a MicroPython-compatible IDE, such as Thonny, uPyCraft, or tools like ampy.