| 0,0 → 1,109 |
|---|
| #include <OneWire.h> |
| |
| // OneWire DS18S20, DS18B20, DS1822 Temperature Example |
| // |
| // http://www.pjrc.com/teensy/td_libs_OneWire.html |
| // |
| // The DallasTemperature library can do all this work for you! |
| // http://milesburton.com/Dallas_Temperature_Control_Library |
| |
| OneWire ds(10); // on pin 10 |
| |
| void setup(void) { |
| Serial.begin(9600); |
| } |
| |
| void loop(void) { |
| byte i; |
| byte present = 0; |
| byte type_s; |
| byte data[12]; |
| byte addr[8]; |
| float celsius, fahrenheit; |
| |
| if ( !ds.search(addr)) { |
| Serial.println("No more addresses."); |
| Serial.println(); |
| ds.reset_search(); |
| delay(250); |
| return; |
| } |
| |
| Serial.print("ROM ="); |
| for( i = 0; i < 8; i++) { |
| Serial.write(' '); |
| Serial.print(addr[i], HEX); |
| } |
| |
| if (OneWire::crc8(addr, 7) != addr[7]) { |
| Serial.println("CRC is not valid!"); |
| return; |
| } |
| Serial.println(); |
| |
| // the first ROM byte indicates which chip |
| switch (addr[0]) { |
| case 0x10: |
| Serial.println(" Chip = DS18S20"); // or old DS1820 |
| type_s = 1; |
| break; |
| case 0x28: |
| Serial.println(" Chip = DS18B20"); |
| type_s = 0; |
| break; |
| case 0x22: |
| Serial.println(" Chip = DS1822"); |
| type_s = 0; |
| break; |
| default: |
| Serial.println("Device is not a DS18x20 family device."); |
| 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(" Data = "); |
| 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(); |
| |
| // convert the data to actual temperature |
| |
| unsigned int raw = (data[1] << 8) | data[0]; |
| if (type_s) { |
| raw = raw << 3; // 9 bit resolution default |
| if (data[7] == 0x10) { |
| // count remain gives full 12 bit resolution |
| raw = (raw & 0xFFF0) + 12 - data[6]; |
| } |
| } else { |
| byte cfg = (data[4] & 0x60); |
| if (cfg == 0x00) raw = raw << 3; // 9 bit resolution, 93.75 ms |
| else if (cfg == 0x20) raw = raw << 2; // 10 bit res, 187.5 ms |
| else if (cfg == 0x40) raw = raw << 1; // 11 bit res, 375 ms |
| // default is 12 bit resolution, 750 ms conversion time |
| } |
| celsius = (float)raw / 16.0; |
| fahrenheit = celsius * 1.8 + 32.0; |
| Serial.print(" Temperature = "); |
| Serial.print(celsius); |
| Serial.print(" Celsius, "); |
| Serial.print(fahrenheit); |
| Serial.println(" Fahrenheit"); |
| } |