If you’ve run out of I/O pins on a project and need a way to add user input you can find a slew of port expanders that work with various communications protocols like I2C and 1-Wire. But if y… ...

If you only had one pin, AND needed a pot and multiple buttons, this would work and I’m not sure your ladder would. If there was a good way to prevent the invalid double button press, perhaps it ...

PWM pins work the same way across all Arduino boards, so you don't need to go out of your way to buy a Mega if you already have a board supporting PWM. On the Uno, Nano, and Mini, the PWM pins are ...

If you take a look to the circuit scheme published in the Alphanumeric LCD with Shift Register on Arduino you can see that there is the pin number 9 that is NC (not connected). In the shift register ...