What is IC1?
7408 and IC
i meant AND ic
What does it do?
The LEDs can all be driven thru the IO pins shown:
D1 = 1, D0 = 0 turns on LED1
D1 = 0, D0 = 1 turns on LED2
D1 = D0 turns LED1 & LED2 off
same for 3,4 5,6 7,8
What's the AND gate do that couldn't be done with another IO pin instead?
pranoy:
this is a fair ckt dgm with only one yellow LED
Regarding that diagram, the pins that go through a resistor to the LEDs should not be connected to the input of the AND gate, this should be connected directly to the arduino. I suspect that it is this that is causing a problem because the current flowing through that resistor is holding the input to the AND high and thus keeping the yellow on, which still needs its own series resistor.
cross roads
AND gate is for turning LED 3 ON D0-1 & D1-1