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To test an Arduino Uno with a temperature sensor like the DS18B20, you’ll need to wire it correctly, upload the right code, and verify readings via the Serial Monitor.
Hardware Setup
Components: Arduino Uno, DS18B20 sensor (waterproof or TO-92), 4.7 kΩ pull-up resistor (if no adapter), jumper wires, breadboard.
Connections (with bare DS18B20): VDD → 5V on Arduino GND → GND on Arduino DQ → Digital pin (e.g., D2) + 4.7 kΩ resistor between DQ and VDD
If using an adapter module, connect directly without an external resistor.
Arduino Code Example
Install required libraries in Arduino IDE:
OneWire by Jim Studt
DallasTemperature by Miles Burton
#include <OneWire.h>#include <DallasTemperature.h>#define SENSOR_PIN 2 // Pin connected to DS18B20 DQOneWire oneWire(SENSOR_PIN);DallasTemperature sensors(&oneWire);void setup() {Serial.begin(9600);sensors.begin();}void loop() {sensors.requestTemperatures();float tempC = sensors.getTempCByIndex(0);float tempF = tempC * 9 / 5 + 32;Serial.print("Temperature: ");Serial.print(tempC);Serial.print("°C ~ ");Serial.print(tempF);Serial.println("°F");delay(1000);}Copied!✕Copy Arduino - Temperature Sensor | Arduino Tutorial
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