I recently read about Nathan Griffith’s Nematoduino, a full brain simulation (all 302 neurons!) of a nematode on Arduino, with great fascination. I thought it was soooooo cool and immediately wanted one of my own. The source code was released, but unfortunately no hardware diagrams came along with the code. I read through the code and determined that H-bridges were needed — I did not have these on-hand. I did, however, have an Adafruit Motor Shield. I decided to adapt Nematoduino for my hardware and I was successful with very little effort.
It was actually very easy to adapt. The author is setting motor speed using 8 bit resolution, the same as an Adafruit Motor Shield would. I changed his motor commands slightly to signal the motor shield in terms of speed and direction. I made some minor pin selection changes, making pin 13 the indicator pin for the ping sensor. I also disabled the stop/start push-button switch out of convenience but this easily re-enabled.
I was then able to load up my sketch and enjoy my nematode!
I recently built a new home audio system and decided it would be fun to experiment with vinyl given how trendy it has become. I should have known right from the get-go that I would I would wind up going a little too far, in typical audiophile fashion.
I had purchased an Orbit turn-table from U-Turn Audio was quickly having all too much fun. I equipped mine with the acryllic platter and Ortofon 2M Red cartridge. I opted not to get their Pluto pre-amp as my Parasound amp includes a phono stage. This was great for getting started but left something to be desired, as with many built-in phono stages.
After some research, I came upon the Muffsy Hi-Fi Phono Pre-Amp and Power Supply kits. I’m pretty handy with a soldering iron and so this looked like a lot of fun. I purchased the phono pre-amp and power supply and it was shipped in no-time. I already had some OPA2134 op-amps on hand (the upgrade option) so that was helpful.
I recently upgraded my home audio arrangement and wanted to be able to stream content via AirPlay. The seemingly obvious choice was the Apple AirPort Express as it has a TOSlink audio output. I bought one and found myself listening to a symphony of pops and clicks. It was unpleasant and totally unlistenable.
As I had used the AirPort Extreme with some success in the distant past I assumed the issue lie with the Parasound Halo Integrated amplifier (which includes a DAC).
Further research revealed that the Apple AirPort Extreme (current generation) is in fact, a piece of a shit. Its digital output is known to be very jittery and the ESS Sabre 32 DAC in the Parasound is not at all tolerant of this. I was then left with the question of what to do next.
I did some web searches on the topic and uncovered a company called HiFiBerry that makes a number of audiophile-grade products for use with Raspberry Pi. I was already familiar with a Linux distro called MusicBox which is a turn-key AirPlay receiver (among other things).
I set it up (which was a breeze) and suddenly I had TOSlink and 75 ohm coax digital connectivity. I opted for coax. Since then streaming over AirPlay sounds amazing. I play a lot of lossless content and the performance is flawless.
I recommend this to anyone looking for a similar solution. My final solution was to use a Raspberry Pi 3 with the Digi+ Pro and HiFiBerry’s steel case. I am using Ethernet as latency is always better, but I did test WiFi and it worked well for me.
My HiFiBerry setup sitting atop the Parasound Halo.
After building Pi GRRL a few weeks back as a gift, I decided I very much needed one of my own. I just completed it.
I built it very similarly to the other one, using the Adafruit soft tactile buttons for the DPAD and ABXY keys. I decided to used the firmer push-button switches for select/start. I find this cuts down on accidental presses and feels great.
I recently decided that it would be loads of fun to build Adafruit’s totally awesome Raspberry Pi GRRL 2 kit. Ultimately this will be a gift for a family member but I’ll not say anything further on that matter 🙂
My wife was recently away traveling and I decided that I wanted a project to keep me busy and out of trouble in her absence. I determined that I would build her a custom clock while she was gone. I began sketching out my design and found some great parts on Adafruit for my project.
My latest creation came out of a bit of nostalgia. I used to work for NetApp, a major player in the data storage industry. During my time there, I used a FAS3020, purchased on eBay, as a learning tool. I’ve since gotten rid of the filer itself but could not bear to part with the bezel. It was a souvenir of sorts.
I recently uncovered the bezel in my parts closet and realized that a common 16×2 LCD screen fit the bezel perfectly. I have many an Arduino on-hand and I also had a DS1307 I2C-based real-time clock. A short while later, I had it up and going!
The parts used include:
– Arduino Uno microcontroller
– Generic DS1307 I2C Real-time clock (search eBay or Adafruit)
– Adafruit RGB LCD shield kit
I am cleaning-up the code a bit and will then post it on Github.
There is a new petition on WhiteHouse.gov relating to drone’s being shot down all across america. Worse yet, these people are seen as heroes when in-fact they are just reckless vandals. This petition asks the DOJ and the FBI to prosecute such crimes as they should be for shooting down an air-craft which is a federal crime.
Please sign the petition here to protect our drones!
I have long been a fan of Adafruit. They offer some really amazing kits, complete with specs, schematics, examples and all kinds of wonderful code and instructions for the tinkering. I’ve had many hours of fun building and tweaking projects consisting largely of their components.
I have built robots in the past but they had turned out to be more cumbersome than expected. They were heavy and buggy. A lot of this was due to designs that were overkill (a bit too ambitious). Since that time I’ve wanted to build something a bit more lean, simple and fun to operate.