Harrison
Crettol

Building cool, accessible hardware and software. Documenting the engineering process so you can recreate it.

Project Archive
JUNE 2026

AI Chatbot Behind a Cloud Function

A Gemini-powered assistant wired into a live site — with the API key proxied through a Firebase Cloud Function so it never touches the browser.

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MAY 2026

Physical vs Software Button

Replacing hardware components with code. I spun up an ESP32 local web server with background JavaScript to control a physical LED natively from an iPad without page refreshes.

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The Butter Robot

A Rick and Morty replica hacked together using a 3D printed claw, Legos, electrical tape, and some micro servos. Programmed specifically to realize its only purpose is passing butter.

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3D Printed ESP32 Claw

A custom-built robotic gripper powered by an ESP32 and an MG90 360-degree continuous rotation servo, controlled via a local Wi-Fi web dashboard.

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DIY Plasma Cannon

Built a 2-gallon combustion chamber to test a propane-air mix, creating a massive blue plasma wave through clear vinyl tubing.

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Cyber-Physical Lego Car

Turned a 20-year-old Lego car into a Bluetooth RC rover using an ESP32, a stepper motor, and a homemade iOS app.

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Python Groundhog Tracker

An edge-computing surveillance system running on Xubuntu. Uses OpenCV's MOG2 background subtraction to autonomously track, record, and format high-definition footage of backyard wildlife.

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ATM Jackpotting Demo

A mock hardware setup demonstrating a cyber-physical systems exploit. Built to safely test and document ATM vulnerabilities.

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Allergy Insight

An environmental monitoring system and analysis project completed as part of my senior design coursework.

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In Development

Wunderwaffe DG-2 Replica

Making a high-voltage prop replica from Call of Duty Zombies.

In Progress