4 Pin NTC Thermistor Temperature Sensor Module

4 Pin NTC Thermistor Temperature Sensor Module is a highly convenient and accurate solution for digital temperature acquisition in embedded systems. This module packages a sensitive NTC (Negative Temperature Coefficient) thermistor along with a comparator and an adjustable potentiometer onto a compact PCB, which significantly streamlines the process of integrating thermal monitoring into your projects. Consequently, this design allows the module to output both an analog voltage proportional to the temperature and a digital signal for threshold detection. Furthermore, its included mounting hole and straightforward 4-pin interface make connecting and securing the sensor assembly remarkably simple. Engineers and hobbyists therefore rely on this module for reliable, cost-effective temperature sensing across diverse applications, from environmental control to safety monitoring.

Key Features:

• Dual Output Capability: Provides both a real-time analog voltage output and a digital switch output (DO) triggered by a user-defined temperature threshold.
• NTC Thermistor Sensor: Utilizes an NTC thermistor element, which delivers high sensitivity and fast response times to temperature changes.
• Adjustable Threshold: Includes an onboard potentiometer, allowing users to precisely set the temperature point at which the digital output signal changes state.
• Wide Operating Voltage: The module operates reliably across a common supply range, typically from 3.3 V to 5 V DC.
• LED Indicators: Features power and digital output status LEDs for immediate visual confirmation during setup and operation.

Technical Specifications:

• Sensor Element: NTC Thermistor (Typically 10 kΩ at 25°C)
• Operating Voltage (V_CC): 3.3 V to 5 V DC
• Output Type: Analog (AO) and Digital (DO)
• Temperature Measurement Range: Typically −30°C to +100°C (Component dependent)
• Digital Output Current: 15 mA (Source/Sink)
• PCB Comparator IC: Often uses the LM393 voltage comparator or an equivalent.

Mechanical Specifications:

• Package Type: Small PCB Module with 4-pin header
• Mounting: Includes one standard M3 mounting hole for secure attachment.
• Connector: Standard 2.54 mm pitch 4-pin male header.
• Dimensions (PCB): ≈ 32 mm x 14 mm

Dimensions:

• Module Length: ≈ 32 mm
• Module Width: ≈ 14 mm
• Thermistor Probe Length: Varies (Often 10 mm to 20 mm)
• Mounting Hole Diameter: ≈ 3 mm

Pinout and Wiring:

• VCC: Connect to the positive power supply (typically 3.3V or 5V).
• GND: Connect to the circuit ground (0 V).
• DO (Digital Output): Connect to a digital input pin on a microcontroller (MCU). This pin outputs HIGH or LOW based on the comparator threshold setting.
• AO (Analog Output): Connect to an Analog-to-Digital Converter (ADC) input pin on an MCU to read the continuous temperature value.

Datasheet Reference:

• Download LM393 Comparator IC Datasheet (Commonly used on this module)

Commonly Used in:

• Prototyping Platforms: Directly compatible with Arduino, Raspberry Pi, and other development boards.
• Hygrothermographs: Integrated into DIY devices for logging temperature and humidity.
• HVAC Systems: Employed in simple controllers for basic fan or heater switching based on ambient temperature.

Applications:

• Temperature Monitoring: Continuously measures ambient or localized temperature using the analog output.
• Thermal Alarm System: The digital output creates a simple, effective high-temperature or low-temperature warning system when integrated with an alert mechanism.
• Cooling System Activation: Automatically triggers a cooling fan or heat sink element when the temperature exceeds the set threshold.

Equivalent Models:

• DS18B20 Module: A digital temperature sensor module (though not a thermistor, it performs the same function) used for comparison in many tutorials.
• KY-013 Module: A smaller, functionally similar analog temperature module sometimes offered as an alternative.
• Thermistor on Breakout: Any standard NTC thermistor combined with a voltage divider circuit and comparator (such as the LM393) forms a functional equivalent.

Package Includes:

• 1 x 4 Pin NTC Thermistor Temperature Sensor Module