This is a handheld Arduino football scoreboard project. It consists of 7 cascaded MAX7219 IC's with 7 of the small 32 x 32mm common cathode 8x8 led matrix displays. By connecting 5 buttons to the unit you can score as follows Home - Up/Down, Away Up/Down and reset. Score does not go below zero no matter how many times you press the dwon buttons and as soon as you hit the up button it will start counting and the unit flashes the word goal in the score windows then shows the score. The unit counts up to 99 then rolls over to zero and you can start again, or to reset just hit the reset button. Can be powered by FTDI lead from a PC, 4 x 1.5V AA batteries or a 5V DC power supply, the unit draws about < 200mA maximum so will last for some time on just batteries. The kit I am supplying consists of 3 items. The pcb, a programed Atmega 328 ready to go and a DIP socket.

You will need to get the following. 7 small 8x8 common cathode 32mm LED matrix kits including MAX7219 chip, 10k resistor, 100n capacitor and 10uF, 25V electrolytic capacitor.

2 - 22pF polyester capacitors. 1 - 16MHz crystal. 1 - 1n4148 diode. 1 - 1uF 25v electrolytic capacitor. 2 - 100n polyester disc capacitors. 2 - 10k 1/4 watt resistors. 0.1" pitch headers to suit your requirements or leave off if you want to solder wires directly to the pcb. 5 - momentary push button switches.

Full bom and step by step build instructions will be supplied with the kit.

READ VERY CAREFULLY - the big brother of these devices is going in to full production, the same Arduino code is used within that design so unfortunately the code will not be published in any form anywhere.

My suggestion is that if you want to experiment uploading to the board or use it as a cascaded 7 module MAX7219 device. Fit your own bootloaded ATMega328 connect up the FTDI lead and experiment away. when you have finished and want to use it as a scoreboard again, pop the programmed chip supplied with the kit back in.

Look on the Arduino forum for Parola's amazing MAX7219 code libraries to guide you into programming a seven way cascaded matrix display.