This is the code I wrote to make a thermometer with DS18B20, Arduino UNO and LCD. Hope it helps.
#include <
LiquidCrystal.h>
#include <
OneWire.h>
int DS18S20_Pin = 7; //DS18S20 Signal pin on digital 7
//Temperature chip i/o
OneWire ds(DS18S20_Pin); // on digital pin 7
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
void setup(void) {
Serial.begin(9600);
lcd.begin(16, 2); // set up the LCD's number of columns and rows:
}
void loop(void) {
float temperature = getTemp();
if(temperature==-1000)
{
lcd.clear();
lcd.print("Error");
}
else{
lcd.clear();
lcd.print("**Temperature**");
float farenhiet=temperature+33.8;
Serial.println(temperature);
lcd.setCursor(0,1);
lcd.print(temperature);//Show the temperature in LCD
lcd.print((char)223);// command for printing ° sign in LCD Ref:
Was wondering how I can correctly print the Celsius degree symbol ° with LiquidCrystalLCD I tried with lcd.print( "°C"); but I read a non-sense char. Thanks in advance
lcd.print("C");// C for Celcius
lcd.setCursor(9,1);
lcd.print(farenhiet);//Show the temperature in LCD
lcd.print((char)223);// command for printing ° sign in LCD Ref:
Was wondering how I can correctly print the Celsius degree symbol ° with LiquidCrystalLCD I tried with lcd.print( "°C"); but I read a non-sense char. Thanks in advance
lcd.print("F");// C for Celcius
delay(50); //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
= 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;
}