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18B20 Temperature Sensor V2
SKU:DFR0024
18B20 Temperature Sensor V2 SKU: DFR0024
[[category: Diagram]] [[category: DFRobot]]-->
Contents [hide]
1 Introduction
2 Specification
3 Connection Diagram
4 Sample Code
5 Version History
Introduction
DS18B20 is a digital temperature sensor which is
from DALLAS U.S. It can be used to quantify the
environmental temperature testing.
The temperature range -55 ~ +125 ℃, the inherent
temperature resolution of 0.5 ℃, support multi-
point networking mesh. Three DS18B20 can
deloyed 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:22x32mm
Connection Diagram
Sample Code
#include
int DS18S20_Pin = 2; //DS18S20 Signal pin on digital 2
//Temperature chip i/o
Search
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); //just here 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;
}
Version History
18B20 Temperature Sensor V1_SKU: DFR0024
Go Shopping 18B20 Temerature Sensor (Arduino Compatible) SKU:DFR0024
Category: Home > Modules&Sensors > Sensors > Temperature Sensors
Categories: Product Manual DFR Series Sensors
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This page was last modified on 9 June 2017, at 09:13.
