Hello Arduino Forum, Most of the info on using the Arduino for controlling hundreds of LEDs is about either shift registers (74HC595) or multiplexers like Maxim7219. The number of 74HC595s needed to do 250 LEDS causes a space issue. So the 7219 was chosen. But the research on the 7219 turned up …

Maxim7219 to contoll 256 LEDS

Topic		Replies	Views
multiplexing and 1W LED's Interfacing	15	5562	May 6, 2021
How many 20mA LEDs can I hook up to Mega 2560 LEDs and Multiplexing	13	8099	May 6, 2021
Can't Light Multiple LEDs with MAX7219 and 5x7 Matrix LEDs and Multiplexing	15	7671	May 6, 2021
MAX7219-10 pieces LEDs and Multiplexing	10	4751	May 6, 2021
arduino, max7219 and a lot of leds Interfacing	6	3066	May 6, 2021