ESP32 SHTC3 Temperature and Humidity Sensor

Code Examples

Below you can find code examples of SHTC3 Temperature and Humidity Sensor with ESP32 in several frameworks:

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

ESP32 SHTC3 Arduino IDE Code Example

Example in Arduino IDE

Fill in your main Arduino IDE sketch file with the following code to use the SHTC3 Temperature and Humidity Sensor:

#include <Wire.h>
#include "Adafruit_SHTC3.h"

Adafruit_SHTC3 shtc3;

void setup() {
  Serial.begin(115200);
  if (!shtc3.begin()) {
    Serial.println("Couldn't find SHTC3 sensor!");
    while (1) delay(10);
  }
  Serial.println("SHTC3 initialized");
}

void loop() {
  sensors_event_t humidity, temp;
  if (!shtc3.getEvent(&humidity, &temp)) {
    Serial.println("Failed to read sensor data");
    return;
  }
  Serial.print("Temperature: "); Serial.print(temp.temperature); Serial.println(" °C");
  Serial.print("Humidity: "); Serial.print(humidity.relative_humidity); Serial.println(" %");
  delay(2000);
}

This Arduino sketch demonstrates how to use the SHTC3 sensor with the Adafruit SHTC3 library. It initializes the sensor, configures it for data reading, and retrieves temperature and humidity values every 2 seconds. The readings are printed to the Serial Monitor.

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 SHTC3 ESP-IDF Code Example

Example in Espressif IoT Framework (ESP-IDF)

If you're using ESP-IDF to work with the SHTC3 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:

#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/i2c.h"

#define I2C_MASTER_SCL_IO    22    /*!< GPIO number for I2C master clock */
#define I2C_MASTER_SDA_IO    21    /*!< GPIO number for I2C master data */
#define I2C_MASTER_NUM       I2C_NUM_0 /*!< I2C master port */
#define I2C_MASTER_FREQ_HZ   100000     /*!< I2C master clock frequency */
#define SHTC3_SENSOR_ADDR    0x70       /*!< SHTC3 I2C address */

static esp_err_t i2c_master_init(void) {
    i2c_config_t conf = {
        .mode = I2C_MODE_MASTER,
        .sda_io_num = I2C_MASTER_SDA_IO,
        .scl_io_num = I2C_MASTER_SCL_IO,
        .sda_pullup_en = GPIO_PULLUP_ENABLE,
        .scl_pullup_en = GPIO_PULLUP_ENABLE,
        .master.clk_speed = I2C_MASTER_FREQ_HZ,
    };
    ESP_ERROR_CHECK(i2c_param_config(I2C_MASTER_NUM, &conf));
    return i2c_driver_install(I2C_MASTER_NUM, conf.mode, 0, 0, 0);
}

void read_shtc3_sensor() {
    uint8_t data[6];
    uint8_t cmd[] = {0x7C, 0xA2}; // Measurement command
    i2c_master_write_to_device(I2C_MASTER_NUM, SHTC3_SENSOR_ADDR, cmd, 2, pdMS_TO_TICKS(1000));
    vTaskDelay(pdMS_TO_TICKS(20));
    i2c_master_read_from_device(I2C_MASTER_NUM, SHTC3_SENSOR_ADDR, data, 6, pdMS_TO_TICKS(1000));

    uint16_t temp_raw = (data[0] << 8) | data[1];
    uint16_t hum_raw = (data[3] << 8) | data[4];

    float temperature = -45 + 175 * ((float)temp_raw / 65535.0);
    float humidity = 100 * ((float)hum_raw / 65535.0);

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

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

    while (1) {
        read_shtc3_sensor();
        vTaskDelay(pdMS_TO_TICKS(2000));
    }
}

This ESP-IDF code initializes the I2C master, sends a command to the SHTC3 sensor to perform measurements, reads the raw temperature and humidity data, and converts it into human-readable values. The results are printed 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 SHTC3 ESPHome Code Example

Example in ESPHome (Home Assistant)

Fill in this configuration in your ESPHome YAML configuration file (example.yml) to integrate the SHTC3 Temperature and Humidity Sensor

sensor:
  - platform: shtc3
    temperature:
      name: "Room Temperature"
    humidity:
      name: "Room Humidity"
    update_interval: 60s

This ESPHome configuration defines the SHTC3 sensor. Two entities are created: one for temperature and one for humidity, with user-friendly names such as 'Room Temperature' and 'Room Humidity.' The sensor reads and updates data every 60 seconds.

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

ESP32 SHTC3 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 = 
    adafruit/Adafruit SHTC3 Library @ ^1.0.0
monitor_speed = 115200

ESP32 SHTC3 PlatformIO Example Code

Write this code in your PlatformIO project under the src/main.cpp file to use the SHTC3 Temperature and Humidity Sensor:

#include <Wire.h>
#include "Adafruit_SHTC3.h"

Adafruit_SHTC3 shtc3;

void setup() {
    Serial.begin(115200);
    if (!shtc3.begin()) {
        Serial.println("Couldn't find SHTC3 sensor!");
        while (1) delay(10);
    }
    Serial.println("SHTC3 initialized.");
}

void loop() {
    sensors_event_t temp, humidity;
    if (!shtc3.getEvent(&humidity, &temp)) {
        Serial.println("Failed to read sensor data");
        return;
    }
    Serial.print("Temperature: ");
    Serial.print(temp.temperature);
    Serial.println(" °C");
    Serial.print("Humidity: ");
    Serial.print(humidity.relative_humidity);
    Serial.println(" %");
    delay(2000);
}

This PlatformIO code uses the Adafruit SHTC3 library to initialize and interface with the SHTC3 sensor. It retrieves temperature and humidity values and prints them every 2 seconds to the Serial Monitor.

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

ESP32 SHTC3 MicroPython Code Example

Example in Micro Python Framework

Fill in this script in your MicroPython main.py file (main.py) to integrate the SHTC3 Temperature and Humidity Sensor with your ESP32.

from machine import I2C, Pin
from time import sleep

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

# SHTC3 I2C address
SHTC3_ADDR = 0x70

# Command for measurement
MEASURE_CMD = b'\x7C\xA2'

while True:
    try:
        i2c.writeto(SHTC3_ADDR, MEASURE_CMD)
        sleep(0.02)  # Wait for measurement to complete
        data = i2c.readfrom(SHTC3_ADDR, 6)
        raw_temp = (data[0] << 8) | data[1]
        raw_hum = (data[3] << 8) | data[4]
        temperature = -45 + 175 * (raw_temp / 65535.0)
        humidity = 100 * (raw_hum / 65535.0)
        print("Temperature: {:.2f} °C".format(temperature))
        print("Humidity: {:.2f} %".format(humidity))
    except Exception as e:
        print("Error reading SHTC3: ", e)
    sleep(2)

This MicroPython script interfaces with the SHTC3 sensor using I2C. It sends a measurement command, reads the raw data, processes it, and prints temperature and humidity values to the console every 2 seconds.

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