77 lines
1.6 KiB
Arduino
77 lines
1.6 KiB
Arduino
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#include "OneWire.h"
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OneWire ds(7); // on pin 7
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void setup(void) {
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Serial.begin(9600);
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}
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void loop(void) {
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byte i, temp, temp_fraction;
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byte present = 0;
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byte data[12];
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byte addr[8];
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double realtemp = 0.0f;
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if ( !ds.search(addr)) {
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Serial.print("No more addresses.\n");
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ds.reset_search();
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delay(250);
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return;
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}
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Serial.print("R=");
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for( i = 0; i < 8; i++) {
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Serial.print(addr[i], HEX);
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Serial.print(" ");
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}
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if ( OneWire::crc8( addr, 7) != addr[7]) {
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Serial.print("CRC is not valid!\n");
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return;
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}
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if ( addr[0] != 0x28) {
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Serial.print("Device is not a DS18B20 family device.\n");
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return;
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}
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// The DallasTemperature library can do all this work for you!
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ds.reset();
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ds.select(addr);
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ds.write(0x44,1); // start conversion, with parasite power on at the end
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delay(1000); // maybe 750ms is enough, maybe not
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// we might do a ds.depower() here, but the reset will take care of it.
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present = ds.reset();
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ds.select(addr);
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ds.write(0xBE); // Read Scratchpad
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Serial.print("P=");
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Serial.print(present,HEX);
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Serial.print(" ");
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for ( i = 0; i < 9; i++) { // we need 9 bytes
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data[i] = ds.read();
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Serial.print(data[i], HEX);
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Serial.print(" ");
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}
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if (data[1]== 0b11111000) {
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Serial.print("-");
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}
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else {
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Serial.print("+");
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}
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temp = (data[1] & 0b00000111) << 4;
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temp = ((data[0] & 0b11110000) >> 4) | temp;
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realtemp = (double)temp + ((double) (data[0] & 0b00001111) * 0.0625);
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Serial.print(realtemp);
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Serial.print(" CRC=");
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Serial.print( OneWire::crc8( data, 8), HEX);
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Serial.println();
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}
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