Projects Alvaro Barcellos likes and follows

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A Decentralized Communication Device for Emergency Situations

CyberMesh LoRaChat

An open-source, fully 3D-printable rover platform featuring NASA-style Rocker-Bogie suspension, powered by ESP32

Papaya Pathfinder: Open Source ESP32 Rover

sergio-garca-snchez Sergio García Sánchez

Can you generate enough energy to power a transmitter with a piezo disk?

The Piezo Transmitter

bkainka b.kainka

This project re-purposes a cable as a voltage boosting device

Boosting voltage with a cable

"Abusing" low cost Analog Switches for Digital Logic.

Analog Multiplexer Logic

Using 5 BJT (BC547) I built a small, cheap and easy class C QRP pre amplifier for HF bands. Adding two MOSFETs you can get about 10W

1-30 MHz 0.5-1W (or up to 10W) class C amplifier

guido-iw5alz Guido - IW5ALZ

A coffee table that draws pretty patterns in sand using a corexy mechanism to move a magnet

Arrakis 3.0 Coffee (Sand) Table

mark-rehorst Mark Rehorst

Yet another VGA Controller built around an 8‑bit PIC18F47K42

Serial VGA Controller

Use your microcontroller internal IO pull-ups as base resistors and use input-only pins as outputs

Pull-up hacking

scart-vader SCART VADER

Using standard 4000 series ICs to build ternary circuits

Ternary abuse of CMOS logic

Yet another project trying to generate VGA signals using small avr mcu.

VGA with Arduino

An electronic candle that switches off when you blow on it. No moving parts, no microcontroller; just old-style analog circuitry.

Blow Out an Electronic Candle - The Analog Way

andrea-console Andrea Console

Wall-following robot that detects CO + LPG in real time, streams live video via ESP-CAM, and serves its own web dashboard — built in 24 hour

Autonomous Gas Leak Detection Robot — ESP32 + Live

Open-source ESP32 pen plotter: FluidNC reads G-code from microSD, NEMA17 XY + SG90 pen servo. Files made in Inkscape → vpype → custom app.

DIY pen plotter ESP32

Designing yet another 8-bit TTL computer. A successor to the DIP-8

Ivy64

Data transmission using an LED as a photodiode

Better Than Bluetooth

Surprisingly good 1 bit PCM audio at an absurdly low samplerate. 1 Bit audio not at millions, but as little as 15,926 samples a second!

Abusing a 6522 VIA serial port for PCM Audio

normall-user NormalL User

A DIY balcony ground station for radio science. Custom-built hardware for tracking satellites and deep-space RF experimentation.

Balcony Radio Science

This circuit is not new but is rarely used or talked about. So here is a linear VR using BJTs only

BJT AS A ZENER

taurai-mirimi Taurai Mirimi

* No magic here. But I show that LEDs light up from tiny currents induced by electric fields around us, with no further electronics needed.

LEDs light up without power or electronics!*

joekutz joekutz

This project simulates a double pendulum, a simple system with complex dynamics and high sensitivity to initial conditions.

Interactive Double Pendulum Playground

abhishek-choudhary Abhishek Choudhary