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Topic: Whats needed? 30x30 and 40x40 (Read 1 time) previous topic - next topic

Galardo

Hello i am relativley new to arduino so i want to know what is needed for a 30x30 matrix using straignt power from the wall socket.  If anyone can gimme a link or something on what parts i need.  Thanks :D

p.s. and also 30 x 40 :D

CrossRoads

You can easily obtain 5x7 and 8x8 matrices, and use parts like MAX6953 to drive the 5x7s and MAX7219/7221 to drive 8x8s.

24 5x7s arranged as 6 rows, 4 columns would yield 30 x 28
or 6x6, for 30 x 42
MAX6953 can drive four 5x7s.

20 8x8s as 4 rows, 5 columns yields 32 x 40,
or 5x5 for 40 x 40
MAX7219 drive 1 8x8 each.

Any of the arduino can drive all the parts, with maybe some shift registers to provide enough chip select lines if using the MAX7219/7221s.
The Max6953 is I2C, each can have 1 of 4 I2C 'addresses' so you could use an I2C mux also
http://www.dsscircuits.com/i2c-multiplexer.html

Alternately, use a mess of 8-bit shift registers with high current buffers that can drive up to 600 or 800mA (for 30 or 40 rows respectively) and write your own multiplexing code.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

Galardo

thanks much for the info...i did some research...and i figured i can us the peggy2 from evilmadscience and put the lights on a sphereical surface.  i have put a picture of what i want to do.

Galardo

or also how about instead of connecting the LEDs in a series but run them parallel and have 30 rows of lights with each row having 30?...could i do it that way too?

CrossRoads

Do they need to flash, turn on/off, anything?

30 LEDs in series - pick your LEDs, you could need a 60V supply if they were 2V Vforward LEDs.
Then up to 20mA/row * 30 = so a 600mA supply.

Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

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