Under $100

A5 Printed Sensors Set of 3

Conductive Paint Sensor

Use paper as a sensor. See tutorial here for use...

Electro-Fashion, Push Button Switch

Sewable electronics

This sewable push switch from Kitronik can be...

Grove - Button

Sensor/Input/Output

This new version of button twig contains one...

Grove - Button (p)

Sensor/Input/Output

What does “P” mean? “P” is for “panel...

Grove - Humidity and Temperature Sensor

Sensor

Grove - Temperature & Humidity Sensor is a...

Grove - Slide Potentiometer

Sensor/Input/Output

This slide potentiometer is a linear variable resistor...

Grove - Sound Sensor

Sensor/Input/Output

The Sound sensor module is a simple microphone....

Grove - Temperature Sensor

Sensor/Input/Output

Grove - Temperature Sensor uses a thermistor to...

Grove - Water Sensor

Sensor/Input/Output

Grove - Water Sensor detects the presence of water...

Kitronik 'Mini' Prong Soil Moisture Sensor for BBC micro:bit

Sensor

The Mini Prong soil sensor is a short...

Kitronik Clippable Detector Board V1.0

Sensor/Input/Output

Detects light, objects and can follow lines.  The...

Magnetic Buttons/Fasteners, Pack of 5

Sewable electronics

Pack of 5 Magnetic Buttons/Fasteners. Ideal for using...

Serial MP3 player Module (and mini speaker)

MP3 player for micro:bit

The module is asimple MP3 player device which...

SparkFun Soil Moisture Sensor (with Screw Terminals)

Sensor

The SparkFun Soil Moisture Sensor is a simple...

Ultrasonic Sensor - HC-SR04, 5V

Sensor/Input/Output

This is the HC-SR04 ultrasonic ranging sensor. This...

Ultrasonic sensor with casing and cables, 3.3v

Sensor/Input/Output