Go Down

Topic: RGB LED MATRIX, speed-up and i2c (Read 1 time) previous topic - next topic

CvMeer

Hello!

I`m working on a prototype RGB matrix board.
It houses two rgb matrixes (final version will have 4 matrixes + a touchscreen).

Each matrix is controlled by:

  • One atmega168 tqfp

  • 3x 74hc595 for sinking the collumns

  • 8x P-fet for sourcing the rows



I don`t have a schematic, but here is the board design:
http://www.newwave-is.nl/files/matrixboard.png
Here is a video of what it does now:
http://www.newwave-is.nl/files/matrixvid.mp4


The first question i have is about speed.
It can do 5 levels of brightness now (without very noticeable flicker), but it would be nice if that can be cranked up a bit.

Am i using the SPI in the optimal way?
Or does someone see anything in the pixel reading/writing that`s clearly slow.



The second question:
Originally i wanted to control the 2-4 matrixes with another atmega (which also reads the touchscreen) via I2C.
But i noticed i cant include the TWI Library if i am using TimerOne (for writing to the matrix).

Can i make I2C run on a diffrent timer? Or should i run my rgb interrupt via another timer? (I believe the atmega168 can`t use TimerThree (wich has a library) )


Here is my code:
http://www.newwave-is.nl/files/verse_tst.pde


Thanks!

Go Up
 


Please enter a valid email to subscribe

Confirm your email address

We need to confirm your email address.
To complete the subscription, please click the link in the email we just sent you.

Thank you for subscribing!

Arduino
via Egeo 16
Torino, 10131
Italy