DS18B20 temperature sensor

By Admin, 15/09/2026 · 4 min read

DS18B20 temperature sensor guide for the 37-in-1 Arduino Sensors Kit.

37-in-1 kit, module 01

KY-001: DS18B20 temperature sensor

Reads temperature as a number, to a tenth of a degree, over one wire. Plug it in, upload the sketch, then change the thing it senses and watch the reading.

All 37 modules Nano and shield wiring Joy-IT page for this module

KY-001, DS18B20 temperature sensor

Reads temperature as a number, to a tenth of a degree, over one wire.

How it works

DS18B20 temperature sensor

What is going on

The black part is a DS18B20, a digital thermometer chip. It measures temperature itself and sends the result as data on a single wire, so the Nano asks for a reading and gets a number back rather than a voltage to interpret. Several DS18B20s can share the same wire; each has its own serial number.

Connections

Wiring to the Arduino Nano on its expansion shield

The pins below match the sketch further down this page; change one and change the other.

Power off first

Unplug the USB cable before you plug in, move or remove any module.

A lead plugged in live can touch the wrong pin for a moment, and 5 V on a signal pin is how a module dies. Unplug, wire, check the letters, then plug the cable back in.

Module pinGoes to

Module SignalS row of the column marked 4, digital bank

Module +VV row, 5 V

Module GNDG row, ground

Where it plugs in on the shield

The ringed column is the one this module uses. G on top for ground, V in the middle for 5 V, S at the bottom for the signal. A module with more than one signal wire uses one column per wire.

Read the letters on the shield

Both banks on this shield read G, V, S from the top. The letters are printed at the ends of the rows.

The module's minus or GND pin goes to G, its plus or VCC pin to V, and each signal to the S row of the numbered column.

A module in backwards puts 5 V on the signal pin. Some survive it, plenty do not.

Starter sketch

Code you can copy and upload

Every sketch on these pages is compiled for the Arduino Nano before it is published. The pin numbers at the top match the connection table above.

ky001.inoArduino C++

1#include <OneWire.h>
2#include <DallasTemperature.h>
3
4const uint8_t ONE_WIRE = 4;        // module S -> D4
5OneWire wire(ONE_WIRE);
6DallasTemperature sensors(&wire);
7
8void setup() {
9  Serial.begin(9600);
10  sensors.begin();
11}
12
13void loop() {
14  sensors.requestTemperatures();
15  Serial.print("temperature C: ");
16  Serial.println(sensors.getTempCByIndex(0), 1);
17  delay(1000);
18}

Install two libraries from the Library Manager: OneWire and DallasTemperature, both by Miles Burton and others.

Try first

Hold the black sensor between two fingers and watch the number climb.

The quickest way to see it respond.

1

Unplug the USB cable. Plug the module into the column shown above, minus to G, plus to V, signal to S.

2

Plug the USB cable back in. Copy the sketch, upload it, and open Tools > Serial Monitor at 9600 baud.

3

Do the thing the module senses and watch the reading, the L LED, or the sound respond.

Reference

More on this module

The Joy-IT page has the datasheet figures and examples for other boards; the repository has the original vendor files.

Joy-IT SensorKit: KY-001
KY-numbered kit repository: datasheets and original examples
Arduino Nano and I/O expansion shield wiring
Arduino Nano and DHT11 electronics workshop
All 37 modules

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DS18B20 temperature sensor

KY-001: DS18B20 temperature sensor

KY-001, DS18B20 temperature sensor

DS18B20 temperature sensor

What is going on

Wiring to the Arduino Nano on its expansion shield

Where it plugs in on the shield

Read the letters on the shield

Code you can copy and upload

Hold the black sensor between two fingers and watch the number climb.

More on this module

Help improve MakerAccess

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