DS18B20 Digital Temperature Sensor Module 1-Wire 3.3V/5V with LED Indicator | Arduino Compatible

DS18B20 Digital Temperature Sensor Module — 1-Wire, 3.3V/5V, Arduino Compatible

The DS18B20 digital temperature sensor module is one of the most popular temperature sensing solutions in the maker and embedded systems community. Built around the Dallas/Maxim DS18B20 IC, this compact 20×15mm PCB module communicates via the 1-Wire protocol — requiring only a single digital pin on your microcontroller to deliver accurate digital temperature readings from -55°C to +85°C. An onboard LED flashes during 1-Wire communication, providing instant visual confirmation that your sensor is active and talking to your MCU.

Specifications

Sensor IC	DS18B20 (Dallas/Maxim)
Communication	1-Wire serial interface
Supply Voltage	3.0V – 5.5V (3.3V and 5V compatible)
Temperature Range	-55°C to +85°C
Accuracy	±0.5°C (-10°C to +85°C)
Resolution	9–12 bit (programmable)
Logic High	>2.2V
Logic Low	<0.8V
PCB Dimensions	20 × 15mm
Connector	3-pin header (G/−, VCC, S/Data)
Indicator	LED flashes during 1-Wire communication
Package	SS Encapsulated TO-92 on PCB

Pin Connections

Pin Label	Function	Connect To
− / G	Ground	Arduino GND
Center / R	VCC (3.3–5V)	Arduino 3.3V or 5V
S / Y	1-Wire Data Bus	Any Arduino digital pin

Arduino Quick-Start

1. Connect G to Arduino GND, R to 5V, S to digital pin 4.
2. Add a 4.7kΩ pull-up resistor between the S pin and VCC (required for 1-Wire bus).
3. Install OneWire and DallasTemperature libraries via Arduino IDE Library Manager.
4. Upload the example sketch and open Serial Monitor at 9600 baud to read temperature.

Tip: If the sensor reads -127°C, the 4.7kΩ pull-up resistor is missing or not connected correctly.

Why Choose the DS18B20?

• ✅ Single-wire interface — only one MCU digital pin required, freeing up I/O for other sensors
• ✅ Multiple sensors on one bus — daisy-chain multiple DS18B20s on a single wire using unique 64-bit serial addresses
• ✅ Digital output — immune to electrical noise, ideal for long cable runs unlike analog sensors
• ✅ Programmable resolution — 9 to 12-bit resolution for speed vs. accuracy trade-off
• ✅ 3.3V and 5V compatible — works with Arduino, ESP32, ESP8266, Raspberry Pi, and STM32
• ✅ LED communication indicator — instant visual feedback during sensor polling
• ✅ Inspected and verified — basic operation tested before shipping

Common Applications

• Arduino temperature monitoring and data logging
• Thermostat and temperature controller projects
• 3D printer heated bed and hotend temperature sensing
• Aquarium and fish tank temperature monitoring
• Weather station and environmental sensing
• Cooling fan control based on temperature threshold
• Home automation temperature nodes (ESP8266/ESP32 + MQTT)

Package Contents

• 1× DS18B20 Digital Temperature Sensor Module (20×15mm PCB)

Enjoy free standard shipping on all orders over $199 USD. Orders are processed within 1–2 business days.

Not satisfied? Return any item within 90 days of purchase for a full refund or exchange. Items must be in original condition.

We are committed to quality, reliability, and customer satisfaction. Every product is carefully selected and tested to meet the highest standards.