Hi I am creating display based on arduino uno, currently i am using max7219 displays (8 of them) I already managed to create an app for android to control max7219 display via bluetooth (from mobile i send text to the max7219 and it displays) but i dont understand how can i power up the whole system without burning anything. I asked this question before and received alot of answers and i understanded the best choice is to use 9 to 12 V adapter. If i understanded correctly each max7219 display of my kind is using 500mA The bluetooth module is using 30-40 mA during paring with device and 8 mA during communication. I tried to powerup 5 displays from computer usb and everything worked fine tho.
If i will use for example 12v 10A power adapter, will everything be good?
And i would like to know, should i use resistors and capacitors? I I read before that you should use 0.1uF capacitor per chip or 1 10uF cap per 3 matrix( soo 3 in total) and with resistors it was 3 100Ω for the whole project. But i am not sure about them, maybe i wont need them ( i read that information from a guy who made such display for his car and powered it from the car wires as understood) Thanks
This kind of matrixis i use.