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What Voltage For The L.E.D's on the AVR Board.

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by tonyuk100, Sep 2, 2009.

  1. tonyuk100

    tonyuk100 New Member

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    AVR boards ordered today so i've been to my local maplins shop to buy the bit n pieces, Can anyone tell me what voltage LED's i need as the guy in the shop said you can get all different voltages. It dont state it the parts list, it just says red led and green led, and are they the same voltage LED's for the AVR Board and the H-Bridge Board. Thanks for any help.
  2. Ads Master

    Ads Master

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  3. R-eng

    R-eng Member

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    You're going to drive the LEDs with 5VDC supplied with the AMC, and control the voltage through it with the associated resistor. The MCD of the LED is the inherent brightness factor (higher is brighter, >18 is good, spec'd at typ. operating voltage), and it will dim as the resistor value goes up. This resistor could vary between 100 to 1K ohms and is not highly critical. I have not heard of a specific voltage LED, but they do have limits to max operating voltage they can handle. I have used 19 MCD at 2.1V typ. with good results. They can be the same on the DSMhb, and different colors will output varying levels of MCD. You could try to match the MCD@Op Volts typ., or just vary the resistors until they have similar brightness levels. But try to keep them similar in output level.

    R-eng
  4. tonyuk100

    tonyuk100 New Member

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    thanks R-eng, ill try to get the same 1's your using as i know they work ok because you have them in yours. Tony.