I am trying to figure out how to control my several 7 segments. But right now I just want to get one working and working out the bugs first. Scaling later should be just a matter of determining if I have enough amps.
The 7 segment I am working with is a common cathode with a 8 Forward Voltage. I have it so it is what I am working with. I understand it is supposed to be easier to work with a common anode.
I am working with an Uno R3.
I worked with a smaller 7 segment display and got it to work with a MAX7219 but I realized later that it was a common anode display. I found I couldn't get the MAX7219 to work with the larger display due to lack of knowledge.
So I just wanted to start with a new setup for the larger display. From what I understand I need a current source driver. I am looking for one that can handle up to 3 7-segment displays. I was thinking of running this with a 9 volt wall wart unless you guys think I should go with a 12.
Found this going to look more into the TLC5940. http://forum.arduino.cc/index.php?topic=18091.15
Based on rough calculations. I am assuming that the voltage for the display is 50mA for each LED. Each segment has 4 LED's so that would mean minimum power for the display required is around 4.2A. Then I would probably need another 500mA for the arduino and misc. If I use their spec of 30mA per LED for steady current then I would only need 3.15A but I am worried of the display being under-powered and won't light up.
Overall project is going to be a skeeball machine for fun.