How to Use KY-017: Examples, Pinouts, and Specs

The KY-017 is a temperature sensor module that utilizes the LM35 temperature sensor. It provides an analog output voltage that is directly proportional to the temperature in degrees Celsius. The module is designed for ease of use, making it ideal for temperature monitoring applications in various projects. Its compact size and simple interface make it suitable for integration with microcontrollers, such as Arduino, Raspberry Pi, and other development boards.

• Environmental temperature monitoring
• Home automation systems
• Weather stations
• Industrial temperature sensing
• Educational projects and prototyping

The KY-017 module is based on the LM35 temperature sensor, which offers high accuracy and linear output. Below are the key technical details:

The KY-017 module has three pins for interfacing:

1. Power the Module: Connect the VCC pin to a 5V power supply and the GND pin to the ground of your circuit.
2. Read the Output: Connect the OUT pin to an analog input pin of your microcontroller to read the temperature as an analog voltage.
3. Convert Voltage to Temperature: The LM35 outputs 10mV per degree Celsius. For example, an output of 250mV corresponds to 25°C.

• Ensure the power supply voltage is within the specified range (4V to 30V) to avoid damaging the module.
• Place the sensor in a location free from direct heat sources or airflow to obtain accurate readings.
• Use a decoupling capacitor (e.g., 0.1µF) between VCC and GND to reduce noise in the output signal.
• If using the module in a noisy environment, consider shielding the sensor or using a low-pass filter.

Below is an example of how to connect and read data from the KY-017 module using an Arduino UNO:

• Connect the VCC pin of the KY-017 to the 5V pin of the Arduino.
• Connect the GND pin of the KY-017 to the GND pin of the Arduino.
• Connect the OUT pin of the KY-017 to the A0 analog input pin of the Arduino.

// KY-017 Temperature Sensor Example with Arduino UNO
// Reads the analog output from the KY-017 and converts it to temperature in °C.

const int sensorPin = A0; // KY-017 OUT pin connected to Arduino A0
float voltage;            // Variable to store the sensor output voltage
float temperature;        // Variable to store the calculated temperature

void setup() {
  Serial.begin(9600); // Initialize serial communication at 9600 baud
}

void loop() {
  int sensorValue = analogRead(sensorPin); // Read the analog value (0-1023)
  
  // Convert the analog value to voltage (assuming 5V reference)
  voltage = sensorValue * (5.0 / 1023.0);
  
  // Convert the voltage to temperature (10mV per °C for LM35)
  temperature = voltage * 100.0;
  
  // Print the temperature to the Serial Monitor
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" °C");
  
  delay(1000); // Wait for 1 second before the next reading
}

1. No Output or Incorrect Readings

   • Cause: Incorrect wiring or loose connections.
   • Solution: Double-check the connections and ensure the VCC, GND, and OUT pins are properly connected.

2. Fluctuating Temperature Readings

   • Cause: Electrical noise or unstable power supply.
   • Solution: Add a decoupling capacitor (e.g., 0.1µF) between VCC and GND to stabilize the power supply.

3. Output Voltage Does Not Match Expected Temperature

   • Cause: Incorrect voltage reference or calculation.
   • Solution: Verify the Arduino's analog reference voltage and ensure the calculation formula is correct.

4. Sensor Overheating

   • Cause: Excessive power supply voltage.
   • Solution: Ensure the supply voltage is within the specified range (4V to 30V).

Q1: Can the KY-017 measure negative temperatures?
A1: No, the LM35 sensor used in the KY-017 module is designed to measure temperatures starting from 0°C. For negative temperature measurements, additional circuitry or a different sensor is required.

Q2: Can I use the KY-017 with a 3.3V microcontroller?
A2: Yes, the KY-017 can operate at 3.3V, but the output voltage range will be lower. Ensure your microcontroller's ADC can accurately read the reduced voltage range.

Q3: How do I improve the accuracy of the sensor?
A3: Place the sensor in a stable environment, away from heat sources or airflow. Additionally, use a high-resolution ADC for better precision.

Q4: Is the KY-017 waterproof?
A4: No, the KY-017 is not waterproof. For outdoor or wet environments, consider using a waterproof temperature sensor like the DS18B20.