SHTC3 Temperature and Humidity Sensor

Name: SHTC3 Temperature and Humidity Sensor
Brand: ESP32
Price: 4 USD
Availability: InStock

SHTC3 Temperature and Humidity Sensor image

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Overview

The SHTC3 sensor offers precise temperature and humidity measurements in a compact and energy-efficient package. It is designed for low-power IoT applications and features Sensirion's CMOSens® technology for high accuracy and long-term stability.

Quick Navigation

📋 Specs 📍 Pinout 🔌 Wiring 🔧 Debug

Code Examples

Arduino

C++ Framework

ESP-IDF

Native Framework

ESPHome

YAML Configuration

PlatformIO

IDE & Toolchain

MicroPython

Python Framework

About SHTC3 Temperature and Humidity Sensor

The SHTC3, developed by Sensirion, is a high-accuracy digital temperature and humidity sensor optimized for battery-powered applications. With its low power consumption and compact design, it is ideal for IoT devices, consumer electronics, and portable applications.

⚡ Key Features

Energy-Efficient – Designed for low-power operation, perfect for battery-driven devices.
High Accuracy & Stability – Delivers precise temperature and humidity readings.
I²C Communication – Seamless integration with ESP32, Arduino, and embedded systems.
Compact & Lightweight – Ideal for wearables, smart home devices, and portable monitoring systems.

With its low power consumption and high precision, the SHTC3 is an excellent choice for energy-efficient climate sensing applications. 🚀

Where to Buy

Get Your SHTC3

Starting from

$4 per unit

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💡 Prices are subject to change. We earn from qualifying purchases as an Amazon Associate.

Technical Specs

SHTC3 Specifications

Complete technical specification details for SHTC3 Temperature and Humidity Sensor

📊 Technical Parameters

Operating Voltage 1.62V to 3.6V

Temperature Range -40°C to 125°C

Humidity Range 0% to 100% RH

Temperature Accuracy ±0.2°C

Humidity Accuracy ±2% RH

Interface I2C

Dimensions 2mm x 2mm x 0.75mm

Download Full Datasheet

Pin Configuration

SHTC3 Pinout

The **SHTC3** has a simple 4-pin I²C interface for ultra-compact temperature and humidity sensing:

Visual Pinout Diagram

Pinout Diagram Primary

SHTC3 Temperature and Humidity Sensor pinout

Total Pins

Pin Types

Power

Communication

Quick Tips

🔌

**Interface**: I²C (Two-Wire Interface) for simple connectivity,📡 **I²C Address**: 0x70 (fixed, not configurable)

💡

**Pull-up Resistors**: 10kΩ recommended on SDA and SCL lines,⚡ **Power**: Ultra-low voltage operation (1.62V–3.6V)

🔋

**Energy Efficient**: Designed for battery-powered IoT applications

Pin Descriptions

Pin Name	Type	Description	Notes
1 VDD	Power	Power supply voltage	1.62V to 3.6V (ultra-low power)
2 GND	Power	Ground reference
3 SDA	Communication	I²C Serial Data Line	Bidirectional data
4 SCL	Communication	I²C Serial Clock Line	Master clock signal

Connection Guide

Wiring SHTC3 to ESP32

To interface the **SHTC3** sensor with an **ESP32** using I²C:

Visual Wiring Diagram

Wiring Diagram Recommended

SHTC3 Temperature and Humidity Sensor wiring with ESP32

Connections

Connection Status

Required

Protocol

I2C

Pin Connections

SHTC3 Pin	ESP32 Pin	Description
1 VDD Required	3.3V	Power supply
2 GND Required	GND	Ground
3 SDA Required	GPIO21	I²C data line (default)
4 SCL Required	GPIO22	I²C clock line (default)

💡

**Pull-up Resistors**: Use 10kΩ resistors between SDA/SCL and VDD for reliable communication

🔌

**I²C Pins**: GPIO21 (SDA) and GPIO22 (SCL) are default but can be changed in ESPHome config

⚡

**Low Power**: Ideal for battery-powered devices with minimal current draw

📡

**Single Address**: Fixed I²C address 0x70 (no address conflicts with most other sensors)

Help & Support

SHTC3 Troubleshooting

Common issues and solutions to help you get your sensor working

Common Issues

Debugging Tips

Additional Resources

Datasheet

Technical specifications and guidelines

Code Examples

SHTC3 Programming Examples

Ready-to-use code examples for different platforms and frameworks

#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.

#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.

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.

platformio.ini

[env:esp32dev]
platform = espressif32
board = esp32dev
framework = arduino
lib_deps = 
    adafruit/Adafruit SHTC3 Library @ ^1.0.0
monitor_speed = 115200

main.cpp

#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.

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.

Summary

Wrapping Up SHTC3

The ESP32 SHTC3 Temperature and Humidity Sensor is a powerful environment sensor that offers excellent performance and reliability. With support for multiple development platforms including Arduino, ESP-IDF, ESPHome, PlatformIO, and MicroPython, it's a versatile choice for your IoT projects.