1-wire barometer
Accelerometer Schematic

ADXL202 accelerometer to CV output

Air flow detector

Capacitance type liquid level measurement (PDF)

Darkness monitor

Digital Water Wave/Tide/Level Meter (PIC16F876)

Electroscope (Electrostatic sensor)

Fluid level detector

Geiger counter

Glitch detector

Home Brew Compass Sensor

Honey Bee counter (PDF)

Ion detector

LCD Thermometer

Light detector

741 Light Sensor

Magnetometer (pdf)

Metal detector

Simple BFO metal detector

MiniLOGGER V1.0

Simple metal detector electronic circuit

Pressure Sensor-Based Altimeter Circuit
Rain detector

Serial Port A/D-converter

Static Electricity / Negative Ion Detector

Strain gauge sensor

Temperature datalogger

Thermometer project

Ultrasonic Range & Imager

Ultrasonic range finder circuit

Water-level sensor

Wireless Liquid Level Sensing for Restaurant Applications

Wireless weather station

Sensor Components

@ e-Gizmo

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Gas Sensor

Carbon Monoxide Sensor

Ultrasonic sensor

Photo Transistor and LDR

Hall effect sensor, pressure sensor,

and lots more!..