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How to Use DS18B20: Examples, Pinouts, and Specs
Design with DS18B20 in Cirkit DesignerIntroduction
The DS18B20 is a precision digital temperature sensor that offers a convenient one-wire interface, allowing for easy integration with microcontrollers such as the Arduino UNO. It is widely used in various applications, including environmental temperature monitoring, HVAC systems, and consumer electronics. The sensor's unique ability to operate over a wide temperature range and its small footprint make it ideal for embedded systems.
Explore Projects Built with DS18B20
Arduino UNO Based Temperature Monitoring System with DS18B20 Sensor
This circuit is designed to measure temperature using a DS18B20 sensor interfaced with an Arduino UNO. The Arduino reads temperature data from the sensor via a 1-Wire bus with a pull-up resistor and outputs the readings to the serial console.
Open Project in Cirkit DesignerArduino UNO-Based Multi-Sensor Environmental Monitoring System
This circuit involves an Arduino UNO microcontroller interfacing with a DS18B20 temperature sensor. The sensor is powered by the Arduino's 5V and GND pins, and its data pin is connected to a digital I/O pin on the Arduino, with a pull-up resistor in place. The setup is designed to read temperature data from the sensor.
Open Project in Cirkit DesignerESP8266 NodeMCU with DS18B20 Temperature Sensor Monitoring
This circuit features an ESP8266 NodeMCU microcontroller connected to a DS18B20 temperature sensor. The sensor's data line (DQ) is connected to the D2 pin of the NodeMCU through a 4.7k ohm pull-up resistor, which is a common configuration for one-wire temperature sensors. The sensor is powered by the 3.3V supply from the NodeMCU, and both the sensor and the NodeMCU share a common ground.
Open Project in Cirkit DesignerArduino UNO with Multiple DS18B20 Sensors for Temperature Monitoring
This circuit is designed to monitor temperatures using multiple DS18B20 1-Wire temperature sensors connected to an Arduino UNO microcontroller. The sensors are powered by the Arduino's 5V output and share a common data line (DQ) connected to digital pin 2 through a 4.7kΩ pull-up resistor, allowing for simultaneous temperature readings. The Arduino runs a sketch that reads temperatures from each sensor and outputs the readings to the serial monitor in both Celsius and Fahrenheit.
Open Project in Cirkit DesignerExplore Projects Built with DS18B20
Arduino UNO Based Temperature Monitoring System with DS18B20 Sensor
This circuit is designed to measure temperature using a DS18B20 sensor interfaced with an Arduino UNO. The Arduino reads temperature data from the sensor via a 1-Wire bus with a pull-up resistor and outputs the readings to the serial console.
Open Project in Cirkit DesignerArduino UNO-Based Multi-Sensor Environmental Monitoring System
This circuit involves an Arduino UNO microcontroller interfacing with a DS18B20 temperature sensor. The sensor is powered by the Arduino's 5V and GND pins, and its data pin is connected to a digital I/O pin on the Arduino, with a pull-up resistor in place. The setup is designed to read temperature data from the sensor.
Open Project in Cirkit DesignerESP8266 NodeMCU with DS18B20 Temperature Sensor Monitoring
This circuit features an ESP8266 NodeMCU microcontroller connected to a DS18B20 temperature sensor. The sensor's data line (DQ) is connected to the D2 pin of the NodeMCU through a 4.7k ohm pull-up resistor, which is a common configuration for one-wire temperature sensors. The sensor is powered by the 3.3V supply from the NodeMCU, and both the sensor and the NodeMCU share a common ground.
Open Project in Cirkit DesignerArduino UNO with Multiple DS18B20 Sensors for Temperature Monitoring
This circuit is designed to monitor temperatures using multiple DS18B20 1-Wire temperature sensors connected to an Arduino UNO microcontroller. The sensors are powered by the Arduino's 5V output and share a common data line (DQ) connected to digital pin 2 through a 4.7kΩ pull-up resistor, allowing for simultaneous temperature readings. The Arduino runs a sketch that reads temperatures from each sensor and outputs the readings to the serial monitor in both Celsius and Fahrenheit.
Open Project in Cirkit DesignerTechnical Specifications
Key Features
- Temperature Range: -55°C to +125°C (-67°F to +257°F)
- Accuracy: ±0.5°C accuracy from -10°C to +85°C
- Resolution: Selectable from 9 to 12 bits
- Supply Voltage: 3.0V to 5.5V
- Current: 1mA active, 1µA standby
Pin Configuration
| Pin Number | Name | Description |
|---|---|---|
| 1 | GND | Ground |
| 2 | DQ | Data |
| 3 | VDD | Power Supply (3.0V to 5.5V) |
Usage Instructions
Connecting the DS18B20 to a Circuit
- Connect the GND pin to the ground of the power supply.
- Connect the VDD pin to a 3.0V to 5.5V power supply.
- Connect the DQ pin to a digital input/output pin on your microcontroller.
- Place a 4.7kΩ pull-up resistor between the DQ pin and the VDD pin.
Best Practices
- Use a pull-up resistor on the DQ line to ensure proper communication.
- Avoid long wire runs to minimize resistance and potential communication errors.
- Use a decoupling capacitor close to the sensor's VDD pin to stabilize the power supply.
Example Code for Arduino UNO
#include <OneWire.h>
#include <DallasTemperature.h>
// Data wire is connected to Arduino digital pin 2
#define ONE_WIRE_BUS 2
// Setup a oneWire instance to communicate with DS18B20 sensors
OneWire oneWire(ONE_WIRE_BUS);
// Pass oneWire reference to DallasTemperature library
DallasTemperature sensors(&oneWire);
void setup() {
Serial.begin(9600);
sensors.begin(); // Start up the library
}
void loop() {
sensors.requestTemperatures(); // Send command to get temperatures
float temperature = sensors.getTempCByIndex(0); // Read temperature in Celsius
Serial.print("Temperature: ");
Serial.print(temperature);
Serial.println("°C");
delay(1000); // Wait 1 second before next reading
}
Troubleshooting and FAQs
Common Issues
- No Temperature Reading: Ensure the pull-up resistor is correctly placed and the sensor is properly powered.
- Inaccurate Readings: Check for proper grounding and stable power supply. Ensure the correct resolution is set.
FAQs
Q: Can I connect multiple DS18B20 sensors to the same data line? A: Yes, the DS18B20 supports multiple devices on the same one-wire bus.
Q: How do I set the resolution of the DS18B20?
A: The resolution can be set using the DallasTemperature library functions setResolution().
Q: What is the maximum cable length for the DS18B20? A: It depends on the quality of the cable and the environment, but runs over 100 meters are possible with proper cabling and pull-up resistors.
For further assistance, consult the datasheet or contact technical support.