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113 lines
3.0 KiB
113 lines
3.0 KiB
3 years ago
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#include <OneWire.h>
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// OneWire DS18S20, DS18B20, DS1822 Temperature Example
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//
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// http://www.pjrc.com/teensy/td_libs_OneWire.html
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//
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// The DallasTemperature library can do all this work for you!
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// https://github.com/milesburton/Arduino-Temperature-Control-Library
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OneWire ds(10); // on pin 10 (a 4.7K resistor is necessary)
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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;
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byte present = 0;
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byte type_s;
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byte data[12];
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byte addr[8];
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float celsius, fahrenheit;
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if ( !ds.search(addr)) {
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Serial.println("No more addresses.");
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Serial.println();
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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("ROM =");
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for( i = 0; i < 8; i++) {
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Serial.write(' ');
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Serial.print(addr[i], HEX);
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}
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if (OneWire::crc8(addr, 7) != addr[7]) {
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Serial.println("CRC is not valid!");
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return;
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}
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Serial.println();
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// the first ROM byte indicates which chip
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switch (addr[0]) {
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case 0x10:
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Serial.println(" Chip = DS18S20"); // or old DS1820
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type_s = 1;
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break;
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case 0x28:
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Serial.println(" Chip = DS18B20");
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type_s = 0;
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break;
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case 0x22:
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Serial.println(" Chip = DS1822");
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type_s = 0;
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break;
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default:
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Serial.println("Device is not a DS18x20 family device.");
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return;
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}
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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(" Data = ");
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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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Serial.print(" CRC=");
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Serial.print(OneWire::crc8(data, 8), HEX);
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Serial.println();
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// Convert the data to actual temperature
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// because the result is a 16 bit signed integer, it should
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// be stored to an "int16_t" type, which is always 16 bits
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// even when compiled on a 32 bit processor.
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int16_t raw = (data[1] << 8) | data[0];
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if (type_s) {
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raw = raw << 3; // 9 bit resolution default
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if (data[7] == 0x10) {
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// "count remain" gives full 12 bit resolution
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raw = (raw & 0xFFF0) + 12 - data[6];
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}
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} else {
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byte cfg = (data[4] & 0x60);
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// at lower res, the low bits are undefined, so let's zero them
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if (cfg == 0x00) raw = raw & ~7; // 9 bit resolution, 93.75 ms
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else if (cfg == 0x20) raw = raw & ~3; // 10 bit res, 187.5 ms
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else if (cfg == 0x40) raw = raw & ~1; // 11 bit res, 375 ms
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//// default is 12 bit resolution, 750 ms conversion time
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}
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celsius = (float)raw / 16.0;
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fahrenheit = celsius * 1.8 + 32.0;
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Serial.print(" Temperature = ");
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Serial.print(celsius);
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Serial.print(" Celsius, ");
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Serial.print(fahrenheit);
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Serial.println(" Fahrenheit");
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}
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