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Start Light Gantry with Arduino Uno Analog pins (5 Red & 1 Green dual rows)

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  • Start Light Gantry with Arduino Uno Analog pins (5 Red & 1 Green dual rows)

    Building up a new light Gantry for 1:32

    Existing Gantry is using Race Corrdinator Analog A0 thru A4 for RED
    New Gantry will use Race Corrdinator Analog A0 thru A4 for RED and A5 for Green

    Existing LED's are wired with a series 220 ohm resistor (Arduino UNO spec at 20 mA). This probably is assuming the LED voltage drop is 2V and 3V across 220 ohm resisor gives approx 15mA. Make sesnse?

    Proposed Gantry looks like this

    Debating if I should use either;
    1) two LED's in series with single resistor, logic from above would be resistor needs to be 68 ohms (2V per diode, 1V across resisot rat 15mA.
    2) two LED's in parallel with a single resistor, logic from above would be resistor needs to be 100 ohms (2V LED, 3V Resisor at two 15mA for each LED).

    Thoughts?

  • #2
    “Best practice” is to use separate (parallel) load resistance for each LED. The 2V forward voltage per red LED is a nominal value - which means it can vary. Using individual resistances means you can adjust the resistor values so that the LEDs are of equivalent brightness (if that matters to you).
    Don’t forget that the green LEDs may have a slightly different forward voltage.

    Regards,
    BBB

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