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Electronics / Arducopter in Loiter Mode to with Tersus RTK
« Last post by Tersus GNSS on September 26, 2016, 01:28:10 AM »
Arducopter in Loiter Mode to with Tersus RTK … Check it out…
Original from Mr. Michael Oborne and his Ardupilot Dev Team in Australia.

I am a GPS RTK engineer from Tersus GNSS. Tersus GNSS is a start-up company from Switzerland who make least expensive, reliable, centimeter-level positioning accuracy GPS RTK boards for surveying, precision agriculture, and drones, etc. Our RTK boards can be integrated to other host devices or served as an independent GNSS receiver at a very affordable price.

In the meantime, we offer bundle kit with related antennas, cables which aim to make your application easy and convenient. If you are interested and want to know details of technical specifications, drop us a line to [email protected] or visit www.tersus-gnss.com
Electronics / Cookid Smart Humanoid Robot
« Last post by carloliu on September 23, 2016, 03:35:39 AM »
According to the report released by Chinese Ministry of industry and information technology, The Chinese service humanoid robot market has entered a stage of rapid growth. China's service humanoid robot annual sales revenue is expected to exceed 30 billion Yuan by 2020. In this case, hundreds of Chinese enterprises are entering the service humanoid robot market. The next blue ocean market is appearing.
For a long time, more than 90% of the global robot field is dominated by industrial robots, which is the inevitable result of the production and manufacture to conform to the market trend.
In the field of global industrial robots, Swiss ABB, Germany KUKA, Japan FANUC and YASKAWA are most famous, are known as the Big Four of industrial robot. They also play an important role in the Asian market, and take up more than 70% of the market share of China's robot industry, almost a monopoly of the robot manufacturing, welding and other higher order areas.
The Big Four are taking a leading role in industrial robots and Few companies can shake their roots in a short period of time. However, for the robot, in addition to industrial robots, service humanoid robot is another major development area. Service humanoid robot, as the name suggests, is the robot imitate human life and provide service to us.
The robot can be divided into two kinds of robot based on the service scene, the personal / home robots and professional service robots. Based on the different functions, it can be divided into various of different types, for example, household robot, entertainment robots, vacuum cleaner robot, medical robots, logistics robot and so on. All of these robots have begun to affect people's daily life and become a service tool in peoples’ life.
From the perspective of social needs, the emergence of service robots and the outbreak is natural. Now, let us look at a group of data, currently the number of Chinese aged over 60 years has reached 226 million, accounted for 14.9% of the total population, it will be reach 17.2% by 2020. Europe, United States, Japan and other developed countries, the aging is more serious, The population over 60 years will reach more than 20%. At the same time, social culture of separation between parents and children in western society bring more issues such as accompany old people, it‘s also lead to a surge in demand for social service person,and cause the phenomenon that the supply is not adequate to the demand. Meanwhile, the lack of demographic dividend and the accelerated aging of the world, also caused the human cost is higher and higher. It can be said that whether from the market demand, or from a commercial point, services humanoid robot already has a broad market, and will play an important role in the future. Currently, the service generally optimistic about the future development of humanoid robots in the global arena, it’s said that it’s expected to exceed industrial robots to be the next blue ocean. There are more than 48 countries are involved in the field of service humanoid robots worldwide and 25 countries have been involved in the world's leading position.
The leading country in robot industry is USA, which is mainly  for the military and medical markets; Germany  has advantages on industrial manufacturing robots. Japan and the United Kingdom have strong capability on service robots, and South Korea is well-known for the entertainment and educational robots.  In China, as the newest top technology, the service humanoid robots become the focus of people’s attention even the technology of Chinese enterprises is not matching to the level of their foreign counterparts  but overall of them are  under steady upward improvement.

In China, many companies entered and invested the humanoid service robot, such as Shenzhen Cookid Technology Co.,Ltd.  They are doing huge efforts on R&D , software and hardware development to get big breakthroughs on key technology , Cookid is striving to narrow the gap between foreign leading enterprises to make the domestic service robot industry become the world's leading Technical field. At present, Cookid released the cool humanoid robot (www.zhsrobot.com)  which has been recognized by consumers.

In China, to develop the humanoid robots is much easier than to develop industrial robots. As a technological industry that can enter people's daily life, it is particularly important that it is very attractive to people . At the same time, with the improvement of people's living standards, intelligent products and technology are accepted by people. Increasing demands and markets will make services humanoid robot become the next blue ocean, please let us wait and expect.

