Home SensorsKit Arduino and KY-001 Temperature sensor

Arduino and KY-001 Temperature sensor

by shedboy71

In this article, we connect an KY-001 Temperature sensor to an Arduino Uno

The Temperature Sensor is actually a DS18B20 digital thermometer

The DS18B20 digital thermometer provides 9-bit to 12-bit Celsius temperature measurements and has an alarm function with nonvolatile user-programmable upper and lower trigger points. The DS18B20 communicates over a 1-Wire bus that by definition requires only one data line (and ground) for communication with a central microprocessor. In addition, the DS18B20 can derive power directly from the data line (“parasite power”), eliminating the need for an external power supply.

Each DS18B20 has a unique 64-bit serial code, which allows multiple DS18B20s to function on the same 1-Wire bus. Thus, it is simple to use one microprocessor to control many DS18B20s distributed over a large area. Applications that can benefit from this feature include HVAC environmental controls, temperature monitoring systems inside buildings, equipment, or machinery, and process monitoring and control systems.

  • Unique 1-Wire® Interface Requires Only One Port Pin for Communication
  • Reduce Component Count with Integrated Temperature Sensor and EEPROM
    • Measures Temperatures from -55°C to +125°C (-67°F to +257°F)
    • ±0.5°C Accuracy from -10°C to +85°C
    • Programmable Resolution from 9 Bits to 12 Bits
    • No External Components Required
  • Parasitic Power Mode Requires Only 2 Pins for Operation (DQ and GND)
  • Simplifies Distributed Temperature-Sensing Applications with Multidrop Capability
    • Each Device Has a Unique 64-Bit Serial Code Stored in On-Board ROM

Here is the sensor

Parts Required

You can connect to the module using dupont style jumper wire.

This should work with other Arduino board – I have tried an Uno and Mega

Name   Link
Arduino Uno
37 in one sensor kit
Connecting cables



Pin 3 S
+ middle pin


Code Example

You will need the One Wire library and the Dallas Temperature control library – you can add these via the Arduino IDE. Links are also underneath

#include <OneWire.h>
#include <DallasTemperature.h>            

// input pin is declared to which the sensor module is connected
#define DS18b20 3

// Libraries are configured
OneWire oneWire(DS18b20);          
DallasTemperature sensors(&oneWire);    

void setup() {

    // Initialize serial output
    Serial.println("KY-001 temperature measurement");

    // Sensor is initialized

//main program loop
void loop()
    // Temperature measurement is started...
    // ... and output measured temperature
    Serial.print("Temperature: ");
    Serial.println(" °C");

    delay(1000); // 1s pause until next measurement


Serial Monitor Output

I was holding the sensor to get a variation in readings



OneWire Library

Dallas Temperature Control Library



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