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… ...

“Arduino boards are able to read inputs – light on a sensor, a finger on a button, or a Twitter message – and turn it into an output – activating a motor, turning on an LED, publishing ...

I went a step further and bought 20 extension cables from China for ~$2 each. I snipped off the “wrong” end of the cable with about six inches of wire (in case I wanted to make a control someday).