Interfacing Multiple DS18B20 Temperature Sensors to Arduino:
In this project, we will learn about Interfacing Multiple DS18B20 Temperature Sensors to Arduino. Simply we will connect Multiple DS18B20 Temperature Sensors to Arduino and display the temperature values of all the sensors in degree Celsius or Fahrenheit. Only one digital pin of Arduino is required to connect several temperature sensors. We can connect a maximum of 1024 sensors using I2C Protocol. But here I have shown connecting 3 DS18B20 Temperature Sensors to Arduino.
The DS18B20 temperature sensor is a 1-wire digital temperature sensor. This comes with a sealed package lets precisely measure temperatures in wet environments with a simple 1-Wire interface. It communicates on a common bus. It means it can connect several devices and read their values using just one digital pin of the Arduino.
DS18B20 Waterproof Digital Temperature Sensor:
This is a pre-wired and waterproofed version of the DS18B20 sensor. Handy for when you need to measure something far away, or in wet conditions. The Sensor can measure the temperature between -55 to 125°C (-67°F to +257°F). The cable is jacketed in PVC.
Because it is digital, there is no any signal degradation even over long distances. These 1-wire digital temperature sensors are fairly precise, i.e ±0.5°C over much of the range. It can give up to 12 bits of precision from the onboard digital-to-analog converter. They work great with any microcontroller using a single digital pin.
The only downside is they use the Dallas 1-Wire protocol, which is somewhat complex and requires a bunch of code to parse out the communication. We toss in a 4.7k resistor, which is required as a pullup from the DATA to the VCC line when using the sensor.
Components Required:
- Arduino UNO Board
- Multiple DS18B20 Waterproof Temperature Sensor
- 16*2 LCD Display
- 4.7K Resistor
- Breadboard
- Connecting Jumper Wires
Multiple DS18b20 Temperature sensors Interfacing with Arduino, Circuit Diagram:
Multiple DS18b20 Arduino Source Code/Program:
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//https://www.electroniclinic.com/ // Download Libraries // https://www.electroniclinic.com/arduino-libraries-download-and-projects-they-are-used-in-project-codes/ #include <LiquidCrystal.h> LiquidCrystal lcd(11, 12, 5, 4, 3, 2); #include <OneWire.h> #include <DallasTemperature.h> #define ONE_WIRE_BUS 9 // Data wire is plugged into port 9 on the Arduino #define precision 12 // OneWire precision Dallas Sensor int sen_number = 0; // Counter of Dallas sensors OneWire oneWire(ONE_WIRE_BUS); DallasTemperature sensors(&oneWire); // Pass our oneWire reference to Dallas Temperature. DeviceAddress T1, T2, T3, T4, T5, T6, T7, T8; // arrays to hold device addresses void setup(void) { lcd.begin(16,2); Serial.begin(9600); //Start serial port Serial.println("Dallas Temperature IC Control Library"); // Start up the library sensors.begin(); // locate devices on the bus Serial.print("Found: "); Serial.print(sensors.getDeviceCount(), DEC); Serial.println(" Devices."); // report parasite power requirements Serial.print("Parasite power is: "); if (sensors.isParasitePowerMode()) Serial.println("ON"); else Serial.println("OFF"); // Search for devices on the bus and assign based on an index. if (!sensors.getAddress(T1, 0)) Serial.println("Not Found Sensor 1"); if (!sensors.getAddress(T2, 1)) Serial.println("Not Found Sensor 2"); if (!sensors.getAddress(T3, 2)) Serial.println("Not Found Sensor 3"); if (!sensors.getAddress(T4, 3)) Serial.println("Not Found Sensor 4"); if (!sensors.getAddress(T5, 4)) Serial.println("Not Found Sensor 5"); if (!sensors.getAddress(T6, 5)) Serial.println("Not Found Sensor 6"); if (!sensors.getAddress(T7, 6)) Serial.println("Not Found Sensor 7"); if (!sensors.getAddress(T8, 7)) Serial.println("Not Found Sensor 8"); // show the addresses we found on the bus for (int k =0; k < sensors.getDeviceCount(); k++) { Serial.print("Sensor "); Serial.print(k+1); Serial.print(" Address: "); if (k == 0) { printAddress(T1); Serial.println(); } else if (k == 1) { printAddress(T2); Serial.println(); } else if (k == 