I am trying to figure out how to convert the Celsius temp to a Farenheit reading. Any help would be great. Thanks
//Initial I2C LCD example from:
// http://arduino-info.wikispaces.com/LCD-Blue-I2C
// Initial DS18B20 example from:
// http://bildr.org/2011/07/ds18b20-arduino/
// Read the DS18B20 and then write to an I2C LCD and serial monitor
// Arduino + DS18B20 + I2C LCD — www.HOAGLUN.com
#include <Wire.h>
#include <OneWire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x3F,20,4); // set the LCD address to 0x27 for a 16 chars and 2 line display
int DS18S20_Pin = 10; //DS18S20 Signal pin on digital 2
//Temperature chip i/o
OneWire ds(DS18S20_Pin); // on digital pin 2
void setup(void) {
Serial.begin(9600);
lcd.init(); // initialize the lcd
// Print a message to the LCD.
lcd.backlight();
lcd.setCursor(0, 0);
lcd.print("Reef Controller");
// lcd.setCursor(0, 1);
// lcd.print("Second Line");
}
void loop(void) {
float temperature = getTemp();
Serial.println(temperature);
lcd.setCursor(0, 1);
lcd.print(temperature);
delay(500); //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;*
}