Hardware Project — 2024

AI-84

"Bridging 1990s Hardware with 21st Century Intelligence."

STATUS: ONLINE

👁 — people viewing this page

The AI-84 is a hardware-level modification that integrates a Seeed Studio XIAO ESP32S3 Sense microcontroller into a TI-84 Plus. By connecting to the calculator's link port and injecting custom firmware, the device sends queries to OpenAI's GPT-5.4 API over Wi-Fi — and uses the ESP32S3's onboard camera for GPT-5.4 Vision, allowing the AI to literally see the calculator's screen.

GPT-5.4 Online

Wi-Fi Active

Camera Ready

1.1s latency

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Technical Specifications

Under the Hood

⚡

Microcontroller

Seeed Studio XIAO ESP32S3 Sense

Dual-core Xtensa LX7 · Integrated Wi-Fi 802.11 b/g/n · Onboard OV3660 Camera Module

🧠

AI Model

GPT-5.4 + Vision

OpenAI REST API via HTTPS · JSON-buffered responses

🔌

Link Port Protocol

Hyper-Link Protocol Engine

TI-84 Plus 2.5mm port · Tip/Ring/Sleeve pinout · BASIC program injection

⚙️

Firmware

Custom C++ / Arduino IDE

JSON parsing · Stream rendering · Link port handshake protocol

📡

Logic Interfacing

3.3V Native Logic

ESP32S3 3.3V compatible with TI-84 Plus logic gates · No external level shifting required

🔋

Power

AAA Battery Rail Tap

Powered via USB-C passthrough or existing AAA battery rail · Zero external wires

Development Process

How It Was Built

Phase I

The Teardown

Reverse engineering the TI-84 Plus motherboard to identify and map the link port pinout. Documented the tip/ring/sleeve signal lines and validated voltage levels for compatibility with the ESP32S3's 3.3V GPIO.

Phase II

Hardware Integration

Precision soldering of the XIAO ESP32S3 Sense module for a flush, internal fit within the original TI-84 casing. Camera module positioned to capture screen output. Zero external wires — fully invisible integration.

Phase III

Firmware & Link Protocol

Building the Hyper-Link Protocol Engine from scratch in Arduino C++, implementing the TI serial protocol, and developing the BASIC program injection pipeline to push AI-generated code directly onto the calculator.

Phase IV

API Bridge & Optimization

Implementing HTTPS REST calls to GPT-5.4, optimizing JSON parsing for embedded constraints, and building stream-based text rendering for near real-time LCD responses on the calculator's screen.

Phase V

Vision Pipeline

Integrating the onboard OV3660 camera with the GPT-5.4 Vision API, enabling the AI to capture and interpret the calculator's current screen state — making queries context-aware without manual input.

Key Features

What It Can Do

🔲

Invisible Integration

The ESP32S3 is housed entirely within the original TI-84 casing. No external wires, no visible modifications — it looks exactly like a stock calculator.

📡

Wi-Fi Enabled

Connects to any WPA2 hotspot for on-the-go GPT-5.4 queries. Works with mobile hotspots — no dedicated network required.

👁️

Vision Capable

The onboard camera captures the calculator's screen and feeds it directly to GPT-5.4 Vision — the AI can see exactly what problem you're working on.

⚡

Low Latency

Optimized embedded JSON parser and stream rendering pipeline deliver near-instant responses direct to the TI-84's LCD display.

💾

BASIC Injection

AI-generated TI-BASIC programs are transferred directly onto the calculator over the link port — no cables, no computer required.

🔋

Battery Integrated

Taps the existing AAA battery rail internally. No additional batteries, no charging port — completely self-contained.

Feature Deep Dive

Everything your calculator never had

A hardware modification that adds real AI, note storage, a math solver, and more — invisibly — to your TI-84.

ai84 — gpt-5.4 — active

▶ Wi-Fi: CONNECTED

▶ GPT-5.4: READY

// TI-84 link port: query received

Q: integrate x² dx

A: x³/3 + C

latency: 1.1s · tokens: 24

Awaiting next query

ai84 — math-solver — step-by-step

// Step-by-step solver

Q: 3x² + 5x − 2 = 0

① Identify: a=3, b=5, c=−2

② Discriminant: 25+24 = 49

③ x = (−5 ± 7) / 6

✓ x = ⅓ or x = −2

ai84 — notes — 3 saved

// Stored notes · BASIC inject

[1] Chem formulas - ch7

[2] Physics: F=ma, E=mc²

[3] History essay outline

▶ Load note [2] → injecting...

