Ultrasonic Level Sensor
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LED Thermometer
This LED thermometer is designed for in home use, to read temperatures between about 60 and 78 degrees Fahrenheit. It is based around a precision temperature se...
Fuzzy Urn
Accurate control of water temperature, this got me thinking and I figured it was a good opportunity to have a play. To control the temperature I decided to try ...
Snow Depth Measurement Sensor
Developing a sensor to measure the snow. If the sensor could be made inexpensively, then the power of the Internet could be used to collect a large number of sa...
Hall effect
A series resistor, and a bypass capacitor along with a zener in parallel with the hall sensor to clamp transients that still get through. I use hall sensors her...
Acceleration Monitor using ADXL202 and AVR
The schematic show that the AccelR8 only uses 3 IC`s. An AVR 8515 microcontroller do the calculation work and controls the other circuits. An MAX603 controls vo...
Medical and Health related Schematics
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Proximity detector for humans
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Encoder Circuits
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Fluid level control schematic diagrams
The LM1830 fluid level detector circuit is a device intended to signal the presence or absence of aqueous solutions, featuring low external parts count, wide su...
Capacitive Sensor Circuit
The purpose of this circuit is to animate shop-windows by means of a capacitive sensor placed behind a post-card-like banner. The card is placed against the gla...
Simple One-Wire Touch Detector circuit
This simple circuit can be used to activate whatever you like, for example, by connecting it to microcontroller, relays, secret alarms, robot applications or ju...
Temperature-Controlled Switch circuit
It sounds rather mysterious: a switch that is controlled by its ambient temperature. All without the touch of a human hand, except for when you re building this...
Temperature Monitor circuit
Using a thermistor in the position shown makes a heat activated sensor. A change in temperature will alter the output of the opamp and energize the relay and li...
On-Off Temperature Control circuit
This circuit controls a load (in this case a dc brushless fan) based on a temperature compared with a setpoint. THe transduced is a diode in the forward polariz...
Thunderstorm Predictor circuit
Sure, listening to VHF FM has great advantages over MW/LW AM from the old days now we have bright stereo free from interference, fading and noise! However, you...
Water Pump Relay Controller Circuit
By means of a Relay, employed to drive a water pump, this circuit provides automatic level control of a water reservoir or well. The shorter steel rod is the "w...
Water Level Indicator Circuit
When the water-level is below the steel rods, no contact is occurring from the metal can and the rods, which are supported by a small insulated (wooden) board. ...
Temperature-Controlled Soldering Iron circuit
One reason why commercial soldering stations are expensive is that, in general, they require the use of soldering irons with inbuilt temperature sensors, such a...
NAVAL SONAR
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