But if you just want to add in some buttons without reaching for an extra IC you’ll love this hack. [John Boxall] shows how to add four buttons using one ADC pin. The concept is nothing new.

[Kevin Fodor] shares his method of reading multiple inputs on one pin of a microcontroller ... that provides a unique voltage value for each button pushed. The only real drawback is that the ...

But the library only manages one shift register, while we want to use more, daisy-chained devices. In our case four devices. The four daisy-chained shift registers circuit can be considered as an ...

However, these two areas are where the Arduino Mega shines. It's built with 256 KB of flash memory and over 50 pins, perfect for managing larger and more demanding projects with multiple components.

Makers, developers and hobbyists that enjoy tinkering with Arduino ... button that is slightly larger than a microSD card yet provides a wealth of functionality that can be integrated into one ...

But what happens when you connect the VCC common anode of the board to one of the free digital pins of the Arduino? Setting the common anode digital pin to HIGH, we power on the entire display board ...