On Saturday, a YouTube creator called ChromaLock published a video detailing how he modified a Texas Instruments TI-84 graphing calculator to connect to the internet and access OpenAI’s ChatGPT, potentially enabling students to cheat on tests. The video, titled “I Made the Ultimate Cheating Device,” demonstrates a custom hardware modification that allows users of the graphing calculator to type in problems sent to ChatGPT using the keypad and receive live responses on the screen.

ChromaLock began by exploring the calculator’s link port, typically used for transferring educational programs between devices. He then designed a custom circuit board he calls “TI-32” that incorporates a tiny Wi-Fi-enabled microcontroller, the Seed Studio ESP32-C3 (which costs about $5), along with other components to interface with the calculator’s systems.

It’s worth noting that the TI-32 hack isn’t a commercial project. Replicating ChromaLock’s work would involve purchasing a TI-84 calculator, a Seed Studio ESP32-C3 microcontroller, and various electronic components, and fabricating a custom PCB based on ChromaLock’s design, which is available online.

The creator says he encountered several engineering challenges during development, including voltage incompatibilities and signal integrity issues. After developing multiple versions, ChromaLock successfully installed the custom board into the calculator’s housing without any visible signs of modifications from the outside.

To accompany the hardware, ChromaLock developed custom software for the microcontroller and the calculator, which is available open source on GitHub. The system simulates another TI-84, allowing people to use the calculator’s built-in “send” and “get” commands to transfer files. This allows a user to easily download a launcher program that provides access to various “applets” designed for cheating.

One of the applets is a ChatGPT interface that might be most useful for answering short questions, but it has a drawback in that it’s slow and cumbersome to type in long alphanumeric questions on the limited keypad.

Beyond the ChatGPT interface, the device offers several other cheating tools. An image browser allows users to access pre-prepared visual aids stored on the central server. The app browser feature enables students to download not only games for post-exam entertainment but also text-based cheat sheets disguised as program source code. ChromaLock even hinted at a future video discussing a camera feature, though details were sparse in the current demo.

ChromaLock claims his new device can bypass common anti-cheating measures. The launcher program can be downloaded on-demand, avoiding detection if a teacher inspects or clears the calculator’s memory before a test. The modification can also supposedly break calculators out of Test Mode, a locked-down state used to prevent cheating.

While the video presents the project as a technical achievement, consulting ChatGPT during a test on your calculator almost certainly represents an ethical breach and/or a form of academic dishonesty that could get you in serious trouble at most schools. So tread carefully, study hard, and remember to eat your Wheaties.

This story originally appeared on Ars Technica.



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