RFID Door Lock with Battery Backup

Elmue made his own RFID door lock with battery back up.  He was inspired after reading some articles about home burglars.

After searching for an electronic door lock, and not being satisfied by what he found, Elmue decided to build his own.  The design features a powerful battery back up, an easy to use interface, the ability to store up to 64 users, and it mounts inside the door so it’s not visible from outside or exposed to the elements.

There is an excellent, detailed write up on the project that include a schematic, parts list, and code.





MCP Style MIDI Controller Using Homemade Force Sensitive Resistors

Michele Perla put together a DIY USB MIDI Controller.  The MPC (Music Production Controller).

This video shows the controller in action at the Rome MakerFaire.

Mick needed a simple and effective instrument to create drum beats without having to manually write them note by note.  He wanted something more than most of the DIY MIDI controllers out there that use simple on/off buttons.  The answer was to build his own using force sensitive resistors (FSRs).


The controller has 16 buttons using FSRs arranged in a 4×4 matrix.  The FSRs can sense the amount of pressure applied to a button and use that information for things such as a velocity of a note, control change value, etc.

There is a pretty good write up on his HackADay.IO project page that includes schematics of the project.

Home Heating Monitor

Dave built a home heating monitor to collect data on the duty cycle of all the heating zones in his house in hopes better understanding the activity  off all the zones in order to reduce oil usage and save a few bucks.







The first version of the project didn’t pan out so well.  The controller used didn’t work out so well.  In version 2 of the project Dave used Teensys to take data measurements and send the data another controller.

Dave found that storing the data on a webserver is easier than storing it in an embedded device, and displaying the data in HTML on a web page is more flexible that doing it in a Windows app.