24×6 LED Matrix Control Circuit


This is a 24×6 LED matrix control board based on Syst3mX schematics on Instructables. The board is connected on the LED matrix board and an external MCU or Arduino is required to produce the control signals that are feed on GP8.

Control Board Schematic


click on schematic full resolutionn

Description


The circuit is able to drive a 24×6 LED matrix using an external MCU or Arduino board.  The LED matrix columns are connected on JP1, JP2, JP3 and the 6 rows are connected on JP7. There is also the option to connect 2 more rows (total 8 rows) to make a 24×8 LED matrix.

The control is done externally applying the signals on JP8 as is shown on the diagramm below:

GND is the signal ground
VCC is 5V in reference to GND
RCK is SC signal of SPI (latch)
SCK is CLOCK signal of SPI
SER is DATA dignal of SPI
CLK is CLOCK signal of 4017
RES is RESET signal of 4017

Control signals can be easily generated by an Arduino UNO or Duemilanove using some code . You may refer to:

http://arduino.cc/en/Reference – general Arduino reference
http://arduino.cc/en/Reference/SPI – SPI Protocol reference

– Sample Code can be found here
– You can make your own symbols using this EXCEL sheet

– Check how 4017 IC is working: http://www.doctronics.co.uk/4017.htm

Parts

R25, R26, R27, R28, R30, R31, R32 6 x Resistors of 1k Ohms. SMD, 1206
The rest of resistors in the design 24 x Resistors of about 100 Ohms. SMD, 1206
IC1 1 x 4017 (decade counter) DIP
T1, T2, T3, T4, T5, T6, T7, T8 6 x 2N3904
IC2, IC3, IC4 3 x 74HC595 (shift register) DIP
JP1, JP2, JP3, JP6, JP7 5 x Pin Header (8×1)
4 x 3 mm screws  
   

Control Board PCB Designn


PCB board is practically a one side board with some wire bridges on top of it.

Eagle CAD PCB layout


 

Eagle CAD components layoutt

 Control boardPCB layout – Download PCB


 

3D Control Board PCB rendering

 

LEDBoard Schematicc


LED Board Schematic

LED Board PCB


LED board Egle CAD PCB layout

LED board PCB – Download PDF


 

3D LED Board PCB rendering

Downloadss


Download Control Board Eagle files

Download LED Board Eagle files

 


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