Ks0023 keyestudio 18B20 Temperature Sensor

18B20 Temperature Sensor

Introduction

DS18B20 is a digital temperature sensor. It can be used to quantify environmental temperature testing.
The temperature range is -55 ~ +125 ℃, inherent temperature resolution 0.5 ℃. It also support multi-point mesh networking.
The DS18B20 can be deployed to achieve multi-point temperature measurement. It has a 9-12 bit serial output. 

Specification

• Supply Voltage: 3.3V to 5V
• Temperature range: -55 °C to +125 °C
• Interface: Digital

Connection Diagram

Sample Code

OneWire Library Download: http://www.pjrc.com/teensy/arduino_libraries/OneWire.zip

#include <OneWire.h>
 int DS18S20_Pin = 2; //DS18S20 Signal pin on digital pin 2
 //Temperature chip i/o
OneWire ds(DS18S20_Pin);  // on digital pin 2
 void setup(void) {
  Serial.begin(9600);
}
 void loop(void) {
  float temperature = getTemp();
  Serial.println(temperature);
   
  delay(100); //to slow down the output so it is easier to read 
}
float getTemp(){
  //returns the temperature from one DS18S20 in DEG Celsius
 
  byte data[12];
  byte addr[8];
 
  if ( !ds.search(addr)) {
      //no more sensors on chain, reset search
      ds.reset_search();
      return -1000;
  }
 
  if ( OneWire::crc8( addr, 7) != addr[7]) {
      Serial.println("CRC is not valid!");
      return -1000;
  }
 
  if ( addr[0] != 0x10 && addr[0] != 0x28) {
      Serial.print("Device is not recognized");
      return -1000;
  }
 
  ds.reset();
  ds.select(addr);
  ds.write(0x44,1); // start conversion, with parasite power on at the end
 
  byte present = ds.reset();
  ds.select(addr);    
  ds.write(0xBE); // Read Scratchpad
 
  for (int i = 0; i < 9; i++) { // we need 9 bytes
    data[i] = ds.read();
  }
  ds.reset_search();
   
  byte MSB = data[1];
  byte LSB = data[0];
 
  float tempRead = ((MSB << 8) | LSB); //using two's compliment
  float TemperatureSum = tempRead / 16;  
  return TemperatureSum;
}

Extension

You can use this keyestudio 18B20 Temperature Sensor to detect the temperture of current environment, displaying the value on the LCD.

Resources

• Video
  

http://video.keyestudio.com/ks0023/

• Libraries
  

https://fs.keyestudio.com/KS0023

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