Light meter
Photoresistor on A5, plotted live. Cover it, shine a torch on it, hold a sheet of paper over it.
Sensor modules
Photoresistor
What you need
37-in-1 Arduino Sensors Kit
ItemBack to item dashboard
37-in-1 Arduino Sensors Kit
By Fix It Today, 05/07/2026 · 9 min read
37-in-1 Arduino Sensors Kit item guide for MakerAccess vending machine projects.
Sensor lab
37-in-1 Arduino Sensors Kit
The KY-series kit: 37 modules on their own little boards, each with three or four pins that plug straight into the Nano expansion shield. Start with one module, see its value change, then build from there. The photos below are the actual modules; the boards in the box may not carry the Joy-IT print but are the same parts. alert, game, or moving project.
Start here
Four steps before any module
1
Install the Arduino IDE and upload Blink to the bare Nano. That proves the board, cable and settings.
2
Seat the Nano on the expansion shield, USB-C at the DC-jack end, all thirty pins home.
3
Start with the KY-004 push button (a digital input), then the KY-018 photoresistor (an analog input), then the KY-015 DHT11 (a sensor that sends data).
4
One module at a time. Get its reading on the Serial Monitor before you add a second one.
Power off first
Unplug the USB cable every time you change a 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.
Before wiring
Match the letters printed on the module to the letters on the shield: minus or GND to G, plus or VCC to V, S or OUT to the S row of the numbered column.
Most modules have three pins and take one column. The joystick, rotary encoder and RGB LEDs have more signal wires and use one column per wire; their pages show which.
Use the Serial Monitor first. Add a display or a motor only after the reading makes sense.
The flame sensor, laser, relay and the two mercury tilt switches have a care note on their pages. Read it before the module comes out of the box.
Pick a direction
What do you want to detect or control?
Choose the kind of signal first, then open a module card for details.
Temperature and climate4 modules to explore
Motion and position5 modules to explore
Magnetic5 modules to explore
Inputs5 modules to explore
Light and infrared8 modules to explore
Sound4 modules to explore
LEDs5 modules to explore
Outputs and power1 modules to explore
Starter wiring
One lead per module
Every module in this kit is a 3-pin header: ground, voltage, signal. On the Nano expansion shield that is one lead into the numbered header the sketch uses. Each module page lists its own pins.
The rule for all 37
Both banks on this shield read G, V, S from the top: G is ground, V is 5 V, S is the numbered Nano signal. The letters are printed at the row ends.
Digital pins are HIGH or LOW. Analog inputs A0 to A7 read a voltage as a number from 0 to 1023. A digital sensor such as the DHT11 or DS18B20 sends a message with the measurement in it.
Run modules from the 5 V row. The 3V3 header comes off the USB bridge chip and sags under load.
A module in backwards puts 5 V on the signal pin. Unplug it the moment one gets warm.
Project grid
Builds that make the kit feel useful
Each card starts from the listed kit modules and project components. Optional request parts are labelled only when they come from wider FIT inventory.
Beam-break counter
The laser across a gap onto the photoresistor. Every time something breaks the beam, count one.
Sensor modules
Laser modulePhotoresistor
What you need
37-in-1 Arduino Sensors Kit
Humidity alarm
DHT11 on D4, active buzzer on D5. Beep when a breath pushes humidity over a threshold, with a dead band so it does not chatter.
Sensor modules
DHT11 temperature and humidityActive buzzer
What you need
37-in-1 Arduino Sensors Kit
Magnetic door demo
Reed switch on the frame, magnet on the door. The RGB LED shows green closed, red open.
Sensor modules
Reed switchRGB LED, 5 mm
What you need
37-in-1 Arduino Sensors Kit
Pulse plotter
Fingertip on the heartbeat sensor, Serial Plotter open. Count the dips over fifteen seconds and multiply by four.
Sensor modules
Heartbeat sensor
What you need
37-in-1 Arduino Sensors Kit
Knock lock
Knock sensor counts taps; three in two seconds lights the two-colour LED green, anything else red.
Sensor modules
Knock sensorTwo-colour LED, 5 mm
What you need
37-in-1 Arduino Sensors Kit
IR remote colour picker
Any TV remote at the IR receiver. Each button sets a different colour on the RGB LED.
Sensor modules
Infrared receiverRGB LED, 5 mm
What you need
37-in-1 Arduino Sensors Kit
Joystick tone
X axis sets the pitch on the passive buzzer, Y sets how long each note lasts. A one-stick instrument.
Sensor modules
JoystickPassive buzzer
What you need
37-in-1 Arduino Sensors Kit
All 37 modules
Open a module guide
One page per module: what it does, how it works, exactly where it plugs in on the shield, and a sketch that compiles for the Nano.
