Does anyone has any idea?
Like I said, no matter what code I put, but I was trying to run a code from the book beginning arduino chap 21 that teaches how to drive a led display with the max 7219.
LED Forward Voltage 1.5V 2.0V 2.5V 3.0V 3.5V For 40mA 12.2k? 11.8k? 11.0k? 10.6k? 9.69k? For 30mA 17.8k? 17.1k? 15.8k? 15.0k? 14.0k? For 20mA 29.8k? 28.0k? 25.9k? 24.5k? 22.6k? For 10mA 66.7k? 63.7k? 59.3k? 55.4k? 51.2k?
Well I didn't put the capacitors, because it said it's not mandatory. I will buy the capacitors and try again. I attached the code of the book. I tried to modify the text in there and sometimes it runs well, depending on the text that's written. I guess there's something with the code, trying to figure out what...