Raspberry Pi

Pi Zero USB hub

Pi Zero USB

I’m far from the first person to put together a Pi Zero USB hub. In fact, mine is loosely based on the open source design from @richardhawtorn, which was based on the design by @MakerBro. The key difference is that I removed one of the USB A ports in exchange […]

Pi with Zero charger

Pi LiPoly charger on Pi day

I considerably reworked the design, and now have one of those boards built up.. I put a P channel MOSFET on the power line going into the MCP73831 LiPoly charger chip, which is the Pi 5 volt line. The power line out, has a Schottky diode, and then goes to […]

Simblee breakout shield

Simblee Breakout Shield – Almost

I got the blank PC boards in for my Simblee breakout board Arduino shield. They look nice, and I started to build one up. Fortunately, I thought to only partially build it up for test purposes. Unfortunately, I didn’t do a continuity test on the board before I started. It’s […]

Launchpad and capacitive touch booster pack

The World’s Geekiest MP3 Player

I’m helping put together  the Wireless Mesh Networked “Hello There!” badges for the upcoming 2016 Boston ESC (Embedded Systems Conference). My biggest contribution is that I got my company, Screaming Circuits, to assemble all of the badges for free, and I got Sunstone Circuits to fab the boards for free. […]

Raspberry Pi Zero

Pi Zero In Hand

I own a decent variety of Raspberry Pi models. I’ve got an old B, a Pi 2, an A+, and my Zero came in the mail today. Unfortunately, I wasn’t able to buy the $5.00 version, but had to buy it in a combo pack from Adafruit. I got the […]

Intel Edison

Welcome Edison

As I wrote earlier, I now have an Arduino 101 to play with.  I’ve also got an Intel Edison, which can run a small Linux distribution and act as an Arduino clone. It’s a lot more serious than the Curie or pretty much any other Arduino I happen to own, […]

Arduino 101

Arduino 101

I just received my brand new Arduino 101 – $30.00 even, plus $4.60 shipping from SparkFun – late last week. So far I’ve only had enough time to install it, and upload “blinky.” The board manager in the more recent version of the Arduino IDE makes installation pretty easy. Much […]

FPGA Beginner’s Series, 12: Driving a 7-Segement Display

It just occurred to me that learning to program FPGAs is making me feel young again. It’s not taking years off my countenance or anything, but I’m once again working with circuits I was building in my high school electronics class back in the age of dinosaurs and dweebs. In […]

FPGA Beginner’s Series, 11: Adding in the Switches

As you may recall, we have progressed beyond the light-emitting diode (LED) flashing tutorial that was provided with the Avnet Spartan-6 LX9 MicroBoard. Now we wish to plug some external switches into our FPGA development board and then use these switches to “Start” and “Stop” the count sequence being displayed […]

An Easy Breadboard Arduino, Part 3

This is part three of my breadboard Arduino-compatible series. Part 1, here, wired up the breadboard Part 2, here, programmed in the bootloader Next, I use an Adafruit FTDI Friend to connect the breadboard to a PC USB port so it’s ready to upload sketches. You can also use an […]