Replies to This Discussion

Permalink Reply by wayne garris on December 27, 2007 at 9:43pm

tell me more about the set up please , whats its intended purpouse?

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Permalink Reply by James Hall on December 28, 2007 at 3:35am

Thank you for the helpful tip. The setup is only in its basic form at this point. But my intention is to develop an autopilot with data logging capabilites using a 3-axis accelerometer, a data logger from Parallax with a thumb drive, a temperature sensor (for fun), and a GPS. I am replacing the Basic stamp 2 with a basic stamp 2p for more speed and program capacity.

The fun part begins when I start integrating the system into my helicopter to control cyclic and collective with tail rotor control. Throttle control may come later.

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3D RoboticsPermalink Reply by Chris Anderson on December 30, 2007 at 11:57am

Either of you guys have success with the Parallax GPS board? I'm having a devil of a time getting it to keep sats and I'm getting garbage data out with the Parallax GPS demo code. Do I have a bum board, or is this something you've seen too?

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Permalink Reply by James Hall on December 30, 2007 at 1:30pm

I haven't got to the GPS yet, does it have a way to plug in a external antenna? Is it getting enough voltage?


I just picked up a 2-axis mesmic accel today....working with it now.

3D RoboticsPermalink Reply by Chris Anderson on December 30, 2007 at 6:13pm

Found the problem. Turns out that you can't put the GPS board on the dev board's breadboard because interference messes up its reception (instead, you can connect it with a long female-to-female servo cable to a servo port on the board). Also, you've got to change this line in the code--T4800 CON 188-- for whichever Basic Stamp you've got. For our BS2p, the 188 should be 500. For the BS2px it should be 813. Who knew?!?

3D RoboticsPermalink Reply by Chris Anderson on December 29, 2007 at 1:11pm

You guys are way past this step, but I was reminded by your discussion to start a tutorial on setting up the hardware for this autopilot. The first post on that series is here.

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Permalink Reply by James Hall on December 29, 2007 at 2:00pm

Here are the promised hardware shots. I hope they help. Chris, please feel free to include these shots on your hardware series if you like.

Jim

Attachments:

• P1010084.JPG, 115 KB
• P1010091.JPG, 177 KB
• P1010095.JPG, 92 KB

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Permalink Reply by James Hall on December 30, 2007 at 1:59pm

The following attached is not for the GPS, but its a modification of the code demo from Parallax for the MESMIC 2-axis accellerometer. The code nulls out the effect of gravity in order to give you relative angle on the x and y axis.

Attachments:

• MEMSIC2125-Dual.BS2, 5 KB

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Permalink Reply by James Hall on December 30, 2007 at 5:17pm

Does anyone know how to use PUT and GET with the bs2p and share data among each program slot?

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3D RoboticsPermalink Reply by Chris Anderson on December 30, 2007 at 6:29pm

Yes, that's what we do in the "Initialize" program in the Basic Stamp autopilot. It's very straightforward, but you can't use any data in scratch RAM until you copy it into a variable with GET.

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Permalink Reply by James Hall on December 30, 2007 at 9:57pm

I still cannot get this to work and my programs do not seem to be switching back to slot 0 from slot 1 even if this is the only command I have in the slot 1 program. This is very odd.

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3D RoboticsPermalink Reply by Chris Anderson on December 30, 2007 at 10:07pm

Just so I'm clear, is the problem that you're not getting programs to switch back and forth from slot to slot, or that you're having trouble sharing data from scratch RAM between programs?

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