Explore Circuits - Sensors circuit




Circuit / Schematic diagram of	Description

Zero Crossing Detector new	Based on dual Op-Amp and can detect positive and negative zero cross
RADAR Sensor new	X band RADAR detector, detects change in rf radiation.
Temperature sensor/indicator (circuit on demand)	Thermistor based and suitable for automotive application.
Touch Sensor (circuit on demand)	Based on 555 timer with transistorized relay driving circuit
Hall-Effect Proximity Sensor (circuit on demand)	Based on hall effect sensor, can also be used as metal detector for security systems.
AC-Magnetic Field (circuit on demand)	Detects any kind of magnetic interference caused by AC magnetic field. Uses inductor for detection of magnetic field.
Toxic Gas Sensor (circuit on demand)	Circuit for detecting toxic gas like propane or gasoline.
Ultrasonic proximity sensor (circuit on demand)	Ultrasonic based proximity sensor, suitable for robotics
Proximity Sensor (circuit on demand)	Proximity sensor based on infrared ray with amplifier stage for photodiode for better sensitivity.
Hygrometer (Circuit on demand)	Suitable for measuring humidity
Air flow detector 1	Circuit uses an incandescent lamp to detect airflow
Air flow detector 2
Dew Sensor	Simple resistor type due sensor element as sensor.
Digital Compass	Based on hall effect sensor.
Digital Compass 2	Compass based on AVR series microcontroller AT90s2313
Home brew compass	Based on the dinsmore 1655 analog compass part.
Mains operated capacitive sensor
Ultrasonic range finder	Circuit consist ultrasonic Tran receiver for measuring range
Flame Sensor
Pellistors	Pellistors employ catalytic combustion to measure combustible gases or vapors
Pressure Gauge Responds Linearly to Altitude
Vibration Sensor
Infrared Body heat Detector	Uses piezoelectric detector to detect IR emission
Light Sensor	Detects light or no light condition, 741 used as comparator.
Dew sensor
Hot water level indicator	Indicates the temperature range inside a tank.
Remote humidity sensor
Liquid level detector and filler	Suitable for toilet flush
Fluid Level Detector
Water level detector and controller
DTMF Proximity Detector	DTMF based IR transmitter and receiver is used as proximity detector
Magnetic proximity sensors	Circuit consist of reed switch at its heart.
Proximity sensor with alarm
Living creature proximity detector	Proximity sensor working on eddy current detection
Rain Detector
Rain Detector 2
Color sensor	Color sensor using optical filter and LDR. Can sense three color.
Light activated relay	Simple transistor based circuit. Which triggers relay when no light is received by the sensor.
Programmable Light activated relay	The triggering intensity can be adjusted.
Light activated relay	Simple transistor based circuit.
Light activated relay
Light sensor with hysteresis	Comparator with positive feedback for obtaining hysteresis
Dark-activated 230V Lamp
Dark activated switch
IR Detector
Darkness monitor
Lightning Detector	VLF receiver tuned to 300 kHz to detect the crackle of approaching lightning.
Lightning Detector 2
Wireless weather station
Magnetic Proximity Switch
Energy Leakage Detector	Circuit very slight temperature changes in respect to the ambient temperature.
Electric Field & Leakage Detector	Detects very small currents like caused by leakage and changing electric fields.
Electromagnetic field detector	Small easy to construct build around low noise OpAmp.
Geomagnetic field detector	Used to detect the earth's magnetic field.
Magnetic Gun	Based on 555 timer and 4017 counter and used for propelling magnetic slug.
Magnetic-Radiation Remote-Control	Remote control controlled by magnetic field.
Magnetic proximity sensors	Based on 555 timer
Commercial Metal detector
Home made Metal Detector	Simple circuit uses very few components.

Metal Detector 1
Metal Detector 2
Metal Detector 3	Based on CS209A
Metal detector 4
BFO Metal Detector
Pressure Sensor-Based Altimeter Circuit	The circuit uses an absolute pressure sensor to measure barometric pressure.
Temperature Sensor for Embedded Applications
Heat Sensor	Thermistor based temperature sensor unit.
Microcontroller based TempRat	Controls device to stay in a specific temperature range, the circuit also contains digital display.
Sesmic Detector	Simple using piezoelectric element as sensor
Temperature sensor	Circuit consist of a voltage comparator whose output controls the relay.
Microcontroller based temperature sensor	The circuit senses temperature and sends to PC.
Temperature sensor with digital output	Uses LM35DT as temperature sensor.
Vibration sensor
Water Sensor
Adjustable water level sensor with alarm	Circuit uses probes as sensor.
Touch operated Lamp	Three way touch lamp.
RADAR Sensor	Uses OpAmp as current to voltage converter to detect RADAR
Ultrasonic RADAR	Simple and applicable circuit for motion detection using RADAR
Ultrasonic Detector	Based on Phase Locked Loop (PLL)
Low voltage battery disconnected circuit
Voltage overrange detector.	OpAmp based circuit for detecting voltage over and under range within a window.

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