{"product_id":"ky-028-digital-temperature-sensor-module-ntc-lm393-for-arduino","title":"KY-028 Digital Temperature Sensor Module – NTC LM393 for Arduino","description":"\n\u003ch2\u003eKY-028 Digital Temperature Sensor Module with LM393 for Arduino\u003c\/h2\u003e\n\n\u003cp\u003eBuy the \u003cstrong\u003eKY-028 Digital Temperature Sensor Module with LM393\u003c\/strong\u003e online in Pakistan from \u003cstrong\u003eRobostan.pk\u003c\/strong\u003e. This compact temperature detection module features an NTC thermistor, an LM393 comparator, adjustable temperature threshold control, and both analog and digital outputs.\u003c\/p\u003e\n\n\u003cp\u003eDesigned for \u003cstrong\u003eArduino, ESP32, Raspberry Pi, robotics, IoT, and DIY electronics projects\u003c\/strong\u003e, the KY-028 is suitable for monitoring temperature changes and detecting when a selected temperature threshold is reached.\u003c\/p\u003e\n\n\u003cp\u003eThe module uses a Negative Temperature Coefficient (NTC) thermistor whose electrical resistance decreases as temperature increases. Its analog output provides a temperature-dependent signal, while the LM393 comparator generates a digital switching output based on the threshold adjusted using the onboard potentiometer.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eKY-028 NTC temperature sensing module\u003c\/li\u003e\n\u003cli\u003eIntegrated LM393 voltage comparator\u003c\/li\u003e\n\u003cli\u003eAnalog temperature sensing output (AO)\u003c\/li\u003e\n\u003cli\u003eDigital temperature threshold output (DO)\u003c\/li\u003e\n\u003cli\u003eAdjustable threshold using onboard potentiometer\u003c\/li\u003e\n\u003cli\u003eTypical operating voltage of 3.3V to 5V DC\u003c\/li\u003e\n\u003cli\u003eNTC thermistor with resistance decreasing as temperature increases\u003c\/li\u003e\n\u003cli\u003eCommonly specified thermistor sensing range of -55°C to +125°C\u003c\/li\u003e\n\u003cli\u003eFour-pin interface for simple microcontroller connections\u003c\/li\u003e\n\u003cli\u003eOnboard power and threshold indicator LEDs\u003c\/li\u003e\n\u003cli\u003eCompatible with Arduino UNO, Nano and Mega\u003c\/li\u003e\n\u003cli\u003eSuitable for ESP32 and STM32 with appropriate connections\u003c\/li\u003e\n\u003cli\u003eUsable with Raspberry Pi through digital GPIO or external ADC\u003c\/li\u003e\n\u003cli\u003eCompact PCB design for embedded applications\u003c\/li\u003e\n\u003cli\u003eSuitable for temperature alarm and monitoring projects\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e KY-028 Digital Temperature Sensor Module\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel Number:\u003c\/strong\u003e KY-028\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor Type:\u003c\/strong\u003e NTC Thermistor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComparator IC:\u003c\/strong\u003e LM393\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupply Voltage:\u003c\/strong\u003e Typically 3.3V to 5V DC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNominal Thermistor Range:\u003c\/strong\u003e -55°C to +125°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput Type:\u003c\/strong\u003e Analog and Digital\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnalog Output:\u003c\/strong\u003e Temperature-Dependent Voltage\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDigital Output:\u003c\/strong\u003e Comparator-Based HIGH\/LOW Signal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThreshold Adjustment:\u003c\/strong\u003e Onboard Potentiometer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndicator LEDs:\u003c\/strong\u003e Power and Detection Status\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterface:\u003c\/strong\u003e Four-Pin Header\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePin Labels:\u003c\/strong\u003e AO, GND, VCC and DO (depending on PCB layout)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasurement Principle:\u003c\/strong\u003e NTC Resistance Variation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDigital Threshold:\u003c\/strong\u003e Adjustable\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Controllers:\u003c\/strong\u003e Arduino, ESP32, STM32 and Raspberry Pi with Suitable Interfacing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Type:\u003c\/strong\u003e PCB Sensor Module\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eArduino temperature monitoring projects\u003c\/li\u003e\n\u003cli\u003eTemperature threshold detection\u003c\/li\u003e\n\u003cli\u003eOvertemperature warning prototypes\u003c\/li\u003e\n\u003cli\u003eTemperature-triggered fan control\u003c\/li\u003e\n\u003cli\u003eRobotics and automation systems\u003c\/li\u003e\n\u003cli\u003eESP32 IoT temperature monitoring\u003c\/li\u003e\n\u003cli\u003eElectronic thermostat experiments\u003c\/li\u003e\n\u003cli\u003eTemperature alarm circuits\u003c\/li\u003e\n\u003cli\u003eSmart home monitoring prototypes\u003c\/li\u003e\n\u003cli\u003eEducational sensor experiments\u003c\/li\u003e\n\u003cli\u003eMicrocontroller analog input projects\u003c\/li\u003e\n\u003cli\u003eEmbedded electronics temperature sensing\u003c\/li\u003e\n\u003cli\u003eHeating and cooling control demonstrations\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow Does the KY-028 Temperature Sensor Work?