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| Measurement |
The reed switch is an electrical switch operated by an applied magnetic field. It consists of a pair of contacts on ferrous metal reeds in a hermetically sealed glass envelope. They are often used in alarm systems, on bicycles for wheel speed measurement and in many other devices. Here we will say few words about reed switch and show you very interesting video how they are made
Color sensor theory for dummies
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| Measurement |
Light.Visible light is an electromagnetic wave in range of 400 to 700nm. This is just a small part of all existing wavelengths. The light that we see is not one wavelength but a combination of many wavelengths.
The spectral power distribution - SPD shows the precise dependence of the color in function of light source in the form of diagram that represents energy at each wavelength in the visible spectrum.
Electronic gas sensors and detectors – clasification and operating principles
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| Gas Sensors |
A gas detector is a device which detects the presence of various gases within an area, usually as part of a safety system. This type of equipment is used to detect a gas leak and interface with a control system so a process can be automatically shut down. A gas detector can also sound an alarm to operators in the area where the leak is occurring, giving them the opportunity to leave the area. This type of device is important because there are many gases that can be harmful to organic life, such as humans or animals.
Infrared system with encoder and decoder for remote control and directing the mobile robot
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| IR |
In this example we will explain how to make your own IR system for remote control and you will see how that system can be applied for directing mobile robot (or similar processes).
System consists of transmitter and receiver. IR LEDs emit light on frequency that is detectable with commercial IR receiver. How system works? On picture you can see how is NE555 times used to modulate IR light at 36 kHz.