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** SOLVED ** Think our posts crossed Fed the VCC for the second display direct from the 5v rail of the UNO board, not piggy backed from the first display. So, as you thought earlier, it has something to do with the diode on the board. I'll go and do some measuring :) (Edit - rail 5.4v. supply to fir...

Apologies, I didnt have the latest library. All compiled, loaded to board and same issue. I note that once loaded, if I press the boards reset button, the second display flashes all segments momentarily, but blanks and leaves nothing on the display. I've gone back to the UNO board as the Nano is new...

Thanks for the fast response I'm getting a compile error as follows: Arduino: 1.8.19 (Windows 10), Board: "Arduino Nano, ATmega328P (Old Bootloader)" C:\Users\xxxx\Documents\Arduino\sketch_apr12a\sketch_apr12a.ino: In function 'void setup()': sketch_apr12a:11:22: error: 'void HCMAX7219::Init()' is p...

Hi I have just purchased two MAX7219 7 segment LEDS displays (from Hobby Components via Amazon) and whilst I can get them working on their own with your HCMAX7219 library, I cannot seem to get them working in tandem. I have changed the NUMBEROFDRIVERS to 2 in HCMAX7219.h, changed the line HCMAX7219....