COMPLETE Heated Bed LED.

Discussion in 'Guides, Mods, and Upgrades' started by SoBaldrick, Mar 26, 2016.

  1. SoBaldrick

    SoBaldrick Well-Known Member

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    On the rear of the heated bed by the connector, looks like there is a place to fit a resistor and LED to show heated bed on/off, is this correct, also I presume this is across the 24v bed feed.
     
  2. Alex9779

    Alex9779 Moderator
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    Yup it is. You have space for a series resistor too. On the first prototypes of the bed we saw a LED showing when the bed is on. For the final version they removed it but the solder points are still there if you wanna add it yourself...
     
  3. Rob Heinzonly

    Rob Heinzonly Well-Known Member

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    Be aware that you cannot mount a normal 5mm LED directly on the PCB. I did this and it collided with the fan holders on the printhead. I think you have to go for a SMD Led...
     
  4. jawaswag

    jawaswag Member

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    I was thinking of printing a translucent "BED HEATING!" and inserting red LEDs in it, mounting it at the front and running the wires from the connectors on the bed.
     
  5. SoBaldrick

    SoBaldrick Well-Known Member

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    i've got some nice SMD LEDs i can use, just wanted to confirm though.
     
  6. R Design

    R Design Well-Known Member

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    @SoBaldrick Remember to check the forward voltage in the datasheet for your LED. And see what sort of current it's appropriate to drive them with.

    Then you can calculate a value for the resistor such that:

    (Bed voltage - Forward volage of LED) / Resistor Value = the current you want to flow through the LED

    I guess it will be something like:

    (24v - 2.5v) / R = 0.01 A

    In which case R is about a 2k resistor.
     
    Spoon Unit likes this.

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