Instead of the relative horror of driving 40 LEDs with a single Arduino, [Martyn] bit the bullet and got a Maxim 7221 LED driver. Controlling 64 LEDs over a three-wire interface simplified the ...

There’s his DIY LED display controlled by an Arduino UNO. To have some text or ... And as if that wasn’t enough, he’s hacked a quartz driver board from an analog clock to use the display ...