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| (15 mellanliggande sidversioner av 2 användare visas inte) |
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| == Om sensorn == | | ==Bild== |
| [[Fil:KY001.JPG]] | | [[Fil:KY001.JPG]] |
| '''DS18S20 Temperature chip
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| '''
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| == Koppling ==
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| Connect the signal to Arduino digital 10, and open serial port monitor:
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| | ==Om sensorn== |
| | TEMP 18B20 är en vanligt förekommande temperatursensor som använder [http://playground.arduino.cc/Learning/OneWire 1-wire protokollet]. |
| | Man behöver [http://arduino.cc/en/Guide/Libraries installera ett bibliotek] för att använda det, biblioteket hittar du [http://www.pjrc.com/teensy/arduino_libraries/OneWire.zip här] |
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| == Arduino exempelkod == | | ==Synonymer== |
| | KEYES Temp Module, KY001, Temperature Sensor Module, 01 ARDUINO DS18b20 sensor module |
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| <pre>
| | ==Koppling== |
| | När man kopplar in sensorn behöver man en sk. pullup på signalbussen, det funkar att sätta en 4,7kiloohms resistor mellan signal och +5v |
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| | ==Arduino exempelkod== |
| | När du installerat biblioteket kan du öppna exempelsketchen DS18x20_Temperature under File/Examples/OneWire/ |
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| #include
| | ==Bibliotek== |
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| | *[[Arduino]] |
| | *[[C]] |
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| /* DS18S20 Temperature chip i/o
| | [[Kategori:Elektronikrummet]] |
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| */
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| OneWire ds(10); // on pin 10
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| void setup(void) {
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| // initialize inputs/outputs
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| // start serial port
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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 data[12];
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| byte addr[8];
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| int Temp;
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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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| return;
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| }
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| Serial.print("R="); //R=28 Not sure what this is
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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 DS18S20 family device.n");
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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("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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| Temp=(data[1]<<8)+data[0];//take the two bytes from the response relating to temperature
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| Temp=Temp>>4;//divide by 16 to get pure celcius readout
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| //next line is Fahrenheit conversion
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| Temp=Temp*1.8+32; // comment this line out to get celcius
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| Serial.print("T=");//output the temperature to serial port
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| Serial.print(Temp);
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| Serial.print(" ");
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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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| </pre>
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| == Bibliotek ==
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| * [[Arduino]]
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| * [[C]]
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