Jordan Perr

A necessary but mundane task of programming any vehicle’s autonomous drive system is filtering the noise out of encoder and accelerometer sensory data. To demonstrate the noisiness of our sensors to the rest of the FRC team, I decided to create visual aids using Microsoft Excel. The following graph shows both sets of data over time during smooth acceleration and deceleration.

Accelerometer and encoder data on progbot for a "smooth" driving trial.

Accelerometer and encoder data for a very rough trial with progbot. The wheels were slipping at points during this trial.

After an entire christmas vacation’s worth of PHP and Javascript wrangling, Daryl and I finished the 2008 Stuypulse website!

Click to visit stuypulse.com

The new site contains a novel CMS developed from scratch. Using a seamless interface, team members can add and edit pages and subpages to an infinite depth, create and display custom “widgets” for both sidebars, and easily update header and footer information. Integration with our existing SMF forum login system means that team members can use their forum credentials to log into the CMS.

Harvey Citron wanted a Flashy new site to show off his amazing custom guitars and basses. Keeping with the “film strip” design of his previous site, I created a general swf file that loads images dynamically from a MYSQL database. This is the first dynamic Flash app I have ever made.

I wrote a nifty little administrative interface that allows Harvey to add instruments, delete them, and modify them. He can also change any other static looking page on the site. No framework was used, just raw PHP.

I have been maintaining my mother’s freelance web presence since 2002. The current iteration of her site(s) feature some statically loaded flash content and simple JavaScript rollovers.

• janetperr.com
• yiddishfordogs.com
• hiphopfordogs.com
• yiddishforbabies.com

Pointdrive is a revolutionary control system developed by me and a small team of programmers for Stuyvesant FRC’s 2007-2008 season. The system includes a bezier curve interpreter (written in C) onboard the robot’s IFI PIC18 RC unit as well as an AdobeSVG file converter on the host PC. This novel system allows drivers to literally draw the desired autonomous drive routine atop a map of the competition field, greatly reducing pre-match glitches and debugging.

• The code for Pointdrive is located somewhere in this subversion repository.
• The Adobe SVG parsing script is located here.

I finally decided to take the plunge into the not-so wild world of blogging! It was very hard to part ways with my old site, but I think that the move will give me more flexibility and encourage me to update my site more often. Here’s to changing times!