ESP32 SHT11 Temperature and Humidity Sensor

🛠️ SHT11 Temperature and Humidity Sensor Troubleshooting

This guide outlines a systematic approach to troubleshoot and resolve common problems with the . Start by confirming that the hardware connections are correct, as wiring mistakes are the most frequent cause of issues. If you are sure the connections are correct, follow the below steps to debug common issues.

❌ Initialization Failure

⚠️ Incorrect Readings

🚫 Communication Errors

💻 Code Examples

Below you can find code examples of SHT11 Temperature and Humidity Sensor with ESP32 in several frameworks:

• Arduino IDE
• ESP-IDF
• ESPHome
• PlatformIO

If you encounter issues while using the SHT11 Temperature and Humidity Sensor, check the Common Issues Troubleshooting Guide.

ESP32 SHT11 Arduino IDE Code Example

Example in Arduino IDE

Fill in your main Arduino IDE sketch file with the following code to use the SHT11 Temperature and Humidity Sensor:

#include <SHT1x.h>

#define dataPin 10
#define clockPin 11

SHT1x sht1x(dataPin, clockPin);

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

void loop() {
  float tempC = sht1x.readTemperatureC();
  float humidity = sht1x.readHumidity();

  Serial.print("Temperature: ");
  Serial.print(tempC);
  Serial.println(" °C");

  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.println(" %");

  delay(2000);
}

This Arduino code initializes the SHT11 sensor using the SHT1x library. In the setup() function, it sets up serial communication. In the loop() function, it reads the temperature in Celsius and humidity from the sensor and prints the values to the Serial Monitor every two seconds. The SHT1x library facilitates communication with the sensor over its proprietary 2-wire interface.

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 SHT11 ESP-IDF Code Example

Example in Espressif IoT Framework (ESP-IDF)

If you're using ESP-IDF to work with the SHT11 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 "sht1x.h"
#include "esp_log.h"

#define DATA_PIN GPIO_NUM_21
#define SCK_PIN GPIO_NUM_22

static const char *TAG = "SHT11";

void app_main() {
    ESP_LOGI(TAG, "Initializing SHT11...");
    sht1x_dev_t dev;
    sht1x_init(&dev, DATA_PIN, SCK_PIN);

    while (1) {
        float temperature, humidity;
        if (sht1x_read_temperature(&dev, &temperature) == ESP_OK &&
            sht1x_read_humidity(&dev, &humidity) == ESP_OK) {
            ESP_LOGI(TAG, "Temperature: %.2f°C", temperature);
            ESP_LOGI(TAG, "Humidity: %.2f%%", humidity);
        } else {
            ESP_LOGE(TAG, "Failed to read data from SHT11 sensor");
        }
        vTaskDelay(2000 / portTICK_PERIOD_MS);
    }
}

This ESP-IDF code configures the ESP32 to communicate with the SHT11 sensor using its proprietary Sensibus interface. The sht1x_init function initializes the sensor, while the sht1x_read_temperature and sht1x_read_humidity functions fetch temperature and humidity data. The values are logged to the console every two seconds, and errors are reported if data retrieval fails.

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 SHT11 ESPHome Code Example

Example in ESPHome (Home Assistant)

Fill in this configuration in your ESPHome YAML configuration file (example.yml) to integrate the SHT11 Temperature and Humidity Sensor

sensor:
  - platform: sht1x
    data_pin: GPIO21
    clock_pin: GPIO22
    temperature:
      name: "SHT11 Temperature"
    humidity:
      name: "SHT11 Humidity"
    update_interval: 2s

This ESPHome configuration sets up the SHT11 sensor to measure temperature and humidity. The sensor communicates over GPIO pins 21 and 22 using its Sensibus protocol. The readings update every two seconds.

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

ESP32 SHT11 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 = 
    panStamp/SHT1x Library
    wire
monitor_speed = 115200

ESP32 SHT11 PlatformIO Example Code

Write this code in your PlatformIO project under the src/main.cpp file to use the SHT11 Temperature and Humidity Sensor:

#include <SHT1x.h>

#define dataPin 21
#define clockPin 22

SHT1x sht1x(dataPin, clockPin);

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

void loop() {
  Serial.print("Temperature: ");
  Serial.print(sht1x.readTemperatureC(), 1);
  Serial.println(" °C");

  Serial.print("Humidity: ");
  Serial.print(sht1x.readHumidity(), 1);
  Serial.println(" %");

  delay(2000);
}

This PlatformIO code initializes the SHT11 sensor using the SHT1x library. The sensor communicates over GPIO pins 21 and 22 using its proprietary Sensibus interface. The program continuously reads and prints temperature and humidity values to the Serial Monitor every two seconds.

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