A 3-wire connection is needed. You provide power to the VDD pin. Here’s the schematic you need to follow:
Parasite mode:
You only need data and GND. The sensor derives its power from the data line. In this case,here’s the schematic you need to follow:
To interface with the DS18B20 temperature sensor, you need to install the One Wire library by Paul Stoffregen and the Dallas Temperature library. Follow the next steps to install those libraries.
Open your Arduino IDE and go to Sketch > Include Library > Manage Libraries. The Library Manager should open.
Type “OneWire” in the search box and install the OneWire library by Paul Stoffregen.
Programming:
#include <OneWire.h> #include <DallasTemperature.h>/ // Data wire is conntec to the Arduino digital pin 4 #define ONE_WIRE_BUS 4 // Setup a oneWire instance to communicate with any OneWire devices OneWire oneWire(ONE_WIRE_BUS); // Pass our oneWire reference to Dallas Temperature sensor DallasTemperature sensors(&oneWire); void setup(void) { // Start serial communication for debugging purposes Serial.begin(9600); sensors.begin(); } void loop(void) { // Call sensors.requestTemperatures() to issue a global temperature and Requests to all devices on the bus sensors.requestTemperatures(); Serial.print(“Celsius temperature: “); // Why “byIndex”? You can have more than one IC on the same bus. 0 refers to the first IC on the wire Serial.print(sensors.getTempCByIndex(0)); Serial.print(” – Fahrenheit temperature: “); Serial.println(sensors.getTempFByIndex(0)); delay(1000); }
After uploading the code, open the Arduino IDE Serial Monitor at a 9600 baud rate. You should get the temperature displayed in both Celsius and Fahrenheit:
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