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Ultrasonic Distant Obstacle Detector – Circuit Schematic
Ultrasonic Distant Obstacle Detector
The first sensor a robot usually gets fitted with is an obstacle detector. It may take three different forms, depending on the type of obstacle you want t.....
Transcutaneous Electrical Nerve Stimulator (TENS) – Circuit Schematic
Transcutaneous Electrical Nerve Stimulator (TENS)
A Transcutaneous Electrical Nerve Stimulation (TENS) device is, put bluntly, a machine for giving electric shocks. The author was prescribed such a device.....
Temperature-Controlled Soldering Iron – Circuit Schematic
Temperature-Controlled Soldering Iron
One reason why commercial soldering stations are expensive is that, in general, they require the use of soldering irons with inbuilt temperature sensors,.....
Super Light Sensor – Circuit Schematic
Super Light Sensor
This Super Light Sensor  responds to minute fluctuations in light level, auto-adjusting over the range from about 200 lux up to 60, 000 lux (ie, from a modest...
Salt TasterCircuit – Circuit Schematic
Salt TasterCircuit
Detects the amount of salt contained in liquid foods, Three-level LED indicator This circuit was designed to detect the approximate percentage of salt con.....
Quick On-Board Junction TesterCircuit – Circuit Schematic
Quick On-Board Junction TesterCircuit
Acoustic check of transistor and diode junctions, Also suitable as continuity tester Short circuits or broken pcb tracks can be easily recognized by means.....
Pulse Rate Monitor – Circuit Schematic
Pulse Rate Monitor
This simple circuit enables you to listen to your heartbeat, for instance, while you are exercising. The transducer used for detecting the pulse is an ele.....
Plant Watering Watcher Circuit Schematic – Circuit Schematic
Plant Watering Watcher Circuit Schematic
A flashing LED signals the necessity to water a plant, 3V powered circuit This circuit is intended to signal when a plant needs water. A LED flashes at a.....
Mains Voltage Detector – Circuit Schematic
Mains Voltage Detector
The detector is intended to sense and signal to another circuit that an appliance is connected to the mains voltage. For this purpose, an optocoupler, IC1.....
Line Following Robot Sensor – Circuit Schematic
Line Following Robot Sensor
This Line Following Robot sensor or surface scanner for robots is a very simple, stamp-sized, short range (5-10mm) Infrared proximity detector wired aroun.....
Invisible Broken Wire Detector – Circuit Schematic
Invisible Broken Wire Detector
Portable loads such as video cameras, halogen flood lights, electrical irons, hand drillers, grinders, and cutters are powered by connecting long 2- or 3-.....
Infra-Red Level Detector – Circuit Schematic
Infra-Red Level Detector
Useful for liquids level detection and proximity devices, Up to 50 cm. range, optional relay operation This circuit is useful in liquids level or proximit.....
Heart Rate Monitor – Circuit Schematic
Heart Rate Monitor
Strictly speaking, this simple circuit shouldn t work! How could anyone expect an ordinary light dependent resistor photo cell to ‘see through a fingerti....
Energy Leak Detector – Circuit Schematic
Energy Leak Detector
This sensitive circuit is basically a comparator, detecting very slight temperature changes in respect to the ambient temperature. It was primarily intended to ...
DIY Infrared Radar System – Circuit Schematic
DIY Infrared Radar System
Chris has a great article about a do-it-yourself radar system build with PIC18F452. It s a great hobby project although the schematic.....
Digital Remote Thermometer – Circuit Schematic
Digital Remote Thermometer
Remote sensor sends data via mains supply, Temperature range: 00.0 to 99.9 °C This circuit is intended for precision centigrade temperature measurement, w.....
Celsius Thermometer – Circuit Schematic
Celsius Thermometer
The circuit of the Celsius thermometer in the diagram is based on the well-known Type LM334 from National Semiconductor. This IC is a sensor that provides.....
Capacitive SensorCircuit – Circuit Schematic
Capacitive SensorCircuit
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...
Beam-break Detector For Camera Shutter or Flash Control – Circuit Schematic
Beam-break Detector For Camera Shutter or Flash Control
This circuit is presented as an alternative to the IR beam break detector featured in the June 2009 issue (Silicon Chip). In order to make it relatively i.....
Automatic Heat Detector – Circuit Schematic
Automatic Heat Detector
This circuit uses a complementary pair comprising npn metallic transistor T1 (BC109) and pnp germanium transistor T2 (AC188) to detect heat (due to outbre.....