Temperature and climate
Module 01
DS18B20 temperature sensorReads temperature as a number, to a tenth of a degree, over one wire.Open module guide
Module 12
Analog temperature sensor, NTCA thermistor: resistance falls as it warms, read as a voltage.Open module guide
Module 13DHT11 temperature and humidityTemperature and relative humidity as whole numbers, once a second.Open module guide
Module 26
Thermistor, digital and analogAn NTC thermistor with a threshold output you set with the potentiometer.Open module guide
Motion and position
Module 02
Vibration switchCloses a contact when the module is shaken or knocked.Open module guide
Module 15
Mercury tilt switchA switch that closes when the module is tipped past level.Open module guide
Module 18
Tilt switch, ballA switch that closes when tipped, using a steel ball.Open module guide
Module 25
Magic light cupA tilt switch and an LED on one board; two boards pour light between them.Open module guide
Module 28Knock sensorA spring switch that closes for an instant when knocked.Open module guide
Magnetic
Module 03
Hall magnetic sensorSignal goes low when a magnet is close.Open module guide
Module 19Reed switchA glass switch that closes when a magnet is near.Open module guide
Module 22
Linear Hall sensorMagnet strength as a number, plus a threshold output.Open module guide
Module 23
Reed sensor, analog and digitalA reed switch with an adjustable threshold output.Open module guide
Module 32
Analog Hall sensorField strength as a number, no threshold circuit.Open module guide
Inputs
Module 04
Push buttonA momentary switch: low while pressed, high when released.Open module guide
Module 21JoystickTwo analog axes and a push button in one stick.Open module guide
Module 33
Metal touch sensorReacts when a finger touches the bare metal leg.Open module guide
Module 36Heartbeat sensorShows your pulse as a wave when a fingertip covers the sensor.Open module guide
Module 37
Rotary encoderA knob that reports each click and which way you turned it.Open module guide
Light and infrared
Module 05
Infrared transmitterAn infrared LED you can flash, invisible to the eye but visible to a phone camera.Open module guide
Module 07Laser moduleA red laser diode you switch on and off from a pin.Open module guide
Module 09
Photo interrupterSignal changes when something blocks the slot.Open module guide
Module 16PhotoresistorResistance falls as light gets brighter, read as a number 0 to 1023.Open module guide
Module 20Infrared receiverDecodes the codes a TV remote sends.Open module guide
Module 24
Flame sensorDetects the infrared a flame gives off, from about a metre.Open module guide
Module 29
Obstacle avoidance sensorSignal goes low when something is within a few centimetres in front.Open module guide
Module 30
Line tracking sensorTells a dark line from a light surface a centimetre below it.Open module guide
Sound
Module 06
Passive buzzerPlays a note at whatever frequency the sketch sends it.Open module guide
Module 11
Active buzzerBeeps at a fixed pitch whenever the pin is high.Open module guide
Module 34
Microphone, high sensitivitySound level as a number, with a threshold output.Open module guide
Module 35
MicrophoneSound level as a number, less sensitive than KY-037.Open module guide
LEDs
Module 08
RGB LED, surface-mountOne LED package with red, green and blue elements you mix with PWM.Open module guide
Module 10
Two-colour LED, 5 mmRed and green in one 5 mm LED, each on its own pin.Open module guide
Module 14
RGB LED, 5 mmA 5 mm LED with red, green and blue elements on three pins.Open module guide
Module 27
Two-colour LED, 3 mmRed and green in a small 3 mm LED, one pin each.Open module guide
Module 31
Seven-colour flashing LEDAn LED that cycles through colours on its own when powered.Open module guide
Outputs and power
Step-by-step guides
Worked builds that use this kit
The workshop guides take one module all the way from an empty laptop to working code, and the wiring reference covers the board and the expansion shield.
Arduino Nano and DHT11 electronics workshop
Arduino Nano and I/O expansion shield wiring
Inside the DHT11: protocol, frame and accuracy
Install Arduino IDE on Windows or Mac
Arduino Nano and I/O expansion shield wiring
Inside the DHT11: protocol, frame and accuracy
Install Arduino IDE on Windows or Mac
Source links
Module evidence and simulators
Use these references to check the kit list, see wiring diagrams, or test code before using hardware.
Joy-IT SensorKit documentation: every KY module, with pin tables and examples
KY-numbered 37-in-1 kit: datasheets and original examples
TkkrLab wiki: Arduino 37 sensors
Arduino Software
Wokwi Arduino simulator
KY-numbered 37-in-1 kit: datasheets and original examples
TkkrLab wiki: Arduino 37 sensors
Arduino Software
Wokwi Arduino simulator
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