“In a recent article I showed how an Arduino Pro Micro can be utilized to send characters to the serial console of the Raspberry Pi Zero W. The Pro Micro was chosen because it is small, inexpensive, and easily acquired plus the integrated USB port provides a convenient way to easily upgrade the programming. (Always disconnect the ProMicro Vcc from the RPi before inserting the USB micro cable into the Pro Micro.) This article will maintain all of the assumptions from the previously referenced article and will concentrate on the Arduino programming side by showing how easily multiple digital pins can be used in tandem to create a numeric value and then that numeric value can be used to call various functions to perform our requirements using just a single pushbutton to initiate communications with the RPi over the serial console.”