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Ledwiz Wiring

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Bambam1963:

I am seeking clarification on my addition of a Ledwiz to my cabinet for the sole purpose of lighting my controls.  I presently have all of my controls wired to an iPac.  I have connected my resistor to the short end of the LED (I am using standard coloured LED lights and not RGB lights).  I have then run the wire, which is connected to the resistor, to Ledwiz terminal number 1.  I have the soldered a wire to the long lead on the LED and have it daisy chained back to the 5vdc output on the Ledwiz.  Is this correct?  Additionally, can I attach LED lights to all ports numbered 1 through to 36?  My cabinet is a two player setup with 7 buttons per player as well as two buttons for my spinner and trackball, respectively.  There is also player 1 and player 2 coin and start buttons.  Therefore I have a total of 22 LED lights for each button to wire up.
How do most of you have your cabinets wired for LEDs?
Your assistance is always appreciated.

John

Bambam1963:

Here is a diagram of how I believe it should be wired up.  See attached diagram.
Thanks.

RandyT:

The diagram looks fine.  Daisy-chaining the power is ok, as long as you use a gauge of wire which is capable of handling the entire load of the circuit.  This method will also have the minor possible drawback that if the line is broken at some point in the chain, all leds past that point will no longer work until it's repaired.  This will only happen in the event of a physical break in the circuit, not if an LED simply burns out.  Another option is to set up a junction point for the +5v lines, with which this won't occur.

To gauge the fuse size required, you simply add up all of the components under the maximum load (i.e. 20ma x the number of LEDs) and add some percentage to allow for some headroom so as not to blow the fuse when there is no issue.  Usually 20% is fine, but that's for you to decide.  As you indicated, you only need the one on the +V line, unless you are connecting high current devices, at which point it may be prudent to protect those circuits individually.

Bambam1963:


--- Quote from: RandyT on January 11, 2014, 03:29:47 am ---The diagram looks fine.  Daisy-chaining the power is ok, as long as you use a gauge of wire which is capable of handling the entire load of the circuit.  This method will also have the minor possible drawback that if the line is broken at some point in the chain, all leds past that point will no longer work until it's repaired.  This will only happen in the event of a physical break in the circuit, not if an LED simply burns out.  Another option is to set up a junction point for the +5v lines, with which this won't occur.

To gauge the fuse size required, you simply add up all of the components under the maximum load (i.e. 20ma x the number of LEDs) and add some percentage to allow for some headroom so as not to blow the fuse when there is no issue.  Usually 20% is fine, but that's for you to decide.  As you indicated, you only need the one on the +V line, unless you are connecting high current devices, at which point it may be prudent to protect those circuits individually.

--- End quote ---

Thanks Randy.  I would like to update my diagram with all of the correct information and want to clarify the following. 

If I have 22 LED lights that are 20 ma each, that equals 440 ma plus 20% overhead would give me an answer of 528 ma fuse. 

How does one determine what size wire to use in this application (daisy chain)?  I have .22 ga wire.  Should I use .16 ga wire?

What size of resistor do you provide with each of the LED lights (3.3 to 3.5 vdc for the 5 vdc application?

Can the photo included in my diagram f the LEDWiz be used for the Wiki after it has been completed?

I will be updating the attached diagram and will include an alternate diagram to cover what you mentioned about feeding each LED with it's own 5 vdc power cable.  I initially was looking at the wiring diagram from your LEDWiz packaging and thought the 5 vdc wire ran from the 5 vdc output on the LEDWiz to each LED light.

Thank you for your time and I look forward to providing you with further business to support my William Widebody Pinball build after this control panel is completed.

John  :cheers:

Bambam1963:

Okay.  I have put together two diagrams for wiring of the LEDWiz.  Please correct me if I am wrong.

Option 1 is for the wiring of LED's where the total amperage does not exceed 500 ma?  Do I still need to hook up a ground cable to the ground outlet on the LEDWiz, or is the USB ground used in this case?

Option 2 is used when the LED total amperage exceeds 500 ma?

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