ESP32 KY-013 Analog Temperature Sensor Module

🛠️ KY-013 Analog Temperature 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.

🌡️ Incorrect Temperature Readings

❌ No Output from Sensor

💻 Code Examples

Below you can find code examples of KY-013 Analog Temperature Sensor Module with ESP32 in several frameworks:

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

If you encounter issues while using the KY-013 Analog Temperature Sensor Module, check the Common Issues Troubleshooting Guide.

ESP32 KY-013 Arduino IDE Code Example

Example in Arduino IDE

Fill in your main Arduino IDE sketch file with the following code to use the KY-013 Analog Temperature Sensor Module:

#include <math.h>

int sensorPin = A0; // Analog input pin connected to the sensor

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

void loop() {
    int rawValue = analogRead(sensorPin);
    double voltage = rawValue * (5.0 / 1023.0);
    double resistance = (5.0 - voltage) * 10000 / voltage;
    double temperature = 1 / (log(resistance / 10000) / 3950 + 1 / 298.15) - 273.15;
    Serial.print("Temperature: ");
    Serial.print(temperature);
    Serial.println(" °C");
    delay(1000);
}

This Arduino code reads the analog value from the KY-013 sensor, calculates the corresponding temperature using the Steinhart-Hart equation, and outputs the temperature in Celsius to the serial monitor. The sensor is connected to analog pin A0.

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-013 ESP-IDF Code Example

Example in Espressif IoT Framework (ESP-IDF)

If you're using ESP-IDF to work with the KY-013 Analog Temperature 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 <math.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/adc.h"

#define ADC_CHANNEL ADC1_CHANNEL_0 // GPIO36

void app_main(void) {
    adc1_config_width(ADC_WIDTH_BIT_12);
    adc1_config_channel_atten(ADC_CHANNEL, ADC_ATTEN_DB_11);

    while (1) {
        int raw = adc1_get_raw(ADC_CHANNEL);
        double voltage = raw * (3.3 / 4095.0);
        double resistance = (3.3 - voltage) * 10000 / voltage;
        double temperature = 1 / (log(resistance / 10000) / 3950 + 1 / 298.15) - 273.15;
        printf("Temperature: %.2f °C\n", temperature);
        vTaskDelay(pdMS_TO_TICKS(1000));
    }
}

This ESP-IDF code configures ADC1 on GPIO36 to read the analog signal from the KY-013 sensor. It calculates the temperature using the Steinhart-Hart equation and prints the result in Celsius every second.

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-013 ESPHome Code Example

Example in ESPHome (Home Assistant)

Fill in this configuration in your ESPHome YAML configuration file (example.yml) to integrate the KY-013 Analog Temperature Sensor Module

sensor:
  - platform: ntc
    sensor: resistance_sensor
    name: "KY-013 Temperature Sensor"
    calibration:
      b_constant: 3950
      reference_temperature: 25°C
      reference_resistance: 10kΩ
  - platform: adc
    pin: GPIO36
    id: resistance_sensor
    update_interval: 1s

This ESPHome configuration sets up the KY-013 temperature sensor using an NTC thermistor on GPIO36. The resistance is measured via ADC, and the temperature is calculated using the Steinhart-Hart equation with a B-constant of 3950.

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

ESP32 KY-013 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

ESP32 KY-013 PlatformIO Example Code

Write this code in your PlatformIO project under the src/main.cpp file to use the KY-013 Analog Temperature Sensor Module:

#include <Arduino.h>
#include <math.h>

#define SENSOR_PIN 36 // Analog input pin

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

void loop() {
    int rawValue = analogRead(SENSOR_PIN);
    double voltage = rawValue * (3.3 / 4095.0);
    double resistance = (3.3 - voltage) * 10000 / voltage;
    double temperature = 1 / (log(resistance / 10000) / 3950 + 1 / 298.15) - 273.15;
    Serial.printf("Temperature: %.2f °C\n", temperature);
    delay(1000);
}

This PlatformIO code configures the KY-013 temperature sensor on GPIO36. It reads the analog value, converts it to voltage, calculates the resistance, and then determines the temperature using the Steinhart-Hart equation.

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

ESP32 KY-013 MicroPython Code Example

Example in Micro Python Framework

Fill in this script in your MicroPython main.py file (main.py) to integrate the KY-013 Analog Temperature Sensor Module with your ESP32.

import machine
import time
import math

SENSOR_PIN = 36  # ADC input pin
adc = machine.ADC(machine.Pin(SENSOR_PIN))
adc.atten(machine.ADC.ATTN_11DB)  # Full range 0-3.3V

def get_temperature():
    raw = adc.read()
    voltage = raw * (3.3 / 4095.0)
    resistance = (3.3 - voltage) * 10000 / voltage
    temperature = 1 / (math.log(resistance / 10000) / 3950 + 1 / 298.15) - 273.15
    return temperature

while True:
    print("Temperature:", round(get_temperature(), 2), "°C")
    time.sleep(1)

This MicroPython script reads the KY-013 sensor using ADC on GPIO36. It converts the voltage to resistance and then calculates the temperature using the Steinhart-Hart equation. The temperature is printed to the console every second.

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