Digital Temperature Thermal Sensor Module KY-028

Digital Temperature Thermal Sensor Module KY-028

Sensors
DET578
Part.No: KY-028
€2.50
Last items in stock
Immediate Dispatch
KY-028 Digital Temperature Thermal Sensor Module uses an NTC thermistor and LM393 comparator to deliver a clean digital switching output (0/1). Works with 3.3V–5V systems including Arduino and ESP32. Compact PCB (3.2×1.4 cm) with adjustable detection threshold.

 

The KY-028 Digital Temperature Thermal Sensor Module (MPN: KY-028) is a compact, easy-to-use thermal detection board designed for Arduino, ESP32, and similar microcontroller platforms. It combines an NTC thermistor for temperature sensing with an LM393 voltage comparator to output a clean digital HIGH/LOW signal whenever the ambient temperature crosses an adjustable threshold. Because the output is a simple digital switch, no ADC is required — the module connects directly to any digital input pin.

Key Features

  • NTC Thermistor Sensor: High sensitivity to temperature changes → reliable thermal event detection
  • LM393 Wide-Voltage Comparator: Produces a clean, stable digital waveform → noise-free signal for microcontrollers
  • Adjustable Detection Threshold: On-board potentiometer sets the trigger temperature → customisable for each application
  • Digital Switching Output (0 & 1): Direct connection to any digital GPIO → no ADC or library needed
  • Output Drive Capability >15 mA: Strong enough to drive LEDs or relay inputs directly → versatile in circuit design
  • Wide Supply Voltage 3.3 V–5 V: Compatible with both 5 V Arduino and 3.3 V ESP32/Raspberry Pi systems → no level-shifter required in most cases
  • Mounting Holes: Standard bolt holes on PCB → easy mechanical installation in enclosures
  • Compact PCB (3.2 × 1.4 cm): Small footprint → fits in tight spaces and breadboards

Pinout & Wiring

PINSymbolDescription
1GNDGround — connect to system GND
2VCCPower supply 3.3 V or 5 V
3DODigital Output — HIGH/LOW based on threshold comparison

Wiring note: Connect VCC and GND, then wire DO to any digital input pin on your microcontroller. Rotate the on-board potentiometer to set the desired temperature threshold. No pull-up resistor is needed as the LM393 output is already conditioned by the module.

Compatibility

  • Arduino UNO / Nano / Mega (5 V): Fully compatible — power from 5 V pin, connect DO directly to a digital pin.
  • ESP32 / ESP8266 / Raspberry Pi Pico (3.3 V): Fully compatible — power from 3.3 V pin, DO output is safe for 3.3 V GPIO.
  • Raspberry Pi (3.3 V GPIO): Compatible when powered at 3.3 V; DO connects to any GPIO input.

Typical Applications

  • Over-temperature alarm systems: Trigger a buzzer or LED when a device or enclosure exceeds a safe temperature limit.
  • Smart home automation: Use with Arduino or ESP32 to monitor room or appliance temperature and activate fans or relays.
  • Fire/heat detection prototypes: Quick detection of abnormal heat in DIY safety projects.
  • Educational projects: Ideal for learning how NTC thermistors and comparator circuits work in embedded systems.
  • Equipment protection circuits: Shut down motors or power supplies automatically when thermal thresholds are exceeded.

Technical Specifications

ParameterValue
InterfaceDigital switching output (0 / 1)
Operating Voltage3.3 V – 5 V DC
Output Drive Current> 15 mA
Sensor TypeNTC Thermistor
Comparator ICLM393 (wide voltage)
Threshold AdjustmentOn-board potentiometer
PCB Dimensions3.2 cm × 1.4 cm
MountingBolt holes
MPNKY-028

FAQ

Q: Does the KY-028 give an analog temperature reading?
A: No. The KY-028 outputs only a digital signal (HIGH or LOW) based on a user-set threshold. If you need a continuous analog or numeric temperature value, you will need a different sensor such as the DS18B20 or DHT22.

Q: How do I set the trigger temperature on the KY-028?
A: Rotate the on-board potentiometer with a small screwdriver. Turning it changes the comparator's reference voltage, which shifts the temperature point at which the DO output switches state.

Package Contents: 1 × KY-028 Digital Temperature Thermal Sensor Module

⚠ Note: This module provides threshold-based digital detection only, not a calibrated temperature measurement. Ensure supply voltage does not exceed 5 V to avoid damage to the LM393 comparator.
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