HS-S24A Digital Temperature Sensor - Threshold Temperature Detection Module for Arduino Projects The HS-S24A Digital Temperature Sensor module is a simple temperature-trigger input board for alarms, thermostat demos, fan control, and classroom electronics. It is intended for detecting whether temperature crosses a threshold rather than providing high-resolution calibrated digital thermometer data. The module can be used with Arduino-compatible boards such as the ELAB Nano V3, output devices such as the RGB Full Color LED Module, and relay-control experiments using the KeyeStudio EASY PLUG RJ11 Single Relay Module. For precise 1-Wire temperature measurement, compare it with the DS18B20 digital temperature sensor. Use this board where a digital threshold is enough, such as turning on a fan when a module warms up. If the board exposes an analog output, calibrate it in software against a known thermometer before using it for numeric display. Technical Specifications Parameter Value SKU HS-S24A Product Type Digital temperature sensor module Sensing Element Thermistor-style temperature detection circuit Output Digital threshold signal; analog availability depends on board version Typical Supply 3.3V / 5V controller systems Interface VCC, GND, signal pins per module label Use Cases Thermal alarms, fan triggers, thermostat demos Host Requirement GPIO input for digital mode Calibration Recommended if reading analog temperature Comparison Product Use DS18B20 when calibrated digital temperature is required Board Layout & Label Guide Temperature Sensor - Sensing element that responds to local board temperature. Digital Output - Threshold signal to the controller. VCC - Power input. GND - Common ground. Adjuster - Some modules include a threshold potentiometer. Indicator LED - Shows output state on many comparator modules. Placement Note - Mount near the target heat source but away from direct shorts or hot metal. Calibration Note - Set threshold in the final enclosure. Application Scenarios 1. Arduino Overheat LED Turn on an LED when the digital output triggers. const int tempPin = 2; const int ledPin = 13; void setup() { pinMode(tempPin, INPUT); pinMode(ledPin, OUTPUT); } void loop() { digitalWrite(ledPin, digitalRead(tempPin)); } 2. Fan Relay Control Drive a fan relay when temperature threshold is reached. const int tempPin = 2; const int relayPin = 7; void setup() { pinMode(tempPin, INPUT); pinMode(relayPin, OUTPUT); } void loop() { digitalWrite(relayPin, digitalRead(tempPin)); } 3. MicroPython Threshold Read Read the digital threshold from a Pico-style board. from machine import Pin import time temp = Pin(15, Pin.IN) while True: print("hot" if temp.value() else "normal") time.sleep(0.5) Packing List 1 x HS-S24A Digital Temperature Sensor Module FAQ Q: Is this the same as DS18B20?A: No, this is a threshold-style temperature module, while DS18B20 is a 1-Wire digital thermometer. Q: Does it output exact temperature?A: Use it mainly for threshold detection unless your board exposes and calibrates analog output. Q: Can it control a fan?A: Yes, through a relay or driver circuit. Q: Can I adjust the threshold?A: Many similar modules include a potentiometer; check the actual board. Q: Can I use it with Arduino?A: Yes, connect the digital output to a GPIO. Q: Where should I mount it?A: Near the target heat source, while keeping electronics safe. Q: Why does it chatter near threshold?A: Add hysteresis in software or adjust the threshold away from the boundary. Q: What should I verify first?A: Power, ground, output polarity, and threshold behavior.
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