Ks0023 keyestudio 18B20 Temperature Sensor
18B20 Temperature Sensor
Introduction
DS18B20 is a digital temperature sensor. It can be used for quantify environmental temperature testing. The temperature range is from -55 to +125 ℃, inherent temperature resolution 0.5 ℃. It also support multi-point mesh networking. Three DS18B20 can be deployed on three lines 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 ~ +125 °C
- Interface: Digital
- Size: 30*20mm
- Weight: 3g
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; }
Resources
Video
http://www.keyestudio.com/wp/ks0023/
https://drive.google.com/open?id=1ucy2n_wiamR_-lxg894WhyCj5Xr1bjVL
Libraries
https://drive.google.com/open?id=1WGOc-cQYzeMWHGnNjJWSM6tv6Dief0UD
Get One Now
Official Website
http://www.keyestudio.com/keyestudio-ds18b20-temperature-sensor.html