I'm able to control an RC boat using my TI-84+ Calculator! Originally posted in 2017 at https://www.cemetech.net/forum/viewtopic.php?t=13876

I used a library called ArTICL to interface between an Arduino and TI-84+ Calculator: https://github.com/KermMartian/ArTICL

To start the boat forward, press the UP arrow. To stop the boat, press the DOWN arrow. To make the boat turn left, press the LEFT arrow. To turn the boat right, press the RIGHT arrow.

GND -> GND vcc -> 3.3V CE -> 9 CSN -> 10 SCK -> 13 MOSI-> 11 MISO-> 12

RED -> 7 WHITE-> 6

GND -> GND vcc -> 3.3V CE -> 9 CSN -> 10 SCK -> 13 MOSI-> 11 MISO-> 12