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Topic: 8x8 Matrix, only half the LED's at full brightness (Read 692 times) previous topic - next topic

monsteryeti

Ok so I'm new to this so please go easy on me. This is my 4-5 project with my new Arduino Mega2560 board and I'm following a tutorial from http://oomlout.com/8X8M/8X8M-Guide.pdf.
ok so i have built the breadboard up as described and double checked all my connections twice now.

THE PROBLEM.
So i have uploaded the sketch from http://tinyurl.com/yjozkrr to my board at that went through with zero problems but my 8x8 matrix is only lit on the bottom 4 rows as if you were looking from above. The top 4 rows are lit but very dim. Now these rows are connected to PWM pins 13-8 so i tested these with a simple blink LED test and they light the LED to 100% brightness???? so i tried the Knight Rider array from the examples and this works fine on PWM pins 7-2 but if i move and alter the sketch for PWM 13-8 i get dim led's.

Am i doing something really stupid here or am I just not understand the board and the sketch??

All Help given will be appreciated.
Many thanks!!
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MarkT

One common cause for very dim outputs is failing to call pinMode(pin, OUTPUT), so you only get the weak internal pullups sourcing current.
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monsteryeti

#2
Jul 05, 2012, 03:08 pm Last Edit: Jul 05, 2012, 03:11 pm by monsteryeti Reason: 1

One common cause for very dim outputs is failing to call pinMode(pin, OUTPUT), so you only get the weak internal pullups sourcing current.

Cheers I will check that out, like I said new to it but learning through trial and error and laughing at my stupidity all the way

Video off my problem
http://www.youtube.com/watch?v=CqalV86Mufw&sns=em

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