Search found 38 matches

by evarobotics
Tue Oct 05, 2010 6:34 pm
Forum: New Product Ideas
Topic: Designing the Ultimate IMU
Replies: 37
Views: 13768

Re: Designing the Ultimate IMU

Thanks for the links - I have also forwarded these onto a mate doing some UAV work. There are now countless IMU and AHRS products available for <$200. I wonder if SparkFun are losing the enthusiasm to get involved in this increasingly crowded Market (I hope not). I'm afraid we are coming to the same...
by evarobotics
Wed Sep 29, 2010 8:20 pm
Forum: SparkFun Product Questions
Topic: Compliance testing?
Replies: 4
Views: 952

Re: Compliance testing?

CE is necessary for Europe. C-Tick for Australia. But the states is very complicated, with the actual "law" depending on individual states as well as federal requirements. We CE mark all our products and that has always let us ship into the US without UL - to universities and labs. Even medical devi...
by evarobotics
Sun Sep 05, 2010 10:00 pm
Forum: SparkFun Product Questions
Topic: Stepper motor finding hard stops
Replies: 2
Views: 865

Re: Stepper motor finding hard stops

Another method is to use a course encoder - it doesn't need to be anything flash, but it should be at least the same resolution as the motor (i.e. 200 pulses for a 1.8 deg stepper) Drive the motor toward a hard stop (limiting the current is a good idea if you can) and watch the encoder. When the mot...
by evarobotics
Wed Jun 30, 2010 9:17 am
Forum: New Product Ideas
Topic: Designing the Ultimate IMU
Replies: 37
Views: 13768

Re: Designing the Ultimate IMU

I'm sure the price will be right... but if it is sufficiently sexy then it sounds like something we are better off distributing rather than making our own! No point reinventing the wheel. Have you thought about mounting the IC's onto a flexible PCB and then packaging the lot into an anodised cube to...
by evarobotics
Tue Jun 29, 2010 12:53 am
Forum: New Product Ideas
Topic: Designing the Ultimate IMU
Replies: 37
Views: 13768

Re: Designing the Ultimate IMU

Oh, oh! also, put lasers on it. Lasers are great.
Yes... Yes they are.
by evarobotics
Tue Jun 15, 2010 7:23 am
Forum: New Product Ideas
Topic: Designing the Ultimate IMU
Replies: 37
Views: 13768

Re: Designing the Ultimate IMU

Hi sebmadgwick, Nice work on your IMU tag. I browsed your videos and got lost in the British grand challenge project you were involved in... Bastard! ;) I'm keen to learn more about the data fusion algorithm you used. Do you have a paper I could see? I have also started a forum on my own site to cap...
by evarobotics
Mon Jun 07, 2010 3:29 am
Forum: SparkFun Product Questions
Topic: shield to Gnd?
Replies: 5
Views: 7273

Re: shield to Gnd?

Be careful! This has burnt a lot of people - including me! Another engineer and I just spent a week tracking down an intermittent EMI issue with a new USB interface. The recommendation from FTDI and the USB Spec says that, at the device end, the USB shield should not be connected to the signal groun...
by evarobotics
Thu Jun 03, 2010 3:26 am
Forum: SparkFun Product Questions
Topic: Tracking a ball
Replies: 4
Views: 586

Re: Tracking a ball

Another idea while we're here...

I've heard of active RFID being used to track people in buildings. You have three or more RFID readers which read the signal strength of an active RFID tag in the ball. I'd expect this to be less accurate than vision systems though.
by evarobotics
Thu Jun 03, 2010 3:24 am
Forum: SparkFun Product Questions
Topic: Tracking a ball
Replies: 4
Views: 586

Re: Tracking a ball

There's nothing new about object tracking with cameras. There's certainly a lot of literature on the subject and hardware has never been better. And processing is not as difficult as people think - there are embedded platforms that pull off extremely high speed image analysis. The hardest part about...
by evarobotics
Thu Jun 03, 2010 3:15 am
Forum: SparkFun Product Questions
Topic: Tool/utility for PCB BOM/MRP planning?
Replies: 7
Views: 1195

Re: Tool/utility for PCB BOM/MRP planning?

Hi David,

I wasn't commenting on your efforts. In fact it sounds like you are working on a PLM/MRP system that clearly has a strong market.

Good luck with it. I'd be interested in having a look once you've polished things up.

Cheers
by evarobotics
Wed Jun 02, 2010 10:31 pm
Forum: SparkFun Product Questions
Topic: Tool/utility for PCB BOM/MRP planning?
Replies: 7
Views: 1195

Re: Tool/utility for PCB BOM/MRP planning?

Mmmmm... I haven't come across anything like that which is not linked to some other function. For example I know of online BOM management tools but they are for managing quotes and orders from manufacturers, not for your own inventory management. MYOB/Quickbooks can manage BOM's and builds but obvio...
by evarobotics
Wed Jun 02, 2010 9:48 pm
Forum: SparkFun Product Questions
Topic: Tool/utility for PCB BOM/MRP planning?
Replies: 7
Views: 1195

Re: Tool/utility for PCB BOM/MRP planning?

We've been looking at this as well and have come across a number of good small to medium size PLM/MRP type packages. But we are looking to pay for it.

What are you looking for in terms of budget / feature set? In other words... why aren't you using excel or some database tool?
by evarobotics
Wed Jun 02, 2010 9:40 pm
Forum: SparkFun Product Questions
Topic: Tracking a ball
Replies: 4
Views: 586

Re: Tracking a ball

I'm sure you have thought about this - but the obvious answer is cameras. Same as Hawkeye in tennis.

Not a squash player myself but I believe you have good contrast between the ball and the color of the court. And the courts have colored walls which helps.

Do you want to track in 2D or 3D?
by evarobotics
Sun May 30, 2010 4:55 am
Forum: Everything ARM and LPC
Topic: LPC1768/J-Link/CrossWorks Weirdness
Replies: 6
Views: 2549

Re: LPC1768/J-Link/CrossWorks Weirdness

I've used crossworks extensively with ARM on Atmels and Luminary chips - but never for more than a few hours at a time. On the Atmel SAM7's they only had 2 hardware breakpoints (from memory :? ) and I remember crossworks always had trouble managing them. It would show breakpoints in the debugger but...
by evarobotics
Sun May 30, 2010 4:50 am
Forum: PCB Design Questions
Topic: Flexible PCB Blanks for home construction
Replies: 15
Views: 7568

Re: Flexible PCB Blanks for home construction

If you don't want to do anything too fine, then membrane keypad manufacturers might be a cheap alternative. - They usually don't get precious about MOQ or tooling. Many are happy to laser cut small quantities. - They have heaps of great substrates - different stiffnesses, chemical resistance etc. - ...