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New Small, Low-cost, ATmega328 Boards and LED Matrix

From: John L.
Sent on: Sunday, June 27, 2010 5:14 PM
At the last two MIT Swaps I introduced three new small,
low-cost, TH boards -- PICO1TRC, PICO1TR and PICO1TR-LED-L.
I also just received the PICO1TR panels (5x2). The schematic,
BOM, assembly prints and instructions are in the individual

2.1" x 1.65", ATmega328P, RTC + Battery backup,
Adjustable regulator, 0.6"x0.6" prototype
area, FTDI header, Arduino bootloader. Pricing is $20 each.

2.1" x 1", ATmega328P, Adjustable regulator, FTDI header,
Arduino bootloader. Introductory price is $12 each.

Kit containing a PICO1TR and PICO1TR-LED-L.
PICO1TR-LED-L is an 8x8 charlie-plexed matrix of
LEDs. There are options for six pushbuttons
and one pot. None of the SPI or I2C lines are used
for the matrix. Pricing is $30 (total for both kits)

PICO1TR Panels
5x2 panels of the PICO1TR boards. V-scored for
5-up or 10-up assembly. The panels snap vertically
into two identical 5x1 boards. The individual boards
snap horizontally. See

Software and Application Hints
For the PICO1TR-LED-L I wrote a library and Perl script.
The script converts an ASCII representation of the
LED matrix (space character = OFF, non-space character = ON)
into a packed binary array. The script generates a .c and .h
file that the library includes. The library, script
and two examples are at

For the PICO1TR-LED-L (and the future PICO1TR-LED-x) boards I have
generated drill templates that can be used to create wooden front
panels. Information about the drill template and the first wooden case
I made are at --
(A new video will be up as soon as the poly dries ;)

PICO1TRC RTC alarm interrupt example --
RTC Library -- http://wiblocks.l...­

(* jcl *)

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