ESP32 KY-015 Temperature and Humidity Sensor Module

🛠️ KY-015 Temperature and Humidity Sensor Module 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.

❌ No Data Output

⚠️ Incorrect or Fluctuating Readings

💻 Code Examples

Below you can find code examples of KY-015 Temperature and Humidity Sensor Module with ESP32 in several frameworks:

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

If you encounter issues while using the KY-015 Temperature and Humidity Sensor Module, check the Common Issues Troubleshooting Guide.

ESP32 KY-015 Arduino IDE Code Example

Example in Arduino IDE

Fill in your main Arduino IDE sketch file with the following code to use the KY-015 Temperature and Humidity Sensor Module:

#include <DHT.h>

#define DHTPIN 2     // Digital pin connected to the DHT sensor
#define DHTTYPE DHT11   // DHT 11

DHT dht(DHTPIN, DHTTYPE);

void setup() {
    Serial.begin(9600);
    Serial.println("KY-015 Test - Temperature and Humidity:");
    dht.begin();
}

void loop() {
    delay(2000);
    float h = dht.readHumidity();
    float t = dht.readTemperature();
    if (isnan(h) || isnan(t)) {
        Serial.println("Failed to read from DHT sensor!");
        return;
    }
    Serial.print("Humidity: ");
    Serial.print(h);
    Serial.print(" %	");
    Serial.print("Temperature: ");
    Serial.print(t);
    Serial.println(" °C");
}

This Arduino code utilizes the DHT library to read temperature and humidity data from the KY-015 sensor. The sensor is connected to digital pin 2, and the readings are displayed on the serial monitor every two seconds.

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 KY-015 ESP-IDF Code Example

Example in Espressif IoT Framework (ESP-IDF)

If you're using ESP-IDF to work with the KY-015 Temperature and Humidity Sensor Module, 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/gpio.h"
#include "dht.h"

#define DHT_PIN GPIO_NUM_4

void app_main(void) {
    printf("KY-015 Sensor Test\n");
    while (1) {
        int16_t temperature = 0;
        int16_t humidity = 0;
        if (dht_read_data(DHT_TYPE_DHT11, DHT_PIN, &humidity, &temperature) == ESP_OK) {
            printf("Humidity: %d.%d%% Temperature: %d.%d°C\n", humidity / 10, humidity % 10, temperature / 10, temperature % 10);
        } else {
            printf("Could not read data from sensor\n");
        }
        vTaskDelay(pdMS_TO_TICKS(2000));
    }
}

This ESP-IDF code reads temperature and humidity data from the KY-015 sensor using the DHT11 library. The sensor is connected to GPIO4, and data is printed to the console every 2 seconds. If the reading fails, an error message is displayed.

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 KY-015 ESPHome Code Example

Example in ESPHome (Home Assistant)

Fill in this configuration in your ESPHome YAML configuration file (example.yml) to integrate the KY-015 Temperature and Humidity Sensor Module

sensor:
  - platform: dht
    pin: GPIO4
    model: DHT11
    temperature:
      name: "KY-015 Temperature"
    humidity:
      name: "KY-015 Humidity"
    update_interval: 2s

This ESPHome configuration sets up the KY-015 temperature and humidity sensor using the DHT11 protocol. The sensor is connected to GPIO4, and readings are updated every 2 seconds.

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

ESP32 KY-015 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:esp32]
platform = espressif32
board = esp32dev
framework = arduino
lib_deps =
    adafruit/DHT sensor library

ESP32 KY-015 PlatformIO Example Code

Write this code in your PlatformIO project under the src/main.cpp file to use the KY-015 Temperature and Humidity Sensor Module:

#include <Arduino.h>
#include <DHT.h>

#define DHTPIN 4  // Digital pin connected to the DHT sensor
#define DHTTYPE DHT11

DHT dht(DHTPIN, DHTTYPE);

void setup() {
    Serial.begin(115200);
    Serial.println("KY-015 Test - Temperature and Humidity:");
    dht.begin();
}

void loop() {
    delay(2000);
    float h = dht.readHumidity();
    float t = dht.readTemperature();
    if (isnan(h) || isnan(t)) {
        Serial.println("Failed to read from DHT sensor!");
        return;
    }
    Serial.print("Humidity: ");
    Serial.print(h);
    Serial.print(" %	");
    Serial.print("Temperature: ");
    Serial.print(t);
    Serial.println(" °C");
}

This PlatformIO code reads the KY-015 sensor data using the DHT library. It prints temperature and humidity values every 2 seconds, with error handling for failed sensor readings.

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

ESP32 KY-015 MicroPython Code Example

Example in Micro Python Framework

Fill in this script in your MicroPython main.py file (main.py) to integrate the KY-015 Temperature and Humidity Sensor Module with your ESP32.

import dht
import machine
import time

sensor = dht.DHT11(machine.Pin(4))

while True:
    try:
        sensor.measure()
        temp = sensor.temperature()
        humidity = sensor.humidity()
        print("Temperature:", temp, "°C", " Humidity:", humidity, "%")
    except OSError as e:
        print("Failed to read sensor.")
    time.sleep(2)

This MicroPython script reads temperature and humidity data from the KY-015 sensor connected to GPIO4. It updates readings every 2 seconds and handles errors in case of sensor failure.

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