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Digital temperature sensor with 1-Wire interface.

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Pin names

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VCC
Power
Positive voltage
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DQ
Digital I/O
1-Wire data line (input/output)
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GND
Ground
Ground

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Attributes

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temperature
string
default:"22"
Initial temperature value (celsius)
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deviceID
string
default:"010203040506"
12-character hex device ID for the 1-Wire address
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familyCode
string
default:"28"
1-Wire family code

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Controlling the temperature

You can change the temperature value while the simulation is running. Click on the DS18B20 sensor and a small popup window will open. Use the temperature slider to change the value. The temperature range is -55°C to 125°C.

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Multiple sensors

You can connect multiple DS18B20 sensors to the same data pin. Each sensor must have a unique deviceID attribute. The 1-Wire protocol allows addressing individual sensors by their unique ID. Example with three sensors: 
{
  "parts": [
    { "type": "wokwi-ds18b20", "id": "temp1", "attrs": { "deviceID": "111111111111" } },
    { "type": "wokwi-ds18b20", "id": "temp2", "attrs": { "deviceID": "222222222222" } },
    { "type": "wokwi-ds18b20", "id": "temp3", "attrs": { "deviceID": "333333333333" } }
  ]
}

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Arduino code example

#include <OneWire.h>
#include <DallasTemperature.h>

#define ONE_WIRE_BUS 2

OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

void setup() {
  Serial.begin(115200);
  sensors.begin();
}

void loop() {
  sensors.requestTemperatures();
  float tempC = sensors.getTempCByIndex(0);
  Serial.print("Temperature: ");
  Serial.print(tempC);
  Serial.println(" °C");
  delay(1000);
}
The DallasTemperature library cannot read temperatures of exactly -55°C due to a limitation in how the library detects disconnected sensors. If you need to read this specific temperature, use the OneWire library directly.

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Automation controls

The temperature sensor can be controlled using Automation Scenarios. It exposes the following controls:
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temperature
float
Set the temperature value in Celsius (between -55 and 125)

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Simulator examples

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