Hi there Arduino Addicts!
Hardware & Programming/code question RE: LEDs
I've a sculpture that currently lights up using 4 pre-made LED boards. Each board has 16 LEDs with resistors inbuilt and runs off 12 VDC and approx 250-300 mA of current. I power all 4
boards using a regulated 12 VDC, 1.66 Amp power adapter/transformer.
My question is, using the Arduino Diecimila, how might the hardware and code be set up such that 2 of the 4 LED boards (red) do this cycle:
a). a 5 sec fade-in followed by,
b). remaining on for 20 sec,
c). fade-out in 5 sec,
d). remain off for 20 sec,
e). loop to a).
And then the other 2 boards (blue) do the same cycle but start with a 10 second delay
after the red boards...
I'm thinking that maybe using PWM trigger from a pin and some arrangement of resistors and transistor(s) (perhaps a TIP 120 transistor to handle the high current aspect from the PSU?)
If anyone has any ideas/code/circuit schematics to help, that would be truely awesome ;D - I have a basic knowledge of circuits, but not enough to figure this puppy out