Hacked Gadgets Forum

April 3, 2010

Touch Screen Hack for the TI 84 Plus Calculator

at 7:32 pm. Filed under Complex Hacks, Cool Gadgets, DIY Hacks, Electronic Hacks


Owen sent in his cool Touch Screen Hack for his TI 84 Plus Calculator. He is using an Arduino to read in the data from a Nintendo touch screen, the touch data is then sent to the calculator’s serial port so that it can then graph images based on where the screen is being touched. Did I mention that Owen is 16! I am trying to think what I was doing when I was 16, I am thinking something like adjusting the chain on my mountain bike.


“An especially cool thing that I managed to do was to hook my UART code into the calculator’s BASIC programming environment, so that I can send and receive bytes over the serial connection using a BASIC program (the programs that I am using to draw in the youtube video are written in BASIC). That also means that I don’t have to have a computer to write programs that use the serial port, turning the calculator into a sort of pocket universal interface for serial devices. I have written a small assembly program that automatically detects the speed of a serial connection, so you don’t necessarily need to know that piece of information for the device you want the calculator to talk to.”