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ATTiny3226 led dot matrix driver board

An ATTINY3226 dot matrix driver board for the LTP-305HR LED matrix chip, using Arduino.

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An ATTINY3226 dot matrix driver board for the LTP-305HR LED matrix chip, using Arduino.
Beta-Testers --> Henry Knoepfle, Benjamin Williamson. These are chainable boards thru the I2C bus, Have a 'scalable' LCD display, scrolling, or wire up as a 'TIL311' emulator.

Just got a notice from Digi-Key that the LTP-305HR matrix chip has officially become obsolete! So this project has now officially become RETRO!

rev1's are available.......

working on getting rev2 built and tested, ( picture with vqfn package, on the left ).

Simplistic Arduino Example files on GitHub ----> https://github.com/haroldmoore/Led-Dot-Matrix-display-board/tree/main

TIL311 Emulator mode is now working --- > 


files on github ----- >  https://github.com/haroldmoore/Led-Dot-Matrix-display-board/blob/main/matrixencoder1.zip

I found  WAY better encoder control firmware on github, here it

is :   

https://github.com/haroldmoore/Led-Dot-Matrix-display-board/blob/main/custom_encoder.zip

------------------------------------------------------------------------------------------------------------------------------------- The REV 2's are in!  The REV 2's are in!!  here is a short video ----> https://youtu.be/sF_6io8nx4A

Here is how the vqfn sits for soldering, looks like the three vias in the middle will have to be moved, so I can have a "lower fit", not to mention shorting out on the chips center pad!  So all is not lost, just have to re-spin some newer gerber files.

The socket pins will fit perfectly! Then when people wear out the obsolete, and extinct 5x7 dot matrix led chips, they can plug in a brand new one from EBAY.......

Soldering the small 20 pin 3mmX3mm VQFN is possible, here is a small video showing that it is in fact possible, if you have a small fan to blow away the solder fumes, and some magnification equipment, ( a loupe ) :-)    ----- >  https://youtu.be/VPb-hWagqgQ

Rev 2's are working OK, minor change to the control lines:

//################## Decimal Point Control ######################

//************************** rev1 *******************************
//---------------------------------------------------------------
//int rowPins[7] = {1, 14, 2, 3, 13, 12, 11}; //-program ROW pins
//---------------------------------------------------------------
//---------------------------------------------------------------
//int colPins[6] = {5, 4, 0, 10, 16, 15 }; //-program COLUMN pins
//---------------------------------------------------------------
//***************************************************************

//************************** rev2 *******************************
int rowPins[7] = {1, 16, 2, 3, 13, 12, 11};   //-program ROW pins
//***************************************************************
//***************************************************************
int colPins[6] = {5, 4, 0, 10, 15, 14 };   //-program COLUMN pins
//***************************************************************

//##########################################################

I'll make a video of the versions ( VQFN / SOIC ) , ( new / old ) here shortly.

https://youtu.be/t8oCzLpNPZM

Here is a short video using the smaller REV2 VQFN 5x7 matrix display boards  in a custom CLOCK application :   https://youtu.be/7QRXrlKybig

A more complete logger : 

point.jpg

I've noticed a LOT of people forget the decimal point led on the 5x7 matrix projects using the now extinct 305 display chip, my original code controls the decimal LED!

JPEG Image - 55.02 kB - 04/29/2022 at 00:18

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VQFN_SCH.jpg

schematic of new REV2 matrix display boards.

JPEG Image - 378.69 kB - 04/10/2022 at 23:15

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Matrix_led.jpg

Schematic , formally 'schematicus' of REV1 boards.

JPEG Image - 247.99 kB - 03/12/2022 at 14:48

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KE6JMG.gif

my ham call letters

Graphics Interchange Format - 8.00 MB - 03/04/2022 at 15:03

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haroldmoore016 wrote 02/17/2022 at 15:08 point

Look at the You Tube links!

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