How to force the diode to blink

How to force the diode to blink

The light-emitting diode differs from a bulb in that frequent inclusions and switching off do not reduce its service life. It allows to use it together with current breakers, without being afraid to put out of action.

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It is simplest to force to blink a light-emitting diode with the built-in breaker. For this purpose give on it tension in direct polarity. Some of such diodes contain the built-in resistors that allows to give on them tension which is not exceeding four volts without external resistor. But remember that in them also there are protective diodes which are switched on in the return polarity. If it is wrong to connect such light-emitting diode to a source, and thus not to use the resistor, the protective diode will be warmed and will melt a light-emitting crystal. That it did not happen, when checking polarity of such light-emitting diode use the resistor without fail. Also arrive at the supply voltage exceeding four volts and also in case it is not known, whether there is in the blinking light-emitting diode a protective resistor.

Periodically switching on and off a crystal, the breaker in the blinking light-emitting diode as appropriate modulates also the consumed device current. It allows to use it for interruption of current through two-three more usual light-emitting diodes. Include them, observing polarity, it is consecutive with the blinking. In same include a chain consistently and increase the resistor, and supply voltage that it was enough for opening of all light-emitting diodes. Usual light-emitting diodes will synchronously blink with the blinking.

In some cases it is necessary that light-emitting diodes blinked not synchronously, and in a disparate. In this case all of them have to be the blinking. Include them in parallel, observing polarity. If they demand resistors, include those consistently with each of them.

To force a light-emitting diode it is possible to blink also in other ways. The most widespread of them consists in use of the RC generators differently called by multivibrators. They share on symmetric, asymmetrical and executed on logical elements. Try to construct, in particular, such generator according to the scheme shown on an illustration. In this case two light-emitting diodes will alternately blink.

If you build a design which part the hardware-software Arduino platform or similar, additional elements is to force it to blink, do not use. Connect it via the resistor or the anode to plus of food and the cathode to a controler exit, or the cathode to the general wire and the anode to a controler exit. In the first case it will shine at logical zero, in the second - at logical unit. Having written the program so that logical level on corresponding an exit periodically changed, you will force a light-emitting diode to blink.