Display Project

[maths22]

I am working on a project using 7-segment displays connected to an Arduino to display data passed from a computer.  Please see the documents below to understand the project and comment with any suggested improvements.

See https://docs.google.com/spreadsheets/d/1lfODdfeFOr7VPZ2BnC4cPchnmfH-MGIJ0UqmtyuHu5I/edit?usp=sharing for parts list.
See http://www.ti.com/lit/ds/scps144b/scps144b.pdf for IC datasheet.
See https://drive.google.com/file/d/0BxnoMRfXXh-FbG92WU9VUHZqd28/view?usp=sharing for schematic of board.

[RobotLady]

Thanks for posting!

I have an idea - have you thought of putting a fuse on the proto board?  It would be a good way to avoid blowing power adapter's and/or circuit breakers.  Just run all of the power through the fuse.

You'll need to understand the maximum current the entire circuit draws, including anything extended from the board on cables.  Then select a fuse with twice the current rating.

Also, it's probably not critical since you said the display changes at 1Hz max, but it is usually customary to put 0.1uF ceramic capacitors very close to each IC connected between power and ground.  Just curious if you considered it or not...

RobotLady