2011年12月18日星期日

DIY: LED Random Flasher

While creating a random LED flasher from discrete parts can be done, several low-cost integrated circuits are for sale to result in the project simpler. The 555 timer, readily available for under 25 cents last year, is really a handy foundation. Many LED-flasher schematics can be found online for this. Should you write software, a prrr-rrrglable integrated circuit (PIC) can get the job done. Flashing designs are based on your program. You may also create pseudo-random designs having a simple circuit in line with the 4026 Counter/Display Driver IC.||LED Bar Lights

    555 Timer

        The 555 timer, or its cousin, the 556 dual timer, have lengthy been cornerstones from the hobbyist's work bench. To create a random flasher for a variety of LEDs, you'd need one 555 per LED, a treadmill 556 for each LED pair. Additionally for this, you will need a group of three capacitors and three resistors to create the timing for every LED. With respect to the timing you choose, you are able to set the resistors and also the capacitors to 1 value, simplifying your buying. To produce a group of at random flashing LEDs, simply build some identical 555 driver circuits, each using its own "on" switch. Whenever you turn them on, they'll blink off and on from sync. Turning them off, after that time again, can create a brand new pattern.||LED DownLight
    PIC

        Photos are capable of doing sophisticated tasks, because of the right software. You will need the PIC itself, the PIC programming hardware and a number of outboard parts, including LEDs. The programmer connects for your computer, in which you develop the programs. Within this situation, it is the programming, not the hardware, that determines the expensive pattern and speed. For those who have other projects that may also employ a smart controller, trading inside a PIC setup is sensible. In case your LED flasher project is much more of the one-time factor, you will want to take a look at other available choices.||LED SMD DownLight

    4026 Nick

        The 4026 combines a counter and seven segment LED driver. The seven-segment results along with a divide-by-ten output will drive eight LEDs. As the flashing won't be strictly random, once the lighting is correctly arranged, they will not possess a recognizable pattern. This circuit needs just the 4026, a 555 timer, LEDs along with a couple of passive components to really make it complete.

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