\u003c\/h3\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eKY-028 Temperature Sensor\u003c\/strong\u003e measures temperature changes using an NTC thermistor.\u003c\/p\u003e\n\n\u003cp\u003eAs temperature increases, the thermistor resistance decreases. The module converts this resistance change into an analog voltage signal.\u003c\/p\u003e\n\n\u003cp\u003eThe analog signal can be read through the analog-to-digital converter (ADC) of a compatible microcontroller.\u003c\/p\u003e\n\n\u003cp\u003eThe KY-028 also includes an LM393 comparator that compares the temperature-dependent signal with an adjustable reference voltage.\u003c\/p\u003e\n\n\u003cp\u003eWhen the comparator threshold is crossed, the digital output changes state. This allows the controller to detect a temperature event without continuously calculating an exact temperature value.\u003c\/p\u003e\n\n\u003ch3\u003eDual Analog and Digital Outputs\u003c\/h3\u003e\n\n\u003cp\u003eThe KY-028 provides two output options:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAO (Analog Output):\u003c\/strong\u003e Produces a voltage that varies with thermistor temperature. A controller can convert the reading into an estimated temperature using suitable calibration and thermistor equations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDO (Digital Output):\u003c\/strong\u003e Produces a HIGH or LOW signal when the adjustable threshold is crossed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eThe analog output is useful for temperature measurement experiments, while the digital output is convenient for alarms and temperature-triggered switching.\u003c\/p\u003e\n\n\u003ch3\u003eAdjustable Temperature Threshold\u003c\/h3\u003e\n\n\u003cp\u003eThe onboard potentiometer allows users to adjust the comparison threshold of the LM393 circuit.\u003c\/p\u003e\n\n\u003cp\u003eBy rotating the potentiometer, the switching point can be selected for an electronic alarm, notification system, or suitable control circuit.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e The potentiometer does not directly display or set a calibrated temperature in degrees Celsius. Use a thermometer and suitable calibration procedure when a specific switching temperature is required.\u003c\/p\u003e\n\n\u003ch3\u003eKY-028 Module Pinout\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAO:\u003c\/strong\u003e Analog temperature-dependent output\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGND:\u003c\/strong\u003e Ground connection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVCC:\u003c\/strong\u003e Positive DC supply voltage\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDO:\u003c\/strong\u003e Digital temperature-threshold output\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003ePin order varies between manufacturers. Follow the markings printed on the actual PCB before connecting the module.\u003c\/p\u003e\n\n\u003ch3\u003eArduino Compatibility\u003c\/h3\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eKY-028 LM393 Temperature Sensor Module\u003c\/strong\u003e is compatible with Arduino UNO, Nano, Mega and other suitable development boards.\u003c\/p\u003e\n\n\u003cp\u003eA typical Arduino UNO connection is:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eKY-028 VCC:\u003c\/strong\u003e Arduino 5V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKY-028 GND:\u003c\/strong\u003e Arduino GND\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKY-028 AO:\u003c\/strong\u003e Arduino A0\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKY-028 DO:\u003c\/strong\u003e Arduino D3\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eThe Arduino can use \u003cstrong\u003eanalogRead()\u003c\/strong\u003e to monitor analog voltage changes and \u003cstrong\u003edigitalRead()\u003c\/strong\u003e to detect the comparator output state.\u003c\/p\u003e\n\n\u003cp\u003eFor example, the module can activate a buzzer or LED when a temperature threshold is crossed.\u003c\/p\u003e\n\n\u003ch3\u003eESP32 and Raspberry Pi Compatibility\u003c\/h3\u003e\n\n\u003cp\u003eThe KY-028 can be integrated with ESP32 and other compatible 3.3V microcontrollers using suitable voltage levels.\u003c\/p\u003e\n\n\u003cp\u003eFor Raspberry Pi applications, its digital output can be monitored using a GPIO input.