Alarms and security

Electronic auto stethoscope Turn signal alarm Motorcycle turn-signal system Cigarette lighter 9V adaptor Analog Tachometer for Gasoline Engines Headlight On reminder with Light Adaptive Windscreen Wiper Control Car clock Car message display Car interval wiper Safety indicator ligh Speed limit alert Grand Cherokee Off-Highway Lights Engine control unit schematics Portable CD Player Adapter For Car Car battery charger Wireless Auto Tachometer Alternator Signal Detector Automotive alarm system Road ice alarm Automotive Anti-Lock Brake Control Driver Headlight reminder Breath Alcohol Tester controlling a car ignition system Simple car battery charger Flashing / pulsing third brake like for cars Headlight flasher Speed alert - wireless portable unit Parking aid senses distance to rear of vehicle Automatic headlight brightness switch Car battery charger circuit Electronic car ignition circuit Car battery voltage tester using LM3914 Synchronized multi-spark module (SMSM) for Electronic Ignition Devices (EID) Economy radar detector Headlight timer Parking sonar Fuel injector pulse width monitor BMW R Series Motorcycle Regulator Schematic 80188XL Engine Tachometer Integrate Fuel Pump Wire Security Cut Off with a Turbo Time Simple Car Preamplifier and Artificial Earth FCD (Fuel Cut Defencer) Interface between GM’s 5 Volt 8192 baud ALDL data stream and a PC serial port 5301 wideband fuel mixture display Wide Band Fuel Mixture Display 3rd brake light 12V to 9V car coverter Car Nicad charger Combination lock for car liftgate BMW motorcycle side stand protection mod

Air flow detector Air flow detector Strain gauge sensor Digital Water Wave/Tide/Level Meter (PIC16F876) Self made data-logger V2.5 (second edition) Magnetometer Analog input section based on AD9220 uModem 4+4/8 channel A/D board ADXL202 accelerometer to CV output Light direction sensor 12-Bit ADC interface Digital thermometer Universal flight controllers / datalogger Rain detector Home Brew Compass Sensor Using 555 Timer as an A/D converter ADC0804LCN 8-bit A/D converter Web-based thermometer project Low Flow-Rate Thermal Flowmeter Geiger counter Differential Capacitance Measurement for Tilt Meter Honey Bee counter (PDF) Capacitance type liquid level measurement (PDF) Thermostat node schematic Digital PC Oscilloscope Ultrasonic Range &