The DS18B20 is a precision digital temperature sensor that offers a convenient way to measure temperature in a wide range of applications. Manufactured by ELEGOO, this sensor is known for its ease of use with microcontrollers such as the Arduino UNO. It uses the 1-Wire protocol, which minimizes the number of pins required for operation, allowing multiple DS18B20 sensors to be connected in parallel on the same data line.
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 Designer
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 Designer
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 Designer
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 Designer| Pin Number | Name | Description |
|---|---|---|
| 1 | GND | Ground pin, connected to the system ground |
| 2 | DQ | Data pin, used for 1-Wire communication |
| 3 | VDD | Power supply pin, 3.0V to 5.5V |
#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 any OneWire device
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 temperatureC = sensors.getTempCByIndex(0);
Serial.print("Temperature is: ");
Serial.print(temperatureC);
Serial.println("°C");
delay(1000); // Wait 1 second before next reading
}
sensors.getAddress() function to verify the unique address of each sensor.Q: Can the DS18B20 be powered parasitically? A: Yes, the DS18B20 can be powered parasitically by connecting the VDD pin to the DQ line through a pull-up resistor.
Q: How many DS18B20 sensors can be connected on the same data line? A: There is no strict limit, but practical considerations like power supply stability and data line capacitance typically allow for around 10-20 sensors.
Q: How do I read the temperature from multiple sensors? A: Each sensor has a unique address. Use the DallasTemperature library functions to read each sensor by its address.
Q: What is the purpose of the unique 64-bit serial code? A: The unique code allows multiple DS18B20 sensors to be used on the same 1-Wire bus without address conflicts, enabling individual sensor identification and communication.