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Re: AVC Combat Bots Rules and Errata

 by satacoy ¦  Mon Sep 12, 2016 1:32 pm ¦  Forum: Sparkfun Promotions and Competitions ¦  Topic: AVC Combat Bots Rules and Errata ¦  Replies: 5 ¦  Views: 11670

I saw an unofficial response on Facebook last night that wedges will be allowed. They did appear to copy the wrong section.

Again, that's unofficial, but that's my understanding.

Pete - Team Cosmos

Re: Issue w/ Sparkfun Thing + Thermocouple breakout

 by satacoy ¦  Sat May 14, 2016 10:28 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Issue w/ Sparkfun Thing + Thermocouple breakout ¦  Replies: 1 ¦  Views: 362

Nothing like banging your head against a problem all day, finally asking for help, then figuring things out a few minutes later... It appears that the power supply is to blame. Even though it shows a solid 5.0v and 12.0v output, once I hooked my breadboard up to a regulated bench power supply, the p...

Issue w/ Sparkfun Thing + Thermocouple breakout

 by satacoy ¦  Sat May 14, 2016 9:26 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Issue w/ Sparkfun Thing + Thermocouple breakout ¦  Replies: 1 ¦  Views: 362

I'm having an issue when using the Sparkfun Thing Dev Board with the Sparkfun Thermocouple breakout board (MAX31855k). I have a basic sketch working that reads the temperature of the thermocouple from the breakout board successfully. This works fine when I'm powering the Thing from the USB cord. How...

Re: AVC 2015 - Combat Entry - Angry Accountant

 by satacoy ¦  Tue Jun 23, 2015 5:37 pm ¦  Forum: Sparkfun Promotions and Competitions ¦  Topic: AVC 2015 - Combat Entry - Angry Accountant ¦  Replies: 5 ¦  Views: 3164

Angry went 2-2 at the competition. Not as well as I hoped, but not bad for a no effort showing. I had a blast at the competition and meeting a few new faces. I thought the competition ran smoothly. There was a lot of spectators, it was great to see so many people interested in fighting bots. One com...

Re: Arduino with WS2812 using NeoPixel library fade in/out

 by satacoy ¦  Tue May 05, 2015 7:40 am ¦  Forum: Projects ¦  Topic: Arduino with WS2812 using NeoPixel library fade in/out ¦  Replies: 1 ¦  Views: 1161

You'll need to create an array (or multiple arrays) to hold the current RGB values of each pixel. You'll also need to keep track of whether each pixel is getting brighter or darker. In pseudo code, it'd be something like the following. You'd have to expand it out if you wanted to do true RGB values....

Re: Stable Arduino Quadcopter with 30 min flight time

 by satacoy ¦  Wed Apr 22, 2015 6:32 am ¦  Forum: Projects ¦  Topic: Stable Arduino Quadcopter with 30 min flight time ¦  Replies: 1 ¦  Views: 397

Very nice!

Re: Self balancing skateboard

 by satacoy ¦  Tue Apr 21, 2015 10:26 pm ¦  Forum: Projects ¦  Topic: Self balancing skateboard ¦  Replies: 47 ¦  Views: 6512

I've put together a "build report" up on the website: http://teamcosmos.com/SkateTwo/index.shtml I'll update this here and there as I refine things. I'm still waiting for some nice weather to shoot some video of the thing outside at speed. I'm also planning on doing a rewrite of the software to impr...

Lights Installed

 by satacoy ¦  Sat Apr 11, 2015 6:18 pm ¦  Forum: Projects ¦  Topic: Self balancing skateboard ¦  Replies: 47 ¦  Views: 6512

I put the finishing mechanical touches on the board this weekend. Now it's just down to software. The LED strip went on easy. There ended up being a total of 103 addressable LEDs on the strip. http://teamcosmos.com/SkateTwo/IMG_3141-sm.jpg Here's a comparison of the two boards. The new one is defini...

Almost Done

 by satacoy ¦  Mon Mar 30, 2015 9:15 pm ¦  Forum: Projects ¦  Topic: Self balancing skateboard ¦  Replies: 47 ¦  Views: 6512

I finally got a few hours this weekend to make the last few mechanical modifications. I was a bit nervous, it'd be a drag to really screw something up with the second to last cut. I installed a few cable guides, along with the IR/Bluetooth module. http://www.teamcosmos.com/SkateTwo/guide1.jpg http:/...

Re: Using a Gyro For Determining Tire Rotation

 by satacoy ¦  Mon Mar 23, 2015 9:06 pm ¦  Forum: Projects ¦  Topic: Using a Gyro For Determining Tire Rotation ¦  Replies: 18 ¦  Views: 1025

Read up on "rotary encoders". That's what I've used in the past to determine RPM.

Quick Update

 by satacoy ¦  Wed Mar 11, 2015 8:52 pm ¦  Forum: Sparkfun Promotions and Competitions ¦  Topic: AVC 2015 - Combat Entry - Angry Accountant ¦  Replies: 5 ¦  Views: 3164

I picked up a few new batteries for Angry. It's amazing how cheap LiPos have gotten since the last time I looked. A small 500 mAh 2 cell (7.4v) LiPo costs about $5, much better than the roughly $20 I remember back in the day. I charged up the battery, weighed in, and gave things a shot. http://www.t...

Shielded Cable

 by satacoy ¦  Mon Mar 02, 2015 8:13 pm ¦  Forum: Projects ¦  Topic: Self balancing skateboard ¦  Replies: 47 ¦  Views: 6512

I rewired the microcontroller and motor controller with a length of shielded Cat6 cable. It made all the difference in the world, things run as smooth as silk now. Now that that mystery is behind me, I'll get back to the last few items (there always seems to be a few more to take care of). Hopefully...

Re: Self balancing skateboard

 by satacoy ¦  Thu Feb 26, 2015 7:28 am ¦  Forum: Projects ¦  Topic: Self balancing skateboard ¦  Replies: 47 ¦  Views: 6512

I wish I could easily use a higher reduction, but to get much more you'd have to do a two stage reduction. At some point the sprocket on the wheel gets larger than the wheel itself. The motor doesn't get hot, it will warm slightly after 15 minutes of screwing around on the skateboard. I think I can ...

Re: Self balancing skateboard

 by satacoy ¦  Wed Feb 25, 2015 9:28 pm ¦  Forum: Projects ¦  Topic: Self balancing skateboard ¦  Replies: 47 ¦  Views: 6512

Thanks for the post, his post sure sounded in line with the situation I'm in. Someone on the OSMC forum had also suggest grounding both ends of the shielding. I'm following a suggestion from there, and am going to try shielded CAT6 cable first. I'll snip the jacks off the end, split out the twisted ...

Re: Self balancing skateboard

 by satacoy ¦  Tue Feb 24, 2015 8:12 am ¦  Forum: Projects ¦  Topic: Self balancing skateboard ¦  Replies: 47 ¦  Views: 6512

What I'm calling the "signal cable" is the cable that runs from the micro-controller to the motor controller. It's a ten wire ribbon cable, several of the wires are held either high or low, and two of them are PWM'd at 8khz. I was guessing that the motor was interfering with the PWM signal which con...