arduino-guay:
The ULN2003A is a driver for manage the power RGB led, in the example is a 5W led.
That is a powerful led then. if i were using a simple 5mm RGB led with supply of 4V would I still need that IC? I see on ebay the color rgb remote control is sold with the IR receiver. What if I went with the more complex remote, would the sketch be any different? I see some sell with "gift" 4 pin male connectors having wire output. Seems usefully if i were going to use the purchased IR. Also there is another item sold with remote and IR Controller. That also seems useful. What are the perks of each?