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kaklik |
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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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// http://milesburton.com/Dallas_Temperature_Control_Library |
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OneWire ds(10); // on pin 10 |
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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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unsigned int 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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if (cfg == 0x00) raw = raw << 3; // 9 bit resolution, 93.75 ms |
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else if (cfg == 0x20) raw = raw << 2; // 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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} |