LED Message Badge

I made a custom message LED badge made in response to the Star Simpson controversy. Star was a student in our group and got a very unfair treatment by the […]

I made a custom message LED badge made in response to the Star Simpson controversy. Star was a student in our group and got a very unfair treatment by the authorities, the media and MIT when she accidentally wore an electronic badge in the Logan airport.

Shows both sides of the EaglePCB board layout

Shows both sides of the EaglePCB board layout

I made an array of 36 orange LEDs, found an AVR that had four I/O ports (ATmega32) and and used a 3:8 mux. The mux was necessary because 4×8=32 but I needed 36 pins to control all the LEDs.

To reduce the size of the board, I used the same current resistor for all LEDs, to make sure that the power rating for the resistor wasn’t exceeded only one LED is on at any given time.


I also milled two circuit boards using the mini mill and attached them using standard 0.1m headers. This effectively gave me a 2-layer board.

The badge can spell out any message, in the attached video it spells out “socket to me” because that was the message Star Simpson used, I have also had it spell out “fab class” amongst other things.

(more)

About Siggi