WizPad

A custom 4x3 macropad (12 keys) with a rotary encoder and RGB backlighting, powered by the Seeed XIAO RP2040 microcontroller. Features: - 4x3 mechanical key matrix (Cherry MX compatible) - Rotary encoder with push button for volume/scrolling - 8x SK6812 NeoPixel RGB LEDs for backlighting - Seeed XIAO RP2040 microcontroller - KMK firmware (CircuitPython-based) - Custom laser-cut acrylic case (sandwich mount) I designed this in a 5-hour speedrun session, starting from zero PCB experience. Ran full DRC validation with zero errors. The PCB is under 100mm x 100mm and ready for manufacturing. GitHub PR: https://github.com/hackclub/hackpad/pull/726

EchoNet

Acoustic data transmission system using AFSK modulation. Transmits data via sound waves (10-14kHz), with Hamming FEC error correction. Turns any device with a speaker/mic into a wireless modem. Future upgrade: Ultrasonic transmission (20-40kHz) using piezo tweeters and amplifiers for silent communication. Current 10-14kHz is audible - ultrasonic will be completely silent and better for ear safety.

ESP32 Medical Swarm Health Bots

Build a 3-robot swarm of ESP32-based autonomous bots for hospital environments. Each bot can deliver medical supplies, avoid obstacles using ultrasonic sensors, and coordinate wirelessly via ESP-NOW. Includes 500g payload capacity, basic environmental monitoring, and web dashboard for task management. Inspired by academic research in autonomous healthcare robotics.