Recent Posts

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21
Robot Videos / Motion Planning GUI for Humanoid Robot NINO
« Last post by karthikram570 on February 17, 2017, 06:45:19 AM »
22
Software / Using a rotary encoder
« Last post by vinnygalbo on February 16, 2017, 01:15:27 PM »
Hi,

The only 5 pin rotary encoders I have encountered used 3 for 'encoder' part and the other 2 pins were for a momentary push button in the shaft; I haven't seen one that names a 'CLK' signal etc. I'm trying to see activity in the serial monitor. The encoder in question is an Accu-Coder.

http://www.clrwtr.com/PDF/Accu-Coder/Accu-Coder-960-Absolute-Encoders.pdf

Thank you in advance for any help.
23
Electronics / Wireless boat for college competition
« Last post by ojastayal on February 13, 2017, 11:09:42 AM »
Hey everyone, so I'm participating in a competition in my college that's pretty simple but then again I'm a complete novice when it comes to robotics. I need to construct a boat that is capable of performing certain tasks. Last year I have seen people compete by making wired bots but that was extremely cumbersome to operate and required 2 people just to hold the wires. Hence my question for you guys is this -

I need suggestions for a Tx/Rx set (note that the Rx will be on a boat so preferably water resistant) that can offer me the following functionalities -
1) Running a propellor (controllable high rpm and reversible DC motor)
2) Controlling a rudder (servo)
3) Operating a winch (single low rpm but reversible DC motor). Will be carrying a load of about 100-150 g of weight (a magnet permanently fixed and a piece of iron that needs to be picked up)
4) Generating a stream of water (need help with this one). Needs to be able to direct a steady stream of water at a point (in order to tear a tissue paper fixed in a spot in one round and fill up a bowl placed 50 cm high in another round). I can manually change the direction of the pipe generating the stream between rounds so no mechanism to control stream direction needed.
Also need suggestions on the motors and servo as described. Please note that bot mustn't be bigger than 45cm * 15cm and I need flat clear space in the middle to carry a 4cm cube. I can handle the mechanical parts and bot creation/arrangement, just need help with the electronics.

I know I might be using very poor terminology but I honestly don't know better unfortunately though I'm very willing to learn. If possible, please suggest makes and models (preferably cheap and easily available) or correct terms that I could use to get what I need from a dealer. Also if you recommend any links for me to read, I shall go through those too.
24
Misc / [advertisement] 15% OFF Everything!
« Last post by ServoCity on February 13, 2017, 10:17:28 AM »
We're celebrating this Valentine's Day by sharing the love. Don't miss out - one day only! Valid for online orders only.
https://www.servocity.com

25
Electronics / What Wheel encoders to buy?
« Last post by rahulrameshbabu on February 12, 2017, 02:17:52 PM »
I am building a differential drive robot and I need s wheel encoder kit that will fit on a 6mm shaft. Can you guys please post some links of encoders preferably under 30$?
26
Misc / article on the current state of autonomous cars
« Last post by Admin on February 10, 2017, 10:48:16 AM »
Anti-accident technology will become a requirement like airbags, and combustion engines will get replaced by fuel cells. The industry is threatened by increasing telecommuters and Uber/Lyft alternatives. I suppose Zipcar is a dead company? When insurance becomes cheaper for safer autonomous cars, that's when autonomous cars will really kick off.
http://www.bbc.com/news/business-38378018

27
Robot Videos / neat new ultra-light dynamic biped
« Last post by Admin on February 10, 2017, 09:27:50 AM »
The latest impressive work by Jonathan Hurst (a CMU Robotics Club alumni). What the article does not mention is that the success of this robot is partly due to its extremely light-weight design.

http://spectrum.ieee.org/automaton/robotics/industrial-robots/agility-robotics-introduces-cassie-a-dynamic-and-talented-robot-delivery-ostrich

28
Misc / Tech Tip - Comparing Linear Servos & Linear Actuators
« Last post by ServoCity on February 02, 2017, 11:09:42 AM »
In this Tech Tip video Kyle and Jason break down the differences between linear actuators and linear servos as well as various ways you can operate them.
https://www.servocity.com/motors-actuators/linear-actuators

29
Electronics / indoor tracking of fast moving object
« Last post by michelco on February 02, 2017, 08:20:48 AM »
Hello!

I am doing a project which will have an RC car drive autonomously using MPC. For this I need an indoor 2d tracking system. The RC car will be fitted with an IMU and I am looking to use a beacon system and combine these two using an extended kalman filter. However the beacon system has an update rate of 40 hz with a latency of 20-25 ms. How will this impact the correction part in the kalman filter, seeing as the correction data will be 20-25 ms old when it arrives?

Perhaps this was the wrong sub-forum, admin can feel free to move the thread where they see fit
30
Electronics / Beg. level "How to build a robot" (with Arduino)
« Last post by johnny6 on January 29, 2017, 11:20:12 AM »
Greetings.  :)

I read through the "How to Build a Robot Tutorial", but I already have an Arduino Uno with a kit.  I have some servos and sensors too.  I was wondering if there is a beginner tutorial for those that have an Arduino already.  Perhaps I have everything that I need, without spending more money?

I did a quick search, but there are a lot of results to filter through.  I didn't notice a sticky. 

Thank you for your time.

-Chris
:)
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