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Topic: First LED Chaser and Curious Problem (Read 907 times) previous topic - next topic

orangeman555

I attempted to make an LED chaser with pins 1-7.

I have them switching with a for-loop, with the counter choosing the pin to light up.

for(count = 0; count<=7; count++){...

You get the idea.

Strangely a few of the pins seem rather weak! They barely light up the LED. So it appears to skip an LED in sequence.

I was wondering what might cause this? I'm still quite new to Arduino.

Grumpy_Mike

Don't use pins 0 & 1 there are fore the serial port.
All the pins you do use must be declaired as outputs in setup using pinMode
Use resistors with each LED.

orangeman555

Thanks. I was a little skeptical about those first two pins.

All the pins share a resister before they go to ground - no two are lit up at the same time.

Thanks!

Grumpy_Mike

Quote
All the pins share a resister before they go to ground

As long as no two are one that is fine. If more then one is on then the brightness will change the more are on.

orangeman555

Not to go off-topic, but where can I find a guide to all the pins of the microcontroller?

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