Arduino nixie v41, Руководство по эксплуатации

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And for the external components, showing how they are connected.
One side of the LDR and switch are connected to ground (pin 1, SV2).
The LEDs are driven from VCC or VIN, depending on the configuration. Here are some suggestions:
1 TICK LED:
Run the TICK LED directly from the board, either from VCC or VIN.
2 TICK LEDs:
Run the two TICK LEDs in series from VIN. You don't need a balancing resistor because the LEDs are in
series.
4 TICK LEDs:
Run the TICK LEDs by putting 2 in series, and running the two series combinations in parallel. In this case
you need a 1k balancing resistor in each series.
1 RGB Back Light LED:
Run the RGB LED directly from the board, either from VCC or VIN.
Multiple RGB Back Light LEDs:
Each RGB LED needs a series balancing resistor on each Red, Green and Blue cathode. I normally run 6 in
this configuration.