2) { printAddress(T3); Serial.println(); } else if (k == 3) { printAddress(T4); Serial.println(); } else if (k == 4) { printAddress(T5); Serial.println(); } else if (k == 5) { printAddress(T6); Serial.println(); } else if (k == 6) { printAddress(T7); Serial.println(); } else if (k == 7) { printAddress(T8); Serial.println(); } } // set the resolution to 12 bit per device sensors.setResolution(T1, precision); sensors.setResolution(T2, precision); sensors.setResolution(T3, precision); sensors.setResolution(T4, precision); sensors.setResolution(T5, precision); sensors.setResolution(T6, precision); sensors.setResolution(T7, precision); sensors.setResolution(T8, precision); for (int k =0; k < sensors.getDeviceCount(); k++) { Serial.print("Sensor "); Serial.print(k+1); Serial.print(" Resolution: "); if (k == 0) { Serial.print(sensors.getResolution(T1), DEC); Serial.println(); } else if (k == 1) { Serial.print(sensors.getResolution(T2), DEC); Serial.println(); } else if (k == 2) { Serial.print(sensors.getResolution(T3), DEC); Serial.println(); } else if (k == 3) { Serial.print(sensors.getResolution(T4), DEC); Serial.println(); } else if (k == 4) { Serial.print(sensors.getResolution(T5), DEC); Serial.println(); } else if (k == 5) { Serial.print(sensors.getResolution(T6), DEC); Serial.println(); } else if (k == 6) { Serial.print(sensors.getResolution(T7), DEC); Serial.println(); } else if (k == 7) { Serial.print(sensors.getResolution(T8), DEC); Serial.println(); } } } // function to print a device address void printAddress(DeviceAddress deviceAddress) { for (uint8_t i = 0; i < 8; i++) { // zero pad the address if necessary if (deviceAddress[i] < 16) Serial.print("0"); Serial.print(deviceAddress[i], HEX); } } // function to print the temperature for a device void printTemperature(DeviceAddress deviceAddress) { float tempC = sensors.getTempC(deviceAddress); Serial.print("Temp : "); Serial.print(tempC); Serial.print(" Celcius degres "); // Serial.print(" Temp F: "); // Serial.print(DallasTemperature::toFahrenheit(tempC)); } // function to print a device's resolution void printResolution(DeviceAddress deviceAddress) { } void printData(DeviceAddress deviceAddress) { Serial.print("Device Address: "); printAddress(deviceAddress); Serial.print(" "); printTemperature(deviceAddress); Serial.println(); } void loop(void) { // call sensors.requestTemperatures() to issue a global temperature request to all devices on the bus Serial.print("Reading DATA..."); sensors.requestTemperatures(); Serial.println("DONE"); // print the device information for (int k =0; k < sensors.getDeviceCount(); k++) { Serial.print("Sensor "); Serial.print(k+1); Serial.print(" "); if (k == 0) { printData(T1); } else if (k == 1) { printData(T2); } else if (k == 2) { printData(T3); } else if (k == 3) { printData(T4); } else if (k == 4) { printData(T5); } else if (k == 5) { printData(T6); } else if (k == 6) { printData(T7); } else if (k == 7) { printData(T8); } } if (sen_number == sensors.getDeviceCount()) { sen_number = 0; // reset counter // lcd.clear(); // clear screen on LCD } lcd.setCursor(0,0); lcd.print("Sensor Number "); lcd.print(sen_number+1); lcd.setCursor(0,1); lcd.print(" Temp: "); if (sen_number == 0) { lcd.print(sensors.getTempC(T1)); lcd.write((char)223); lcd.print("C "); } else if (sen_number == 1) { lcd.print(sensors.getTempC(T2)); lcd.write((char)223); lcd.print("C "); } else if (sen_number == 2) { lcd.print(sensors.getTempC(T3)); lcd.write((char)223); lcd.print("C "); } else if (sen_number == 3) { lcd.print(sensors.getTempC(T4)); lcd.write((char)223); lcd.print("C "); } else if (sen_number == 4) { lcd.print(sensors.getTempC(T5)); lcd.write((char)223); lcd.print("C "); } else if (sen_number == 5) { lcd.print(sensors.getTempC(T6)); lcd.write((char)223); lcd.print("C "); } else if (sen_number == 6) { lcd.print(sensors.getTempC(T7)); lcd.write((char)223); lcd.print("C "); } else if (sen_number == 7) { lcd.print(sensors.getTempC(T8)); lcd.write((char)223); lcd.print("C "); } Serial.print("Sensor Number="); Serial.println(sen_number); delay(2000); sen_number++ ; } |
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