Circuit Documentation

Summary

This circuit is designed to read temperature data from a DS18B20 temperature sensor using an Arduino UNO microcontroller. The DS18B20 sensor communicates with the Arduino via a digital pin, and a resistor is used as a pull-up for the data line. The temperature readings are printed to the serial console.

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Component List

Arduino UNO

• Description: A microcontroller board based on the ATmega328P.
• Purpose: Acts as the main controller for reading data from the DS18B20 sensor and processing it.

DS18B20

• Description: A digital temperature sensor.
• Purpose: Measures temperature and communicates the data to the Arduino.

Resistor

• Description: A passive electrical component that resists the flow of current.
• Purpose: Used as a pull-up resistor for the data line of the DS18B20 sensor.

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Wiring Details

Arduino UNO

• 5V: Connected to the VDD pin of the DS18B20.

• GND: Connected to the GND pin of the DS18B20.

• D2: Connected to the DQ pin of the DS18B20.

• D3: Connected to pin1 of the Resistor (used as a pull-up).

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DS18B20

• VDD: Connected to the 5V pin of the Arduino UNO.

• GND: Connected to the GND pin of the Arduino UNO.

• DQ: Connected to D2 pin of the Arduino UNO through the Resistor.

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Resistor

• pin1: Connected to D3 pin of the Arduino UNO.

• pin2: Connected to DQ pin of the DS18B20.

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Documented Code

/*
 * This Arduino sketch reads temperature data from a DS18B20 sensor
 * connected to pin D2 and prints the temperature to the serial console.
 * Pin D3 is set to HIGH to act as a pull-up resistor for the DS18B20 data line.
 */

#include "OneWire.h"
#include "DallasTemperature.h"

#define ONE_WIRE_BUS 2
#define PULLUP_PIN 3

OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

void setup() {
  // Set D3 as output and set it HIGH for pull-up
  pinMode(3, OUTPUT);
  digitalWrite(3, HIGH);

  // Start serial communication
  Serial.begin(9600);
  // Start up the library
  sensors.begin();
  
}

void loop() {
  // Request temperature readings
  sensors.requestTemperatures();
  // Fetch and print the temperature in Celsius
  Serial.println("here getting tempC by index");
  float temperatureC = sensors.getTempCByIndex(0);
  Serial.print("Temperature: ");
  Serial.print(temperatureC);
  Serial.println(" °C");
  // Wait 1 second before repeating
  delay(1000);
}

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This documentation provides a comprehensive overview of the circuit, detailing the components used, their connections, and the code that drives the functionality of the system.