🐇 BuniBuni — The Hopping Robot Rabbit

BuniBuni is a minimalist, expressive robot rabbit built with an Arduino Nano, MG90S servos, and a chaotic wiring philosophy. It hops, turns, stretches, and reacts to IR remote commands — all while staying light enough to actually leave the ground.

🎯 Features

• Hops using coordinated servo thrust
• Turns left and right with tank-steering-like leg motion
• Stretches dramatically (and painfully)
• IR Remote Controlled for wireless command input
• You get your own Lightweight chassis with recommended 20% PLA infill
• Optional rubber feet so BuniBuni doesn't headbutt you

🧠 Tech Specs

Component	Description
Microcontroller	Arduino Nano
Servos	4× MG90S (metal gear)
Power	5V 4A battery or USB power bank
Control	IR receiver + remote
Body	You find it
Legs	You find them

🛠️ How It Works

Each motion is triggered by an IR remote command:

Command	Action
0x2	Hop
0xE0	Turn Left
0x90	Turn Right
0xA8	Stretch

But, since this is open source, you can customize the INO to work with your IR remote!

📦 Files

• Softwarez/BuniBuni.ino — Arduino sketch. Sketch
• Softwarez/Dependencies.txt — The libraries you'll need (note: this is Arduino, not Python, so you can't just arduinonano install Dependencies.txt)! Dependencies
• Body/parts_list.xlsx — Components and links. List
• Body/body_design_notes.md — Useful design notes and printing tips! Body design notes

📹 Demo

Watch BuniBuni hop and stretch on (Not available yet).

🧪 Build Talk

“No ears, no tail — just hop and be cool.”

BuniBuni is designed to be light enough to jump, expressive enough to feel alive, and reckless enough to be lovable.

💵 Price

With cheaper everything, BuniBuni can float around $60 CAD in the pool.

With higher-quality parts, filament, and a proper 5V 4A battery, BuniBuni lands closer to $90 CAD.

“Why so expensive?”

Simple: the battery (since it is beta, I am testing it with only PSU) is high-amp (4A) to support MG90S servos. MG90S costs around $7 each — pricey, but worth it. Why? Metal gears. More torque. More durability.

I chose MG90S because they’re strong enough for hopping. And the 5V 4A battery? Because with great power comes great responsibility (Spider-Man reference). MG90S can draw 500mA to 1A each, so you need serious current to keep BuniBuni bouncing.

"Why not SG90?"

As I said earlier, MG90Ses are more powerful. They are tough. SG90s, however, are weaker, but good for general projects. They use a nylon/plastic gear, and have less durability, stall easier, and are still good for less power projects.