Search found 4 matches

by tbenner_forums
Wed Oct 20, 2010 12:26 pm
Forum: Computer Programming
Topic: USB to serial dongle for Linux
Replies: 2
Views: 1196

USB to serial dongle for Linux

An associate has a laptop running Linux. The computer has 4 USB ports and she needs a serial output. She purchased a dongle at Radio Shack and she doesn't think she needs a device driver. I've been telling her that from my experience with Windows, you need to have a device driver on the computer to ...
by tbenner_forums
Thu Aug 05, 2010 7:38 am
Forum: General Discussion
Topic: Calculating the passband ripple of a filter
Replies: 4
Views: 1219

Re: Calculating the passband ripple of a filter

Let me describe a bit more about the filter. It is a lowpass butterworth filter using a flattest amplitude response, with a cutoff frequency of around 50Hz. We collect force data from load cells on subjects, so want as little noise being introduced by the filter as possible. We use a 16 bit A/D boar...
by tbenner_forums
Wed Aug 04, 2010 6:31 pm
Forum: General Discussion
Topic: Calculating the passband ripple of a filter
Replies: 4
Views: 1219

Calculating the passband ripple of a filter

I've created a hardware lowpass filter using an LM348 op-amp and would like to measure the amount of passband ripple, or noise being generated by my filter, compared to an unfiltered signal. Here is how I am thinking of doing it: > Collect two channels of data, one channel is unfiltered and the othe...
by tbenner_forums
Sun Jun 20, 2010 4:42 pm
Forum: General Discussion
Topic: Using webcams as security cameras
Replies: 7
Views: 2432

Using webcams as security cameras

Hi everyone! I'd like to install some webcams around the windows of my home. Maximum number would probably be around 8. My ideal arrangement would be to have each webcam be able to collect images at a specified interval, and each webcam could save those images into a different folder. The image data...