The Adafruit 5971 - DS18B20 Extender Breakout is a specialized breakout board designed to enhance the functionality of the DS18B20 digital temperature sensor. This board allows multiple DS18B20 sensors to be connected in a daisy-chain configuration, simplifying wiring and enabling scalable temperature sensing solutions. It is ideal for projects requiring multiple temperature readings over a single data line, such as environmental monitoring, industrial automation, and smart home systems.
The following table outlines the key technical details of the Adafruit 5971 - DS18B20 Extender Breakout:
Parameter | Specification |
---|---|
Operating Voltage | 3.3V to 5V |
Communication Protocol | 1-Wire |
Supported Sensors | DS18B20 digital temperature sensors |
Maximum Sensors | Limited by 1-Wire bus constraints |
Operating Temperature | -55°C to +125°C (sensor-dependent) |
Dimensions | 25mm x 20mm |
The breakout board features a simple pinout for easy integration. Below is the pin configuration:
Pin Name | Description |
---|---|
VIN | Power input (3.3V to 5V) |
GND | Ground connection |
DATA_IN | 1-Wire data input from the microcontroller or host |
DATA_OUT | 1-Wire data output to the next breakout in the chain |
Below is an example of how to use the Adafruit 5971 - DS18B20 Extender Breakout with an Arduino UNO:
#include <OneWire.h>
#include <DallasTemperature.h>
// Define the 1-Wire bus pin
#define ONE_WIRE_BUS 2
// Create a OneWire instance to communicate with the DS18B20 sensors
OneWire oneWire(ONE_WIRE_BUS);
// Pass the OneWire reference to DallasTemperature library
DallasTemperature sensors(&oneWire);
void setup() {
Serial.begin(9600);
Serial.println("DS18B20 Extender Breakout Example");
// Start the DallasTemperature library
sensors.begin();
}
void loop() {
Serial.println("Requesting temperatures...");
// Request temperature readings from all sensors on the bus
sensors.requestTemperatures();
// Print the temperature of each sensor
for (int i = 0; i < sensors.getDeviceCount(); i++) {
float tempC = sensors.getTempCByIndex(i);
Serial.print("Sensor ");
Serial.print(i);
Serial.print(": ");
Serial.print(tempC);
Serial.println(" °C");
}
// Wait 2 seconds before the next reading
delay(2000);
}
No Temperature Readings:
Inconsistent Readings:
Unable to Detect All Sensors:
Q: Can I use this breakout board with other 1-Wire sensors?
A: This breakout board is specifically designed for DS18B20 sensors. Compatibility with other 1-Wire sensors is not guaranteed.
Q: How many sensors can I chain together?
A: The number of sensors is limited by the 1-Wire bus constraints, which depend on factors such as cable length, power supply, and pull-up resistor value. Typically, up to 10 sensors can be chained reliably.
Q: Do I need a separate pull-up resistor for each breakout board?
A: No, a single 4.7kΩ pull-up resistor on the data line is sufficient for the entire chain.
Q: Can I use this breakout board with a 3.3V microcontroller?
A: Yes, the breakout board supports both 3.3V and 5V logic levels, making it compatible with a wide range of microcontrollers.