LM393 NTC Thermistor Thermal Sensor Module 4 Pin (Temperature up to 80 degree Celsius)

LM393 NTC Thermistor Thermal Sensor Module (4-Pin, up to 80°C) is a precise temperature-sensing circuit board designed for ambient and surface thermal monitoring. Combining a high-sensitivity NTC (Negative Temperature Coefficient) thermistor probe with an LM393 dual differential voltage comparator, this module provides both analog output (for continuous temperature readings) and digital output (with an adjustable trip threshold set via an onboard potentiometer). It is an ideal, cost-effective solution for temperature-triggered alarms, cooling fan controls, incubator thermal management, and microcontroller-based environmental monitoring.

Features

• Dual output capability: Analog voltage output (AO) for continuous data tracking and Digital threshold output (DO) for direct switching
• Equipped with the reliable LM393 voltage comparator chip ensuring stable and responsive signal conversion
• High-precision NTC thermistor probe reacting rapidly to ambient and contact temperature changes
• Onboard multi-turn precision potentiometer for adjusting the digital trigger temperature threshold (sensitivity)
• Dual LED indicators: Power LED (red) and Digital output switch status LED (green)
• Wide operating voltage range (3.3V to 5V DC), directly compatible with Arduino, ESP32, and Raspberry Pi logic levels
• Easy-to-use 4-pin interface with clear pinout markings for effortless breadboard or wire hookup
• Compact PCB size with pre-drilled mounting holes for secure enclosure installation

Applications

• Temperature-controlled cooling fan systems for enclosures, power supplies, and electronics racks
• Thermal protection alerts and automated fire/overheat warning alarms
• Incubation chambers, poultry farm temperature monitoring, and greenhouse climate control
• HVAC testing, domestic appliance thermal monitoring, and smart home automation
• Polytechnic diploma, university engineering thesis, and Arduino/ESP32 IoT environmental monitoring projects

Important Notes:

• Temperature Limit: This standard NTC module is rated for temperatures up to 80°C; do not expose the plastic/epoxy thermistor probe or board directly to open flames or temperatures exceeding 80°C to avoid permanent damage.
• To read precise temperature values, connect the Analog Output (AO) pin to a microcontroller's analog-to-digital converter (ADC) pin and apply the Steinhart-Hart equation or a lookup calibration curve.
• The digital output (DO) pin goes LOW or HIGH (depending on board design) when the temperature crosses the threshold set by turning the onboard blue potentiometer.
• Ensure correct power supply polarity (VCC to 3.3V/5V, GND to Ground); reverse connections can damage the LM393 IC.

Package includes

• 1 x LM393 NTC Thermistor Thermal Sensor Module (4-Pin)