KY-028 Digital Thermistor Temperature Sensor Module

The KY-028 Digital Thermistor Temperature Sensor Module is a high-performance temperature detection module designed for versatility and precision in monitoring ambient temperature changes. It combines both analog and digital outputs, giving users the flexibility to collect accurate temperature readings (via analog output) or to trigger digital events (via digital output) once a certain temperature threshold is reached.

This module integrates an NTC (Negative Temperature Coefficient) thermistor, which decreases in resistance as the temperature increases — a key property utilized in accurate temperature sensing. The built-in LM393 voltage comparator chip enables real-time comparison between the measured temperature and an adjustable reference set by the onboard potentiometer.

With a working voltage of 3.3V to 5V, the KY-028 sensor seamlessly interfaces with popular microcontrollers like Arduino, Raspberry Pi, ESP8266, ESP32, and NodeMCU, making it a perfect tool for educational projects, prototypes, and industrial monitoring systems.

This sensor module also includes dual LEDs: a power indicator to show module activity and a signal indicator that turns on when the detected temperature surpasses the preset limit. It’s lightweight, durable, and easy to integrate into any embedded electronics or IoT platform.

⚙️ Technical Specifications:

• Model: KY-028 (AD-028)

• Operating Voltage: 3.3V – 5V DC

• Sensor Type: NTC Thermistor

• Comparator Chip: LM393

• Output Type: Analog (AO) + Digital (DO)

• Operating Temperature Range: -25°C to +80°C

• Response Time: < 1 second

• Adjustable Sensitivity: Yes (via potentiometer)

• Dimensions: 32mm x 14mm

• Signal Indicators: Power LED and Digital Output LED

• Interface: 3-pin (VCC, GND, DO/AO)

• Compatibility: Arduino, Raspberry Pi, ESP8266, ESP32, STM32

💡 Key Features:

• 🌡 Dual Output Functionality: Supports both analog output for temperature measurement and digital output for high/low threshold detection.

• ⚙️ Adjustable Sensitivity: Fine-tune trigger threshold using onboard potentiometer.

• 💡 Onboard Indicators: LED indicators show power and signal status for easy debugging.

• 🔌 Easy Integration: Compatible with Arduino, Raspberry Pi, NodeMCU, and other IoT platforms.

• ⚡ Fast and Reliable: Real-time temperature response and stable signal output.

• 🔧 Compact Design: Small footprint ideal for embedded applications.

• 🧠 Educational Use: Excellent for learning analog vs. digital signals in temperature measurement.

⚠️ Precautions:

• Avoid contact with water or high humidity, as it can damage the thermistor.

• Do not expose the sensor to extreme heat sources or direct sunlight for extended periods.

• Use a stable 5V regulated power supply to prevent data fluctuations.

• Regularly calibrate the sensor for best accuracy in industrial or lab use.

🎯 Applications:

• Environmental Monitoring Systems: Measure room, greenhouse, or outdoor temperature.

• Home Automation Projects: Temperature-triggered control of fans, heaters, or alarms.

• IoT Systems: Integrate into smart sensors for remote temperature monitoring.

• Educational Experiments: Learn about thermistors and signal conditioning circuits.

• Industrial Automation: Detect overheating conditions or ambient temperature levels.

• Robotics: Integrate into temperature-sensitive robotic systems.

• Weather Stations: Combine with humidity and pressure sensors for complete climate data collection.

🔗 Internal Links:

• Electronics Components

• Arduino and Accessories

• Sensors & Modules

• Tools & Accessories

• ICs

🎥 YouTube Tutorial:

Watch KY-028 Thermistor Temperature Sensor Arduino Tutorial

🧩 Product Summary:

The KY-028 Digital Thermistor Temperature Sensor Module is a dual-mode (analog + digital) temperature detection solution that combines precision and flexibility. Featuring an NTC thermistor, LM393 comparator, and adjustable potentiometer, it delivers fast, reliable, and accurate thermal readings suitable for IoT, industrial, and educational projects. With its robust design, wide temperature range, and compatibility with leading microcontrollers, the KY-028 stands out as one of the most essential components for temperature-based automation systems.