Motion Sensor by DanZen

Motion Triggered Spy Cam by Kipkay

Touche for Arduino: Advanced touch sensing. by madshobye

DIY Force Sensitive Resistor (FSR) by kylemcdonald

Stairway LED lighting with IR trip sensor by ElJefeUno

Temperature sensor / weatherstation by chr

Five-cent Tilt Sensor by ix

How to Make a Ridiculously Cheap Analog Pressure Sensor by hiskeyd

DIY Touch Sensor by giladlotan

Re-purposing an Air Wick Freshmatic Compact i-Motion by Doug Paradis

Chuck TV Intersect Cube DIY working model by e024576

Tilt Activated Switch by frank26080115

Using an RGB LED to Detect Colours by fjordcarver

Laser cut enclosure with living hinge lid by fasaxc

How to make simple "motion" sensors by teebee918

Tilt Switches Made from Bottles of Craft Beads by fjordcarver

Tweet-A-Temp by Z0t

Accelerometer & Gyro Tutorial by Gadget Gangster

Tachometer made from a bicycle speedometer (cyclocomputer) by josie

Planting Subway Grates: Step by Step Instruction by GreatestGrates

$30 Historical Temperature Sensor System using PC,1-wire,… by xorshift

Horizontal gyroscope stabilization camera system by Robot_Red_Beard

Make an acoustic rain gauge (disdrometer) by nusnel

Create own Membrane Matrix Keypad (and hooking it up to t… by TheBestJohn

Tilt Sensor Tutorial by adafruit

Turn a pencil drawing into a capacitive sensor for Arduino by alan.chatham

The Aqua-Replenisher! by RPisces

Trashcan Listening Device by ehudwill

Presure Switch Alarm by robotix