xfrings created this 3.3V to 5V level converter to drive a RGB LED Matrix from a Raspberry Pi:

RGBMatrixHat

The design files and source code are available on GitHub:

RGB-MatrixDriver

The RGB LED Matrices are large scale panels which are the ones which are used on video walls (for example in Times Square or on the faces of skyscrapers). Essentially these are ordered rows of RGB LEDs with no driving logic or controllers on them what-so-ever. All driving and control logic needs to be implemented externally.

Source: https://www.github.com/xfrings/RGB-MatrixDriver

Source: https://www.github.com/xfrings/RGB-MatrixDriver

Source: https://www.github.com/xfrings/RGB-MatrixDriver

regendrogenbogen created this breakout board for the MCP2200 USB to UART bridge from Microchip:

USBanana UART

I made this board because the FTDI chip is quite expensive and the MCP2200 can be acquired for a significantly lower price or even as a sample.

ripper has shared the board on OSH Park:

https://youtube.com/watch?v=MMy_GhyobDQ%3Fversion%3D3%26rel%3D1%26fs%3D1%26autohide%3D2%26showsearch%3D0%26showinfo%3D1%26iv_load_policy%3D1%26wmode%3Dtransparent

Inventing New Logic Families — Hackaday

One of the favorite pastimes of electronics hobbyists is clock making. Clocks are a simple enough concept with a well-defined goal, but it’s the implementation that matters. If you want to build a clock powered only by tubes and mains voltage, that’s a great skill tester. A relay-based timepiece is equally cool, and everyone should…

Diode-Diode Logic Demo / 1-Bit Memory

https://youtube.com/watch?v=Vks5K6tFxGQ%3Fversion%3D3%26rel%3D1%26fs%3D1%26autohide%3D2%26showsearch%3D0%26showinfo%3D1%26iv_load_policy%3D1%26wmode%3Dtransparent

tl:dr The one bug bare about running a ‘headless’ raspberry pi is shutting it down when something goes wrong. I started looking into what other people had done, I quite liked the look of the turnoffeepi but hated how it covered valuable I2C pins. This is why I decided to design my own shutdown button. […]

via Shut it down (Raspberry pi that is) — Facelesstech

https://youtube.com/watch?v=py17ZlEoVJs%3Fversion%3D3%26rel%3D1%26fs%3D1%26autohide%3D2%26showsearch%3D0%26showinfo%3D1%26iv_load_policy%3D1%26wmode%3Dtransparent

tl;dr As of writing this the raspberry pi zero is still hard to get hold of, Since I managed to snag one I thought I would put it some use. Also Hackaday/Adafruit gave me a kick up the arse with there Contest too. I haven’t really done anything with raspberry pi GPIO before now. I had […]

via Rpi_status (The raspberry pi has got his hat on, Sort of) — Facelesstech

[Tisham Dhar] has been interested in monitoring AC power and previously built a breakout board for the ADE7763. He wanted to find something cheaper and more modern. The ATM90E26 fit the bill. It can communicate via a UART or SPI, and has multiple metering modes. The problem? The evaluation module from Atmel costs about $500…

via Smart AC Monitoring: Without the $500 Price Tag — Hackaday

https://youtube.com/watch?v=ZS0ze9Yxc_s%3Fversion%3D3%26rel%3D1%26fs%3D1%26autohide%3D2%26showsearch%3D0%26showinfo%3D1%26iv_load_policy%3D1%26wmode%3Dtransparent

It’s been a while since we’ve seen much action on the bristlebot front, which is too bad. So we’re happy to see [Extreme Electronics]’s take on the classic introductory “robot”: the Black Line Follower. The beauty of these things is their simplicity, so we’ll just point you to his build instructions and leave the rest…

via Black Line Follower: A Modern Bristlebot — Hackaday

Alex Hiam created a sensor box with the LPC824 microcontroller:

BICORDER

I put this project together for the OSH Park Bring A Hack meetup at the 2016 Bay Area Maker Faire. It’s Tricorder inspired, but can’t quite sense everything, so the name “Bicorder” seemed fitting.

• 3-axis magnetometer
• relative humidity / temperature sensor
• infrared range finder
• 128×32 pixel monochrome LCD
  • live plot of temperature (in Celsius)
  • live plot of relative humidity
  • live plot of magnetic field (Z-axis) in uTesla
  • compass display (using the mag X and Y)
  • distance readout in cm

The source code is on GitHub:

graycatlabs/Bicorder

Alex leveraged his ARM microcontoller board: