Show and Tell!

Diagno — The Four-Probe Handheld That Measures, Generates, and Sniffs Almost Anything

thegrgelectric — Mon, 10 Aug 2026 23:36:21 GMT

I would like to proudly present my battery-powered, RP2040-based handheld with a color screen and four reconfigurable test probes that measures voltage, resistance, frequency, and logic signals — and can just as easily generate PWM, drive ...(read more)

ESP32+NRF24 based walkie talkie

Nanucek — Sat, 08 Aug 2026 14:31:08 GMT

ESP32 nRF24 Walkie-Talkie (Main Description) This project is a wireless communication terminal built on the ESP32 microcontroller, utilizing the nRF24L01 2.4GHz transceiver module for data transmission. The system features a 0.96" I2C OLED display to...(read more)

Journey of an Autonomous hunter robot and a Stygian Witch Eye

robogary — Sat, 08 Aug 2026 02:11:33 GMT

For interesting STEM demonstrations at schools, I had built a small hobby robot called the Orange Giraffe Hunter. Its job was to look around , lock in, and chase down a plastic Orange Giraffe The prototype build used an Arduino Uno...(read more)

Analog Soul, Digital Heart: A World-War II Emergency Phone

saturn_rings — Wed, 05 Aug 2026 19:51:10 GMT

The inspiration Let's be honest, our grandparents hate smartphones. They find it hard to navigate through menus, forget where the emergency button is, and often want nothing to do with modern technology. On top of that, the world is full of electroni...(read more)

Compact RPi CM4 based Home Assistant System

ralphjy — Tue, 04 Aug 2026 05:03:30 GMT

Introduction I'm currently waiting to receive the hardware for the Raspberry Pi Compute Module 5 Development Kit RoadTest. My motivation for applying for that roadtest is to replace a Home Assistant (HAOS) home automation system that I have...(read more)

PLC with PSoC

Em0ke — Tue, 28 Jul 2026 11:38:43 GMT

This PLC board is designed using a Cypress System-on-Chip (SoC) microcontroller for industrial automation and embedded control applications. The Cypress SoC integrates a microcontroller with programmable analog and digital peripherals on a single chi...(read more)

A.E.G.I.S. Advanced Engineering Gear for Intelligent Support. A Robotic Arm!

AwesomeApple1 — Sat, 25 Jul 2026 00:29:48 GMT

AEGIS is a fully custom-designed robotic arm that I designed, 3D printed, assembled, and programmed from the ground up over the past month. My inspiration came from JARVIS in Iron Man—the idea of building an intelligent robotic assistant that c...(read more)

Station 202: a camera that throws the image away

apn201 — Mon, 29 Jun 2026 20:32:23 GMT

A Raspberry Pi 3 and a broken camera become a generative monitor that renders my desk as green pixels - and never lets a real image leave the device.(read more)

CuteBit Robot

arjunkulkarni — Thu, 25 Jun 2026 18:06:43 GMT

The Expressive AI Desktop Robot CuteBit is an open-source, voice-controlled AI robot that combines a powerful Local LLM "Brain" (running on a host PC) with an expressive ESP32 "Body". Unlike standard voice assistants, CuteBit has ...(read more)