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 You know you are addicted to FIRST when you have trouble describing it because you realize it truly is way more than just a robotics competetion. - vivek16 [more] |
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A first layout of the controller for our summer project. I've been saying it's easy to build a Segway for years and the team finally called my bluff, so we're gonna do it. The controller will handle two PWM outputs (left and right motors), plus a few analog and digital channels. It is wirelessly programmable and debug-able. (In theory it could operate under remote control but I don't know how good of an idea that is for a Segway.) And the strange-looking connector on the bottom right is for an ADIS16350 inertial sensor that I just happened to come across...
P.S. MechE's shouldn't do PCB design: If any of the EE-types here spot something glaringly wrong with the design, please let me know!
Discussion
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27-05-2007 21:29
tseres
Re: pic: What are we up to this summer...
good luck! also you could probably use a gyro mounted to measure the z-axis to keep it stable. may i also suggesy building a Legway (lego segway - google it, theres a few links) to prototype to make sure you have a lot of the bugs worked out before you build it full-scale. theres nothing worse than making something to have it not work....
27-05-2007 22:54
bear24rw
Re: pic: What are we up to this summer...
That sounds like a pretty sweet project, keep us posted on how it goes
28-05-2007 00:56
Adam Shapiro
Re: pic: What are we up to this summer...
Are you using a ground plane with this board? There is no trace for gnd visible. If so, make sure you select the correct options when you send it to be made. Also, you may want to trim the board down and reduce some of that text, boards get pretty expensive pretty fast as they get bigger.
28-05-2007 09:12
ZZII 527
Re: pic: What are we up to this summer...
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Originally Posted by Adam Shapiro
Are you using a ground plane with this board? There is no trace for gnd visible. If so, make sure you select the correct options when you send it to be made. Also, you may want to trim the board down and reduce some of that text, boards get pretty expensive pretty fast as they get bigger.
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As for the cost, www.33each.com is my new favorite fab place. $33 boards up to 60 in^2 with no minimum quantity for students. Plus, they send you free popcorn and a Domino's coupon.
Anyone know if the Schottky diode in series (D1) approach is okay for reverse polarity protection for something like this? I'm looking to protect the sensor - the PIC and radio are relatively expendable. Are there any other good methods of making sure the sensor (bottom right connectors) doesn't get toasted?
11-06-2007 20:34
ZZII 527
Re: pic: What are we up to this summer...
Works like a charm. Um, not the Segway part yet, just the PCB. I can grab the 3-axis gyro and accel measurements off the sensor at about 300 samples per second and drive two PWMs, plus communicate everything to a PC wirelessly.
Hooking up the $275 sensor for the first time was scary. No matter how many times you check the pin diagram, it's still an adventure.
19-07-2008 15:29
laurita
Re: pic: What are we up to this summer...
Dear Sirs:
My name is Laura Andrea Gonzalez, I am student of engineering.
I am working with the ADIS16350 inertial sensor and a dsPIC microcontroller programmed in MPLAB C-30.
Please, can anybody help me with some C code example algorihm about how can I to build the SPI sensor data aquisition?
Thanks in davance.
Laura
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