An Arduino course from Udemy

While I feel like I have managed to become reasonably knowledgeable about programming Arduinos, and experiences such as at Startup Weekend and with Code for DC have validated my knowledge base and skill, I know there is a tremendous amount that I still have yet to learn.  Moreover, I feel like I have learned sporadically,…

Getting started with the ESP8266

So I purchased a few $5 (or less) Wifi chips off of ebay, the ESP8266.  It has taken the maker world a little by storm, as it makes is super cheap to get wifi into a project. You can use it as a standalone microprocessor, but to start I wanted just to use it as…

Prototyping with Dan Gelbart

Stumbled across a great intro to prototyping thanks to an article at Makezine, about billionaire Dan Gelbart.  He has a cool set of tools in his basement, and has great instructions for how to build stuff. Check out the YouTube intro and the YouTube Channel. Lessons I liked a lot were on forming plastic molds, and on building…

Bag Movement Alarm: project complete

After I completed the prototype of the bag movement alarm I spent some time turning it into something that is more of a usable product.  I designed a layout to fit onto a protoboard PCB that I got with a small project case I purchased, and then soldered it up and stuck it in the project…

Prototype complete: bag movement alarm

After figuring out the modified power circuit and the battery power monitor circuit, I could finally finish the prototype of the bag movement alarm.  I also added the same power switch circuit for the speaker, which allowed me to use a much better speaker (when I had tried it before with the old power circuit, it beeped…

Power monitor circuit

For the bag movement alarm project, I wanted to be able to monitor the battery level so I can warn the user when they need to change the battery.  A simple way to do this is just to monitor the voltage of the battery, as batteries have a pretty well articulate discharge curve:  with more…

Power circuit redesigned!

When I integrated the TrinketPro into the bag movement alarm prototype project, the power circuit did not work.  So I needed to redesign the power circuit. I had posted a question about this in the Arduino.cc forum, where forum user dlloyd had helpfully pointed me to an excellent explanation of using MOSFETs as power switches.…