\u003c\/p\u003e\n\n\u003cp\u003eReading the analog output with a standard Raspberry Pi requires an external ADC, such as an MCP3008 or ADS1115, because Raspberry Pi GPIO pins do not provide built-in analog inputs.\u003c\/p\u003e\n\n\u003ch3\u003eKY-028 vs KY-013 Temperature Sensor\u003c\/h3\u003e\n\n\u003cp\u003eThe KY-028 and KY-013 both use NTC thermistors but offer different features.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eKY-013:\u003c\/strong\u003e Simple three-pin analog temperature sensor module.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKY-028:\u003c\/strong\u003e Four-pin temperature sensor module with analog output, LM393 comparator, adjustable threshold and digital output.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eChoose the KY-028 when a temperature threshold indicator or digital switching output is needed alongside analog temperature information.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Choose the KY-028?\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003eDual Output:\u003c\/strong\u003e Provides both analog temperature information and digital threshold detection.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAdjustable Switching Point:\u003c\/strong\u003e The onboard potentiometer allows threshold adjustment without modifying program code.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eSimple Integration:\u003c\/strong\u003e Connects to common microcontrollers through analog and digital inputs.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCompact Design:\u003c\/strong\u003e Suitable for small electronic circuits and prototyping projects.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eEducational Value:\u003c\/strong\u003e Useful for learning about NTC thermistors, voltage dividers, comparators and temperature control.\u003c\/p\u003e\n\n\u003ch3\u003eImportant Usage Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThe KY-028 is an NTC thermistor module with an LM393 comparator.\u003c\/li\u003e\n\u003cli\u003eThe digital output indicates threshold crossing; it does not provide a numerical temperature reading.\u003c\/li\u003e\n\u003cli\u003eThe analog output requires suitable calibration for temperature conversion.\u003c\/li\u003e\n\u003cli\u003eMeasurement accuracy depends on thermistor tolerances, circuit components and calibration.\u003c\/li\u003e\n\u003cli\u003eDo not assume the entire PCB assembly is rated for continuous use at 125°C.\u003c\/li\u003e\n\u003cli\u003eThe module is not waterproof and is not intended for immersion in liquids.\u003c\/li\u003e\n\u003cli\u003eUse suitable voltage levels for 3.3V-only microcontrollers.\u003c\/li\u003e\n\u003cli\u003eVerify the actual board pinout and digital output polarity before use.\u003c\/li\u003e\n\u003cli\u003eDo not connect the module directly to AC mains.\u003c\/li\u003e\n\u003cli\u003eDo not connect high-current loads directly to the sensor outputs.\u003c\/li\u003e\n\u003cli\u003eFor motor or fan control, use a suitable external driver or relay module.\u003c\/li\u003e\n\u003cli\u003eThis hobby module should not be the sole protective device in safety-critical temperature systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePackage Contents\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 x KY-028 Digital Temperature Sensor Module with LM393\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eBuy KY-028 Digital Temperature Sensor in Pakistan\u003c\/h3\u003e\n\n\u003cp\u003eLooking for a \u003cstrong\u003eKY-028 Digital Temperature Sensor Module with LM393 in Pakistan\u003c\/strong\u003e? Shop online at \u003cstrong\u003eRobostan.pk\u003c\/strong\u003e for Arduino sensors, NTC thermistor modules, ESP32 accessories, Raspberry Pi components, robotics parts and electronics project supplies.\u003c\/p\u003e\n\n\u003cp\u003eThe KY-028 is suitable for students, engineers, makers and electronics enthusiasts developing temperature sensing and automation projects.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eOrder your KY-028 LM393 Temperature Sensor Module from Robostan.pk\u003c\/strong\u003e with nationwide delivery across Pakistan, including Lahore, Karachi, Islamabad, Rawalpindi, Faisalabad, Multan, Peshawar and other cities.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eRobostan.pk – Build. Innovate. Create.\u003c\/strong\u003e\u003c\/p\u003e\n","brand":"ROBOSTAN","offers":[{"title":"Default Title","offer_id":68380299460974,"sku":null,"price":180.0,"currency_code":"PKR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1019\/7391\/8062\/files\/ChatGPTImageNov13_2026_08_20_22PM-3.png?v=1794650376","url":"https:\/\/robostan.pk\/products\/ky-028-digital-temperature-sensor-module-ntc-lm393-for-arduino","provider":"ROBOSTAN","version":"1.0","type":"link"}