Circuit Documentation

Summary

This circuit consists of an Arduino UNO microcontroller interfaced with a DS18B20 temperature sensor. The DS18B20 sensor is connected to the Arduino UNO via a digital input pin with a pull-up resistor. The purpose of this circuit is to measure temperature data and output the readings to the serial console. The Arduino UNO is programmed to read the temperature data from the DS18B20 sensor and print the temperature in Celsius to the serial console.

Component List

Arduino UNO

• Description: A microcontroller board based on the ATmega328P.
• Purpose: Acts as the central processing unit for the circuit, reading temperature data from the DS18B20 sensor and sending it to the serial console.
• Pins:
  • UNUSED
  • IOREF
  • Reset
  • 3.3V
  • 5V
  • GND
  • Vin
  • A0 to A5
  • SCL
  • SDA
  • AREF
  • D13 to D0

DS18B20

• Description: A 1-Wire digital temperature sensor.
• Purpose: Measures temperature and provides data to the Arduino UNO.
• Pins:
  • VDD
  • DQ
  • GND

Resistor

• Description: A passive two-terminal electrical component that implements electrical resistance as a circuit element.
• Purpose: Acts as a pull-up resistor for the DS18B20 data line.
• Properties:
  • Resistance: 200 Ohms

Wiring Details

Arduino UNO

• 5V connected to DS18B20 VDD
• GND connected to DS18B20 GND
• D3 connected to one end of the Resistor
• D2 connected to DS18B20 DQ and the other end of the Resistor

DS18B20

• VDD connected to Arduino UNO 5V
• DQ connected to Arduino UNO D2 and Resistor
• GND connected to Arduino UNO GND

Resistor

• One end connected to Arduino UNO D3
• The other end connected to DS18B20 DQ and Arduino UNO D2

Documented Code

The embedded code for the Arduino UNO is written in C++ and is used to interface with the DS18B20 temperature sensor. The code utilizes the OneWire and DallasTemperature libraries to communicate with the sensor and read temperature data. The temperature is then printed to the serial console in Celsius.

The code is divided into several files:

• sketch.ino: The main Arduino sketch that sets up the sensor and serial communication, then enters a loop where it reads and prints the temperature.
• DallasTemperature.h and DallasTemperature.cpp: These files define the DallasTemperature class, which provides functions for interacting with the DS18B20 sensor.
• OneWire.h and OneWire.cpp: These files define the OneWire class, which handles the low-level 1-Wire communication protocol used by the sensor.
• OneWire_direct_gpio.h and OneWire_direct_regtype.h: These header files contain platform-specific definitions for direct GPIO access, used by the OneWire library for optimized communication.

The code is structured to first configure the Arduino digital pins for communication with the sensor, then enter a loop where the temperature is read and printed to the serial console every second. The DallasTemperature library is used to abstract the details of the sensor communication, making the main sketch simpler and more readable.