How To Get Involved

There are many ways to contribute to the DorkbotPDX community. Some of us are information junkies, so we have adopted a wealth of ways to share between ourselves and any passersby. Here are a variety of things you can do if you are interested in being a part of this crowd (we are most definitely non-exclusive!):

  • Present on something interesting you're doing/working on/interested in at an upcoming meeting! Let Thomas or Jason know if you have some ideas.
  • Sign up for the mailing lists.
  • Join us on IRC.
  • Sign up on this site and create a member page.
  • Join the DorkbotPDX Flickr group and post pictures you think we should see. The last five of these will appear in the righthand sidebar of the site.
  • Tag your del.icio.us posts with "dorkbotpdx" if you'd like others in the group to see them. You'll notice that these links appear in the low part of the sidebar of the site just like the Flickr pics.
  • Sign up for our Vimeo group and share your Dorkbot videos.
  • Best of all: join us at our bi-weekly meetings.
  • If there's some other way you'd like to get involved or you'd like to make DorkbotPDX aware of something you're working on, feel free to contact us via any of these means.

One final note: please post comments where they are appropriate. If you just have general communication for the group, please post to the mailing list or join the IRC channel.

Comments

Machine Control Research

Greetings! I am a newcomer and absolutely out of my realm. I recently watched a video demonstration of a closed loop control setup of a simple (?) robot platform controlled by a laptop. I realized this could be the most direct approach for a project I've been researching for several months.

I've decided to attempt my version of a film telecine (a way to scan movie film images a frame at a time). The commercially produced machines are many thousands of dollars. thankfully, there are a handful of clever folks out there who have documented their DIY approach, but I'd appreciate your input. If this has previously been discussed on this site I welcome the link. Otherwise, here is the task:

A film projector lamp is replaced with a cool LED, a webcam is attached to the projector lens, and as the film is slowly advanced and stopped, each frame is captured via the webcam. This cycle repeats 5-10 times per second.

Some inventors have used DC motors, others use steppers. Some prefer to have the projector control the action, others prefer to use software control. Please understand I am not a programmer but I could learn the basics to accomplish this. Visual Basic has been suggested. I'm guessing the majority of opinions will be that this would be better served with another os platform. If need be I'll learn that too.

Question 1 Can my PC do the commanding of a project like this or is there a seperate circuit needed?

Question 2 DC or stepper motor for best accuracy? Maybe straight DC for purposes of faster rewind, etc.

Question 3 The standard film projector advances film via the sproket holes along the side of the film. Can you suggest an optical or IR method to detect the image frame, in the event damaged sproket holes would prevent accurate control?

Thanks for your patience with a newbie!

stackup for 4-layer boards

According to a previous post and info from the OSH_Park site, the 4 layer stackup is

top copper foil - 1 oz copper - 1.4 mil thickness prepreg - 7.8 mil inner copper foil - 0.5 oz copper - 0.7 mil FR-4 core - 39 mil inner copper foil - 0.5 oz copper - 0.7 mil prepreg - 7.8 mil bottom copper foil - 1 oz copper - 1.4 mil

This adds up to 58.8 mils, not 63 mils.

Did I get something wrong?

Thanks.

Soldering Help

I am working on an Arduino project and I need to solder a MSOP chip onto a shield that has an SOIC spot. I was expecting there to be a converter of some kine. I do not know how to solder such small surface mount chips. Do you know where I could get this done? This project is time sensitive. Feel free to contact me by email or phone.

Thanks, Chris Baker 503.936.5287

CNC Machine Wiring

   Looking for help testing / troubleshooting a project I've been working on; it's a CNC machine I built from a kit (http://www.mydiycnc.com).  It's assembled and wired, but doesn't respond properly when connected to a PC (via parallel port).  Either I've mis-wired it, or something is defective...

   Help me get this working, and I may be able to make some custom parts for you!  e.g. circuit boards - see video of the same machine in action here: http://www.youtube.com/watch?v=GmqRq4SNpeY

   The circuitry consists of three controller boards (each running to a stepper motor for X/Y/Z axes); nothing too complicated, but I don't have the background to figure out why it's behaving the way it is... 

      - Alan

CNC Wiring

Person Seeking information and help on Crystal radio

Located information and simple way of making you project possible with the materials you have limited your self to.


http://www.youtube.com/watch?v=VqdcU9ULAlA  Shows you how to make a simple real simple tune able Capacitor to improve you system. This I also believe fits in you needed paremeters.


 


And this site by using two diodes will give you a little more power to drive a "Speaker" Don't used a transfomer wind a speaker like was discussed in the meeting using you ohm meter to get the resistance needed ( less loss ) and use a large flat diaphram to create the sound cone http://hibp.ecse.rpi.edu/~john/xtal.html ( concept and instructions to increase power without amp here)


Good Luck