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  • 68K commented on WhiteClockCompany's instructable IKEA Ribba Word Clock3 months ago
    IKEA Ribba Word Clock

    To answer my own question - I replaced the 300K ohm resistor with a 470 ohm one and the LEDs burst into life.

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  • 68K commented on WhiteClockCompany's instructable IKEA Ribba Word Clock3 months ago
    IKEA Ribba Word Clock

    Thanks. I set up the Ardunio Mega last night with the other components and connected the LED board to it. Despite having good continuity from the Arduino power output to the LED rails and confirming that my data pin was connected well to the Arduino via the resistor, I couldn't get any LEDs to show using the Adafruit test code. A little baffled as to what could be the problem. I shall persist...

    I just noticed that that the Arduino code screenshot says to use a 300 to 500 Ohm resistor between the Ardunio Pin 6 and the LED strip data line, but you say to use a 300K Ohm resistor. So is it 300 or 300K?

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  • 68K commented on WhiteClockCompany's instructable IKEA Ribba Word Clock3 months ago
    IKEA Ribba Word Clock

    Also, would some more consideration be required if it was desired to light all the LEDs (assume I've modified the code to add some animation). Looks like all 144 LEDs will require close to 3A.

    Would it be possible to see a higher-level diagram of how you connected the LED strip to the Mega? It looks like the wires from the LED strips aren't showing in the image where you show the breadboard. I am guessing that the Arduino is getting power from the USB connector, which you then feed out to the breadboard via those side-by-side wires?The LED strip + and - wires then go into the vertical rails similar to the capacitor, and the data line from the LED strip goes to the right-hand side of that resistor. Am I correct?With my clock, I've already connected all the LED strips together with the wire bridges. Will powering the Arduino via the USB port be enough juice to light all the LEDs or should I power it via the input jack as well?

    Would it be possible to see a higher-level diagram of how you connected the LED strip to the Mega? It looks like the wires from the LED strips aren't showing in the image where you show the breadboard. I am guessing that the Arduino is getting power from the USB connector, which you then feed out to the breadboard via those side-by-side wires?

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