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Re: Any AVC 2011 Build Logs?

 by shimniok ¦  Wed Mar 30, 2011 12:05 am ¦  Forum: Sparkfun Promotions and Competitions ¦  Topic: Any AVC 2011 Build Logs? ¦  Replies: 34 ¦  Views: 11844

I think at 90 seconds the average speed would be about 6.5 mph Shimniok, It looks like from your video you will have no trouble beating that speed. True... my robot will be a little faster than that... in the wrong direction :D Also, crashing into things lowers the robot's average speed somewhat......

Re: Any AVC 2011 Build Logs?

 by shimniok ¦  Tue Mar 22, 2011 9:55 pm ¦  Forum: Sparkfun Promotions and Competitions ¦  Topic: Any AVC 2011 Build Logs? ¦  Replies: 34 ¦  Views: 11844

Nice job you guys!

90 seconds. Wow!

And... I'm wearing a helmet when the 'copters take off :D That vid was awesome!

Here's a video of my robot's maiden voyage testing...

...showing just how far I still have to go :)

Re: QuadCopter question re: need for Power Distribution Board

 by shimniok ¦  Thu Mar 10, 2011 11:00 pm ¦  Forum: Arduino ¦  Topic: QuadCopter question re: need for Power Distribution Board ¦  Replies: 14 ¦  Views: 4762

Yeah I see the link to buy the PDB is broken. Looks like someone posted in the comments and got a response w/ link:

The PCB files are available... you could always fab your own if it's not too hairy of a layout.


Re: Any AVC 2011 Build Logs?

 by shimniok ¦  Mon Feb 28, 2011 10:30 pm ¦  Forum: Sparkfun Promotions and Competitions ¦  Topic: Any AVC 2011 Build Logs? ¦  Replies: 34 ¦  Views: 11844

I'm really curious about the UAV thing. Been thinking I will first convert a cheap foam glider to RC, then turn it into a UAV ... some day... maybe for next year. Anyway... I've got the compass on, calibrated, seems to work ok. Having tons of trouble getting the mbed to log data to the sd card relia...

Re: Create a negative voltage

 by shimniok ¦  Mon Feb 28, 2011 10:23 pm ¦  Forum: Arduino ¦  Topic: Create a negative voltage ¦  Replies: 12 ¦  Views: 13557

Never actually built anything like this... But I've looked it up out of curiosity. Google charge pump negative voltage. Also there are various dc-dc converter ICs out there that can create negative voltage from + supply. Maybe use octopart to find some.

Re: Wireless sensor array - please review my schematic!

 by shimniok ¦  Mon Feb 28, 2011 12:38 am ¦  Forum: SparkFun Product Questions ¦  Topic: Wireless sensor array - please review my schematic! ¦  Replies: 12 ¦  Views: 2024

Nothing's jumping out at me...

I would think you can use multiple resistors as you want in parallel for I2C. Only caveat is that of course current draw is going to increase the more devices you have.

Re: Finished project: Backyard Rocketship Treehouse (it works!)

 by shimniok ¦  Mon Feb 28, 2011 12:29 am ¦  Forum: SparkFun Product Questions ¦  Topic: Finished project: Backyard Rocketship Treehouse (it works!) ¦  Replies: 1 ¦  Views: 361

That is *so* **cool** ... I would've died and gone to heaven if that'd appeared up in my backyard... sci-fi-geek kid that I was... jungle gyms were spaceships to me and my pals.

Re: Hooking LS20031 to PC with the FTDI Basic.

 by shimniok ¦  Mon Feb 28, 2011 12:23 am ¦  Forum: SparkFun Product Questions ¦  Topic: Hooking LS20031 to PC with the FTDI Basic. ¦  Replies: 1 ¦  Views: 390

3.3V power, right? Make sure TX and RX on each side are hooked up right. You might try swapping them and see what happens. In RS232 world, there are data communications equipment (DCE, like a modem) and data terminal equipment (DTE, like a PC, Arduino). How RX and TX pins are labeled depends on whet...

Re: Custom Shapes

 by shimniok ¦  Mon Feb 28, 2011 12:15 am ¦  Forum: PCB Design Questions ¦  Topic: Custom Shapes ¦  Replies: 3 ¦  Views: 1145

Just draw a circle (or whatever other) object on the Dimension layer and use that as your guide for laying out components, and delete the original rectangle? I started to play with this recently but haven't seen it through to the end. Was having some yet unexplained issues placing components. I'm as...

Re: LS20031 output issues?

 by shimniok ¦  Mon Feb 28, 2011 12:07 am ¦  Forum: GPS ¦  Topic: LS20031 output issues? ¦  Replies: 7 ¦  Views: 1782

You can't send commands to set baud rate unless you know the baud rate it's set to. The GPS will receive gibberish if, for example, it's expecting 9600 and gets a command string at 57600. Is your ground hooked up correctly? Maybe recheck wiring and pinout too. I don't suppose you have an oscilloscop...

Re: Using Arduino board to relay infothrough CB transmission

 by shimniok ¦  Sun Feb 27, 2011 11:37 pm ¦  Forum: Arduino ¦  Topic: Using Arduino board to relay infothrough CB transmission ¦  Replies: 4 ¦  Views: 1559

Plus there's that minor detail that it violates FCC rules, but who am I to be a stickler for such things. :)

Re: Sanity Check

 by shimniok ¦  Sun Feb 27, 2011 6:10 pm ¦  Forum: Arduino ¦  Topic: Sanity Check ¦  Replies: 7 ¦  Views: 1081

LEDs have a maximum current rating, usually around 20-30mA for the common ones (of course there are exceptions). So you want to keep the current at or below that max rating. Usually the 'cheater' way to run an LED is to take advantage of the (usually) 2V voltage drop across the LED (potential energy...

Re: How to arduino import var values from text files

 by shimniok ¦  Sun Feb 27, 2011 5:57 pm ¦  Forum: Arduino ¦  Topic: How to arduino import var values from text files ¦  Replies: 2 ¦  Views: 1954

FWIW, parsing isn't all that tough, even without using fscanf(). It helps if you get to decide the file format. If so, then keep it really simple, with single character tokens. E.g., var1 = 13; var2 = 128; is harder to parse than: # var1, var2 13, 128 or 13 128 You have atoi() that you can use for i...

Re: Need your advice - Breadboard Arduino Newbie

 by shimniok ¦  Sun Feb 27, 2011 5:48 pm ¦  Forum: Arduino ¦  Topic: Need your advice - Breadboard Arduino Newbie ¦  Replies: 4 ¦  Views: 823

I like the FTDI breakout for the breadboard Arduino I put together (ATmega328P). I'd just start with some simple programs, play with example code and try to get it to do slightly different things... E.g., start with LED blink code and get it to blink fast three times with pause in between. Add a sec...

Re: Locosys LS20031 - no fix

 by shimniok ¦  Thu Feb 24, 2011 3:54 pm ¦  Forum: GPS ¦  Topic: Locosys LS20031 - no fix ¦  Replies: 3 ¦  Views: 1275

Followup: after some kind help from SFE technical support I mailed in the GPS unit which was found to be defective as a new one was sent back to me. I had trouble with the new one... until I removed it from the solderless breadboard, and connected using wires keeping it away from the breadboard and ...