DS18B20 communication is using 1 wire port. With the 1wire port the memory and control functions will not be available before the ROM function protocol has been established. The master must first provide on of five ROM function command.
1. READ ROM
2. MATCH ROOM
3. SEARCH ROM
4. SKIP ROM
5. ALARM SEARCH
These commands operate on the 64bit lasered ROM portion each device and the single out a specific device if many are preset on the 1-wire line as well as indicate to the BUS master how many and what types of devices are present. After a ROM function sequence has been successfully executed, the memory and control function are accessible and the master may then provide any one of the six memory and control function commands. for more details visit this link.
HC06 Bluetooth module, This modules uses BlueCore is a single chip radio and baseband IC for Bluetooth 2.4GHz system including enhance data rates (EDR) to 3Mbps. for more details on AT command click this link.
Required Components
- Arduino Microcontroller
- HC06 Bluetooth Module
- DS18B20 Temperature Sensor
- Solder Less Bread Board
- Jumper Wires / DuPont Wires
- Android App. (Temperature Monitor)
Wiring Diagram
Android App.
https://play.google.com/store/apps/details?id=com.a14core.bluetoothtemp
Sketch Code
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#include <OneWire.h> int SensorPin = 2; OneWire ds(SensorPin); void setup(void) { Serial.begin(9600); } void loop(void) { float temperature = getTemp(); Serial.println(temperature); delay(200); } float getTemp(){ byte data[12]; byte addr[8]; if ( !ds.search(addr)) { ds.reset_search(); return -1000; } if ( OneWire::crc8( addr, 7) != addr[7]) { return -1000; } if ( addr[0] != 0x10 && addr[0] != 0x28) { return -1000; } ds.reset(); ds.select(addr); ds.write(0x44,1); byte present = ds.reset(); ds.select(addr); ds.write(0xBE); for (int i = 0; i < 9; i++) { data[i] = ds.read(); } ds.reset_search(); byte MSB = data[1]; byte LSB = data[0]; float tempRead = ((MSB << 8) | LSB); float TemperatureSum = tempRead / 16; return TemperatureSum; } |
Downloads
Download OneWire Code Library Here | Zip
Download DS18B20 Datasheet Diagram | PDF
Hello, nice project.
Can you share the android code of the app?
Best Regards
Art