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/2016/05/ks0023-keyestudio-18b20-temperature-sensor/
Datasheet
http://www.keyestudio.com/files/index/download/id/1463649511/
Get One Now
http://www.keyestudio.com/keyestudio-ds18b20-temperature-sensor.html