Transferred to TI-84

ai84 — games — BASIC inject

// AI-generated game injection

▶ Prompt: "snake game TI-84"

✓ Generated 47-line BASIC

✓ Syntax checked

▶ Injecting over link port

Transferring

Comparison

How AI-84 stacks up

Stock TI-84 Plus

Standard graphing calculator

GPT-5.4 AI ✗

Wi-Fi ✗

Camera / Vision ✗

Step-by-step solver ✗

BASIC injection ✗

AI note generation ✗

Invisible integration —

Looks stock ✓

AI-84
Hand-built · Queens, NY
Recommended
GPT-5.4 AI              ✓
Wi-Fi                   ✓
Camera / Vision         Vision Pro
Step-by-step solver     ✓
BASIC injection         ✓
AI note generation      ✓
Invisible integration   ✓
Looks stock             ✓

Other Mods

Typical calculator AI mods

GPT-5.4 AI ✗

Wi-Fi ✓

Camera / Vision ✗

Step-by-step solver —

BASIC injection ✗

AI note generation ✗

Invisible integration ✗

Looks stock —

Shop

Get Your AI-84

⚠ ONLY 5 UNITS IN STOCK — order soon

Hand-built hardware units. Click any product to learn more and order.

Hardware Units

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AI-84 Standard

GPT-5.4 integrated. Wi-Fi enabled. Invisible mod.

$129

worldwide shipping

ESP32S3 GPT-5.4 Wi-Fi BASIC Inject

Limited Stock

AI-84 Vision Pro 3MP

Everything in Standard + GPT-5.4 Vision camera system.

$179

worldwide shipping

ESP32S3 Sense GPT-5.4 Vision OV3660 Cam BASIC Inject

New

AI-84 Vision Pro 5MP

Premium 5MP OV5640 + Autofocus. Sharper. Faster. Clearer.

$225

worldwide shipping

ESP32-S3 GPT-5.4 Vision 5MP OV5640 Autofocus BASIC Inject

DIY Build

Want to build your own AI-84? Join the Discord and we'll walk you through it.

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📍 NYC Pickup — No Shipping Fee

Live in NYC? Pick it up in person.

Skip shipping and pick up your AI-84 directly. Available for New York City residents only — pickup location shared by email after order confirmation.

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Build Log

Changelog

v1.3

OTA update support + config portal overhaul

Firmware can now update over-the-air via Wi-Fi. Config portal rewritten for faster credential entry. Link port timing improved.

Mar 2025

v1.2

GPT-5.4 Vision integration shipped

Camera pipeline integrated with OV3660. JPEG streaming to GPT-5.4 Vision endpoint working. ESP32S3 Sense variant now supported.

Jan 2025

v1.1

BASIC token injection fix + JSON parser rewrite

Fixed critical bug where BASIC tokens were being sent raw instead of compiled. JSON response parser rewritten to handle chunked streams.

Dec 2024

v1.0

Initial release — AI-84 goes live

First working prototype. GPT-5.4 responses over Wi-Fi via link port. XIAO ESP32C3 variant. Site launched at ai84calc.com.

Nov 2024

Your questions answered

Standard shipping takes 5–7 business days after your order is built and processed. Each unit is hand-built to order so please allow 1–2 days for assembly before shipping. You'll receive a tracking email once your order ships.

We accept all major credit and debit cards via Stripe, as well as PayPal and Venmo. All payments are processed securely — we never store your card information.

You have up to 1 hour after placing your order to request a change or cancellation, and only for a valid reason. After that window your order enters the build queue and cannot be modified. To request a cancellation contact us immediately through our Discord server.

Yes we do! For international orders please open a ticket in our Discord server and our team will assist you with shipping options and rates to your country.

The AI-84 connects via WPA2 Wi-Fi — any hotspot works, including your phone's mobile hotspot. You configure your network credentials once through the companion app (AI84Base). After that, the ESP32 handles everything automatically. You interact entirely through your calculator's buttons and screen, no phone needed during use.

No — that's one of the core design goals. The ESP32 module is housed entirely inside the original TI-84 casing with no external wires or visible modifications. The Standard model is completely invisible. The Vision Pro has a small camera module in the top-right corner, which is the only visible difference.

The AI-84 currently supports the TI-84 Plus (original model). The firmware and link port protocol are specifically designed for its 2.5mm serial port. Support for additional TI calculator models may be explored in the future.

Yes — every unit ships with a 30-day warranty. If your unit has a hardware defect or is damaged during transit, contact us and we'll make it right. For issues outside the warranty window, open a ticket in our Discord and we'll do our best to help.

Can't find what you're looking for? Contact our customer support team →

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4x AAA batteries for extended use.

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AI-84

Under the Hood

How It Was Built

What It Can Do

Everything your calculator never had

How AI-84 stacks up

Live Interface

Get Your AI-84

Live in NYC? Pick it up in person.

Pickup is NYC Only

Changelog

Your questions answered

Ace your exam
with AI-84

AI-84

Under the Hood

How It Was Built

What It Can Do

Everything your calculator never had

How AI-84 stacks up

Live Interface

Get Your AI-84

Live in NYC? Pick it up in person.

Pickup is NYC Only

Changelog

Your questions answered

Ace your examwith AI-84

You're on the list.

Ace your exam
with AI-84