Encyclopedia of Electronic Components Volume 3: Sensors for by Charles Platt

By Charles Platt

Want to grasp the best way to use an digital part? This 3rd booklet of a three-volume set comprises key info on electronics elements on your projects--complete with images, schematics, and diagrams. you are going to research what every one does, the way it works, why it really is worthwhile, and what editions exist. regardless of how a lot you recognize approximately electronics, you will find interesting information you've got by no means encounter before.

Perfect for lecturers, hobbyists, engineers, and scholars of every age, this reference places trustworthy, fact-checked details correct at your fingertips--whether you are fresh your reminiscence or exploring an element for the 1st time. novices will fast take hold of very important suggestions, and more matured clients will locate the categorical info their tasks require.

Volume three covers elements for sensing the actual international, together with gentle, sound, warmth, movement, ambient, and electric sensors.

  • Unique: the 1st and basically encyclopedia set on digital parts, distilled into 3 separate volumes
  • Incredibly detailed: comprises details distilled from hundreds of thousands of sources
  • Easy to browse: components are basically equipped via part type
  • Authoritative: fact-checked by way of professional advisors to make sure that the knowledge is either present and accurate
  • Reliable: a extra constant resource of knowledge than on-line assets, product datasheets, and manufacturer's tutorials
  • Instructive: every one part description presents information about substitutions, universal difficulties, and workarounds
  • Comprehensive: quantity 1 covers strength, electromagnetism, and discrete semi-conductors; quantity 2 contains built-in circuits, and light-weight and sound resources; quantity three covers various sensing devices.

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Additional resources for Encyclopedia of Electronic Components Volume 3: Sensors for Location, Presence, Proximity, Orientation, Oscillation, Force, Load, Human Input, Liquid ... Light, Heat, Sound, and Electricity

Example text

Low cost. Disadvantages of a Hall Effect Sensor • Requires a separate magnet (which must be placed carefully to avoid affecting other components). • Open-collector output typically limited to 20mA or less. • May be vulnerable to magnetic fields. • When sensing an object that comes between the switch and a magnet, only a ferrous object can be used. What Can Go Wrong Optical Sensor Issues Deterioration of LEDs Most object presence sensors depend on infrared LEDs as a light source. An LED has many virtues (discussed in Volume 2), but does tend to suffer from gradual reduction in light output over a period of years.

An omnipolar sensor can be thought of as a pair of unipolar sensors mounted in opposite directions and Chapter 3: object presence sensor 19 Values spatial > presence > object presence with their (open-collector) outputs wired together. This component functions similarly to a reed switch, although of course it still requires a power supply. measured in tesla or gauss, and the abbreviation BRP is used. 5VDC. Check datasheets carefully. Also known as an analog Hall sensor, its output voltage varies in proportion to an external magnetic field instead of switching cleanly between high and low states.

See Figure 3-17. While most of the following suggestions relate specifically to Hall-effect sensors, some general principles may be applied to optical sensors. Linear Motion A presence sensor can be activated when the triggering source (such as light or a magnet) approaches it directly. This is sometimes referred to as head-on mode. Alternatively, triggering can be arranged when the source moves past the sensor. This is sometimes referred to as slide-by mode. The two modes are illustrated in sections 1 and 2 of Figure 3-16.

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