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12-Bit ADC interface
1-wire barometer
4-channel data telemetry system
Accelerometer Schematic
ADC0804LCN 8-bit A/D converter
Addressable ADC
ADXL202 accelerometer to CV output
Air flow detector
Analog input section based on AD9220
Capacitance type liquid level measurement (PDF)
Centronics port D/A converters and low-pass filter
Differential Capacitance Measurement for Tilt Meter
Digital compass schematic
Digital PC Oscilloscope
Digital thermometer
Digital Water Wave/Tide/Level Meter (PIC16F876)
Electronic altimeter using PIC16F877
Geiger counter
Home Brew Compass Sensor
Honey Bee counter (PDF)
LCD Thermometer
Light direction sensor
Low Flow-Rate Thermal Flow meter
Magnetometer
Precision Digital Altimeter
Pressure Sensor-Based Altimeter Circuit
Rain detector
Remote digital thermometer sends data over AC power line
Self made data-logger V2.5 (second edition)
Serial Port A/D-converter
Strain gauge sensor
Temperature data logger
Thermostat node schematic
Ultrasonic Range & Imager
Ultrasonic range finder circuit
uModem 4+4/8 channel A/D board
Universal flight controllers / datalogger
Using 555 Timer as an A/D converter
Voltage follower with 1G ohm input resistance
Water-level sensor
Web-based thermometer project
Wireless Liquid Level Sensing for Restaurant Applications
Wireless weather station
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