Arduino and KY-001 Temperature sensor

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		Aliexpress link Amazon Ebay
37 in one sensor kit		Aliexpress link Amazon link
Connecting cables		Aliexpress link Amazon Ebay

 

Schematic/Connection

ARDUINO	SENSOR
Pin 3	S
+	middle pin
GND	GND

 

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.begin(9600);
    Serial.println("KY-001 temperature measurement");

    // Sensor is initialized
    sensors.begin();  
}

//main program loop
void loop()
{
    // Temperature measurement is started...
    sensors.requestTemperatures();
    // ... and output measured temperature
    Serial.print("Temperature: ");
    Serial.print(sensors.getTempCByIndex(0));
    Serial.println(" °C");

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

 

Serial Monitor Output

I was holding the sensor to get a variation in readings

 

Links

OneWire Library

Dallas Temperature Control Library