Im working on a 1: 25 model that consist of over 50 leds, about46 of them smd leds, and 4 are 3mm leds all being powered by a 5v breakout board and the Arduino The problem I'm having is getting 28 smd leds to fade in a sequence. I can get 3 on and fade just fine but when I add more, the leds starts losing voltage.
Here's the setup on the circuit board:
.5v USB power source to 5v breakout board
.Positive to 5v regulator input to 470uf compasitor to 100ohm resistor to Arduino 5v pin
.Ground from Adruino to breadboard
.Regulator to ground, positive output from regulator to 470uf compacitor to positive on breadboard.
.pins 9,10,11, programmed for fading sequence ( imitating rotating effect on old police lamps)
.pin 9 to transistor (same for pins 10 and 11)
.9, 10, and 11's transistors to ground
. Three 100uf compacitor to leds
.Leds back to transistors completing the circuit