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Topic: 8x64 MAX7219 LED Matrix wrong orientation (Read 27725 times) previous topic - next topic


hello there! I am new to this forum but very much interested in arduino projects. I am making a large 8x64 scrolling led display board using the max7219 ic chips, 10uf and 100nf capacitor on each chip.I am using the Maxmatrix library and the project works fine at the start but after some time, the message skips some matrices and appears on other while some other matrices will just turn on all leds and remain there untill i reset my arduino. Please help me


Hi dear ! I've seen your good projects in the net ... so i think you can give me some help ... (:-)
I have a simple 8x32 leds with max7219 (i.e. 4 digit)
And i want to achieve a STOPWATCH .... do you know if there are some info about this ?
(unfortunly i don't know program language for Arduino at the moment ...)
Tnk you for your attention, best regards


*I don't know your library *

name libbrary ->***Max72xxPanel*or*72xx*** change ---> matrix.setRotation(0, 1); or (0, 2);, (0, 3);

                         ***numberr 0 is Module Position ***can change it***

                         ***For example*** ---> matrix.setRotation(0, 3);  <--- ** Module 0 , look matrix (1,2 or 3)
                                                              matrix.setRotation(1, 3);  <--- ** Module 1 , look matrix (1,2 or 3)
                                                              matrix.setRotation(2, 3);  <--- ** Module 2 , look matrix (1,2 or 3)

name libbrary -->***MD_MAX72xx_h***

    ---> change moduleType_t

    PAROLA_HW        ///< Use the Parola style hardware modules.
    GENERIC_HW      ///< Use 'generic' style hardware modules commonly available.
    ICSTATION_HW   ///< Use ICStation style hardware module.
    FC16_HW            ///< Use FC-16 style hardware module.


to Paul__B

where would you put the capacitor and why?


The FC-16 modules do not have a position for such a capacitor (they do have "C1", a 100nF capacitor) but the older, non-stackable (well not easily) modules do - as the datasheet advises.

If using the four-gang FC-16 boards on which the links from one module to the next are on the PCB pattern (rather than requiring jumpers) then you have unpopulated "thru"s where you can solder the capacitors between "VCC" and "GND" which are already adjacent..  Using small capacitors, they can fit neatly on the component side under the display.

I must confess I have not added these capacitors on my modules, but decoupling is generally desirable, particularly if you have any significant distance between the modules and the Arduino.


hello there! I am trying to build a 8x72 large scrolling led board using the MD_Parola library. I am using 5mm leds at a separate distance of 3.5cm. I am using arduino uno and a series of 9 Maxim 7219CNG each chip with a 10uf/25v eleectrolytic capacitor and a 100nf ceramc capacitor in parallel with the voltage input i have also put a 10k 1/2W resistor at the iset pin of each chip. The project works nice for only 8 matrices but the 9th on remains either off or all leds lights on even when i define 9 devices on the program code. What could be the problem. Also sometimes some matrices just lits all the leds rather than printing the text. Help please


Could you share the full sketch of the LCD Clock Display? Thanks

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