DS18B20 Arduino Temperature Sensor - How to Tutorial

Summary

This video details the setup and functionality of a DS18B20 waterproof temperature sensor with an Arduino Uno. It covers wiring configurations, required libraries, and programming logic to display temperature readings on an OLED screen. The presenter explains how to achieve varying resolution settings, conduct temperature tests with ice and boiling water, and discusses the accuracy of the readings compared to a thermocouple. The project illustrates the ease of using 1-Wire devices for temperature monitoring, making it accessible for both beginners and experienced hobbyists.

Takeaways

• 🔍 The DS18B20 is a waterproof temperature sensor capable of measuring from -55°C to +125°C.
• 🔌 The sensor operates on a power supply of 3 to 5.5 volts with three wires: VCC, ground, and data.
• 📏 The sensor features unique 64-bit serial codes for each unit, allowing multiple sensors on the same 1-wire bus.
• ⚙️ Users can configure the sensor's resolution to 9, 10, 11, or 12 bits, affecting measurement precision.
• 💡 For optimal precision, setting the resolution to 11 bits provides a change detection of 0.1°C.
• 📊 The Arduino Uno powers the sensor and displays temperature data on both an OLED and a serial monitor.
• 📚 Required libraries include OneWire, DallasTemperature, and SSD1306 for OLED display.
• 🔄 The program continuously reads and displays temperature values, converting Celsius to Fahrenheit as needed.
• 🌡️ The sensor’s response time may vary, with thermocouples reacting more quickly than the DS18B20.
• ✅ The setup can successfully track temperature changes in both cold and hot environments, confirming accuracy.

Q & A

What is the DS18B20 sensor used for?

The DS18B20 is a waterproof temperature sensor used for measuring temperature within a range of -55°C to +125°C.

What are the three wires of the DS18B20 sensor?

The three wires are VCC (power), ground, and data line.

How is the DS18B20 powered?

It can be powered by an external 3-5.5V supply or through the data line using parasitic power.

What does the unique 64-bit serial code of the DS18B20 allow?

It allows multiple sensors to be connected on the same 1-wire bus and be individually identified.

What resolution can the DS18B20 sensor be set to?

The sensor can be configured for resolutions of 9, 10, 11, or 12 bits, affecting the precision of temperature readings.

Which libraries are needed to interface with the DS18B20 sensor?

The OneWire library and the Dallas Temperature library are required to communicate with the DS18B20.

How is temperature displayed using the DS18B20?

Temperature is displayed in both degrees Celsius and Fahrenheit on an OLED display and in the serial monitor.

What does the pull-up resistor do in the DS18B20 setup?

The pull-up resistor is necessary for the data line to maintain proper communication between the sensor and the microcontroller.

What are the differences in response time between the DS18B20 and a thermocouple?

The thermocouple typically responds faster to temperature changes compared to the DS18B20, which may be affected by its enclosure.

What factors can affect the accuracy of the DS18B20 readings?

Environmental factors such as heat retention in the enclosure and the setup's configuration can affect accuracy.