How to Use KY-028 Sensor de Temperatura Digital: Examples, Pinouts, and Specs

The KY-028 Sensor de Temperatura Digital is a versatile temperature sensor module designed for accurate temperature monitoring. Manufactured by Arduino (Part ID: jhj), this module typically uses LM35 or similar sensor technology to provide reliable temperature readings. It outputs data in both analog and digital formats, making it easy to interface with microcontrollers such as the Arduino UNO.

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

The KY-028 Sensor de Temperatura Digital is equipped with both analog and digital outputs, allowing for flexible integration into various projects. Below are the key technical details:

• Operating Voltage: 3.3V to 5V DC
• Output Type: Digital (threshold-based) and Analog (continuous)
• Temperature Range: -55°C to +125°C
• Accuracy: ±0.5°C (typical for LM35-based sensors)
• Dimensions: 32mm x 14mm x 8mm
• Interface: 3-pin header (VCC, GND, OUT)

The KY-028 module has a 3-pin interface. Below is the pinout description:

The KY-028 Sensor de Temperatura Digital is simple to use and can be connected directly to a microcontroller like the Arduino UNO. Below are the steps to use the sensor effectively:

1. Power the Sensor: Connect the VCC pin of the KY-028 to the 5V pin on the Arduino UNO. Connect the GND pin to the Arduino's GND.
2. Read the Output:
   • For digital output, connect the OUT pin to a digital input pin on the Arduino (e.g., D2).
   • For analog output, connect the OUT pin to an analog input pin on the Arduino (e.g., A0).
3. Set the Threshold: Use the onboard potentiometer to adjust the temperature threshold for the digital output.

Below is an example of how to read both digital and analog outputs from the KY-028 sensor using an Arduino UNO:

// KY-028 Temperature Sensor Example Code
// Reads both digital and analog outputs from the sensor

// Define pin connections
const int digitalPin = 2; // Digital output pin from KY-028
const int analogPin = A0; // Analog output pin from KY-028

void setup() {
  // Initialize serial communication for debugging
  Serial.begin(9600);

  // Set the digital pin as input
  pinMode(digitalPin, INPUT);
}

void loop() {
  // Read the digital output (HIGH or LOW)
  int digitalValue = digitalRead(digitalPin);

  // Read the analog output (temperature as a voltage)
  int analogValue = analogRead(analogPin);

  // Convert the analog value to a temperature (assuming LM35 sensor)
  float temperature = (analogValue * 5.0 / 1023.0) * 100.0;

  // Print the results to the Serial Monitor
  Serial.print("Digital Output: ");
  Serial.println(digitalValue);
  Serial.print("Analog Temperature: ");
  Serial.print(temperature);
  Serial.println(" °C");

  // Wait 1 second before the next reading
  delay(1000);
}

• Power Supply: Ensure the sensor is powered with a stable 3.3V or 5V DC supply.
• Threshold Adjustment: Use the onboard potentiometer to set the desired temperature threshold for the digital output.
• Analog Accuracy: For precise temperature readings, use the analog output and calibrate the sensor if necessary.
• Environmental Factors: Avoid placing the sensor in environments with high humidity or direct exposure to liquids.

1. No Output from the Sensor

   • Cause: Incorrect wiring or insufficient power supply.
   • Solution: Double-check the connections and ensure the sensor is powered with 3.3V or 5V.

2. Inaccurate Temperature Readings

   • Cause: Sensor calibration or environmental interference.
   • Solution: Calibrate the sensor using a known temperature source and adjust the readings in the code.

3. Digital Output Always HIGH or LOW

   • Cause: Incorrect threshold setting.
   • Solution: Adjust the potentiometer to set the desired temperature threshold.

4. Analog Output Not Changing

   • Cause: Faulty sensor or incorrect analog pin connection.
   • Solution: Verify the sensor's functionality and ensure the analog pin is correctly connected.

Q: Can the KY-028 measure negative temperatures?
A: Yes, the sensor can measure temperatures as low as -55°C, but ensure the microcontroller and code support negative values.

Q: How do I know if the digital output is working?
A: The onboard LED will light up when the temperature exceeds the set threshold.

Q: Can I use the KY-028 with a 3.3V microcontroller?
A: Yes, the sensor is compatible with both 3.3V and 5V systems.

Q: Is the sensor waterproof?
A: No, the KY-028 is not waterproof. Use a waterproof casing if necessary for your application.