Advertisement
Not a member of Pastebin yet?
Sign Up,
it unlocks many cool features!
- #include <OneWire.h>
- // DS18S20 Temperature chip i/o
- OneWire ds(10); // on pin 10
- void setup(void) {
- // initialize inputs/outputs
- // start serial port
- Serial.begin(9600);
- }
- void loop(void) {
- //For conversion of raw data to C
- int HighByte, LowByte, TReading, SignBit, Tc_100, Whole, Fract;
- byte i;
- byte present = 0;
- byte data[12];
- byte addr[8];
- if ( !ds.search(addr)) {
- Serial.print("No more addresses.\n");
- ds.reset_search();
- return;
- }
- Serial.print("R=");
- for( i = 0; i < 8; i++) {
- Serial.print(addr[i], HEX);
- Serial.print(" ");
- }
- if ( OneWire::crc8( addr, 7) != addr[7]) {
- Serial.print("CRC is not valid!\n");
- return;
- }
- if ( addr[0] == 0x10) {
- Serial.print("Device is a DS18S20 family device.\n");
- }
- else if ( addr[0] == 0x28) {
- Serial.print("Device is a DS18B20 family device.\n");
- }
- else {
- Serial.print("Device family is not recognized: 0x");
- Serial.println(addr[0],HEX);
- return;
- }
- ds.reset();
- ds.select(addr);
- ds.write(0x44,1); // start conversion, with parasite power on at the end
- delay(1000); // maybe 750ms is enough, maybe not
- // we might do a ds.depower() here, but the reset will take care of it.
- present = ds.reset();
- ds.select(addr);
- ds.write(0xBE); // Read Scratchpad
- Serial.print("P=");
- Serial.print(present,HEX);
- Serial.print(" ");
- for ( i = 0; i < 9; i++) { // we need 9 bytes
- data[i] = ds.read();
- Serial.print(data[i], HEX);
- Serial.print(" ");
- }
- Serial.print(" CRC=");
- Serial.print( OneWire::crc8( data, 8), HEX);
- Serial.println();
- //Conversion of raw data to C
- LowByte = data[0];
- HighByte = data[1];
- TReading = (HighByte << 8) + LowByte;
- SignBit = TReading & 0x8000; // test most sig bit
- if (SignBit) // negative
- {
- TReading = (TReading ^ 0xffff) + 1; // 2's comp
- }
- Tc_100 = (6 * TReading) + TReading / 4; // multiply by (100 * 0.0625) or 6.25
- Whole = Tc_100 / 100; // separate off the whole and fractional portions
- Fract = Tc_100 % 100;
- if (SignBit) // If its negative
- {
- Serial.print("-");
- }
- Serial.print(Whole);
- Serial.print(".");
- if (Fract < 10)
- {
- Serial.print("0");
- }
- Serial.print(Fract);
- Serial.print("\n");
- //End conversion to C
- }
Advertisement
Add Comment
Please, Sign In to add comment
Advertisement