Presenting at the Denver iOS Developer User Group in June 2014
I had the chance to attend WWDC 2014 in San Francisco...
Jumping on an opportunity to give a talk, I had the chance to speak to the Women Who Code Meetup in Boulder and Denver. It was an intro to iOS programming talk. I did a simple app in Objective-C with a storyboard and one button to demonstrate a simple segue between scenes and a few lines of code. People were very engaged, particularly in Boulder.
In this article, I present installing a Scala and Scalatra stack on a Raspberry Pi Model B.
For this project, I generate arbitrary waveforms by creating a PWM signal from a generator (in this case, the ATMega328), run it through a low pass filter, and have the waveform as the result.
For more see the main page on the project, see the
On August 23, 2013, I presented my Bluetooth 4.0 Low Evergy interface to the Boulder iOS Developer meetup. I presented my bluetooth low energy device All the way from circuits to the iOS application. Going from Hardare to software hadn't been done before in the meetup, so that was pretty cool.
This app lets you touch the Ideal Gas Law. Molecules bounce off each other as they do in a real gas (like the air). Watch the pressure change as you squish and expand a container (Volume Tab) or as you virtually heat or cool the gas (Temperature Tab). And, if you want to read about the basics of the Ideal Gas Law and what it means, just click on the Overview Tab.
To enclose my latest Morse Code CW Keyer project in a quick and simple enclosure that is better than the breadboard and stack of three shields as described in the original article
and finally into this:
I needed a way to enclose my electronics projects that was easy and cheap to build. In Making Things Talk by Tom Igoe, he mentioned using plastic kitchen containers as project enclosures. So I decided to give it a try.
The circuit came from Timer, Op-Amp & OptoElectronic Circuits & Projects by Forrest M Mims III. Page 79. I don't reproduce the schematic here for copyright reasons...however, I recommend this book highly! It is a great lesson on how we did things before pervasive and cheap Arduinos ;)
Before & After
transofrmed the breadboard on the left into the kitchen container enclosure on the right.
Parts List for the Enclosure and PCB
Kroger mini deep dish container, 9.5 fl. oz. (280 mL)
4 threaded 6-32 1/2" standoffs
8 6-32 1/4" screws
Parts List for the Circuit
2 9V battery clips
100 kilohm potentiometer
4 0.01 microfarad capacitors
1 kilohm resistor
1 10 kilohm resistor
2 27 kilohm resistors
I used a little cordless screwdriver/drill from Ikea to drill in the plastic. The plastic was slippery, so I tapped the holes with a little nail before drilling. Also I drilled both sides of the lid.
Quick and easy: it was successful and I have already used it for another project. More to follow on that in a later post.