[https://www.youtube.com/watch?v=gXDQJjK3X1k&feature=youtu.be ][/youtube]
Mechanics and Construction / 3D printed Robot Arm
« Last post by nic6911 on September 22, 2016, 04:27:12 AM »

I wan't to share my Robot Arm design with you guys. It's 3D printed and all parts (STL) and an assembly manual can be found on our github. It's the third iteration of my initial design, and it comes out quite nice now. I also spent quite some time on the assembly manual, to make it easy for people to assemble.

To read more about the arm and for links to github, a video and more see:

The design is released under a CC NC-BY-SA license.

Best regards,
Misc / Definition of robot?
« Last post by IvyW on September 16, 2016, 10:09:57 AM »
I'm an editor on WhatIs.com. We cover definitions of robotics terms and I'm looking for clarification on the basic definition of robot. Here's our current definition of robot: http://whatis.techtarget.com/definition/robot-insect-robot-autonomous-robot.

I have always considered a robot to be a physical system but I'm increasingly seeing references to software -- expert systems, for example -- as robots. I've also seen "robot" defined as "any system that replicates a human capability," which seems pretty broad.

Can anyone help me clarify this issue or point me towards a good source?

Electronics / Some explanations on Temperature controlled LEDs
« Last post by Banart on September 16, 2016, 12:59:15 AM »

This is one of the hobby circuits that we can build by our own in our home.The function of this circuit is to indicate the temperature levels using a simple LED.Moreover this temperature controlled led circuit can be used as an indicator to denote the increase in temperature.This circuit uses two LEDs (D1 & D2), IC 7805(IC 1) which is the 5v regulator, IC LM35(IC 2) which is the temperature sensor, IC CA3130(IC 3) is the opamp,Transistors Q1&Q2 and finally resistors R1,R2,R3,R4,R5.Now lets move into the working explanation of this circuit.
Here in the above circuit 9v DC supply is used to operate the circuit.Then the 9v is given into the  5v regulator(IC 1).You can also use 5v voltage supply if you have it with you.Then the temperature sensor (IC 2) is connected to it.The output of the LM35 increases by 10mv per degree rise in temperature.Output of the LM35 is given to the non inverting terminal of the Opamp.The inverting input of the same Opamp can be given with any reference voltage using any resistor R2.And the output of the Opamp is connected to the base of the transistor Q1 and the collector of the transistor Q1 is coupled to the base of the Transistor Q2.And red colored LED is connected to the collector of Q1 and green to the collector of Q2.
The circuit is nothing but two LEDs (D1 and D2), whose status are controlled by the temperature of the surroundings. The famous IC LM35 is used as the temperature sensor here. Output of LM35 increases by 10mV per degree rise in temperature. Output of LM35 is connected to the non inverting input of the opamp CA3130.The inverting input of the same opamp can be given with the required reference voltage using POT R2. If the reference voltage is 0.8V, then the voltage at the non inverting input (output of LM35) becomes 0.8V when the temperature is 80 degree Celsius. At this point the output of IC3 goes to positive saturation. This makes the transistor Q1 On and LED D1 glows. Since the base of Q2 is connected to the collector of Q1, Q2 will be switched OFF and LED D2 remains OFF. When the temperature is below 80 degree Celsius the reverse happens.IC1 produces a stable 5V DC working voltage from the available9V DC supply. If you already have a 5V DC supply then you can use it directly.


The circuit can be assembled on a Vero board.
IC3 must be mounted on a holder.
The temperature trip point can be set by adjusting POTR2.
Type no of Q1 and Q2 are not very critical. Any general purpose NPN transistors will do it.

If the reference voltage is 0.5v then the voltage at the non inverting input becomes 0.5v when the temperature raises to 50 degree celsius. So that both of the voltages get into the comparator as a result the output of the Opamp (IC 3) enters into the positive saturation.This trigger the transistor Q1 on and as a result the LED glows indicating the rise in temperature above 50 degree celsius.Since the base of the transistor Q2 is connected to the collector of the Q1 it remains in off state.When the temperature is below 50 degree celsius the reverse process happens making the LED 2 is light up indicating that the temperature is below 50 degree celsius.The temperature limiting range can be modified by adjusting POT R2.Now your all new homemade temperature controlled LED is ready.
Mechanics and Construction / Re: Anybody make their own wheels?
« Last post by JustANerd on September 08, 2016, 02:26:21 PM »
Hmmm, never messed with that OS. I'm still using raspbian. My main problem is with wheels is that the only 14" diameter I can find are either way too heavy, or too narrow to keep from sinking because of weight. This sucker is going to have some mass to it. Aslo, I'm not willing to spend over a  hundred bucks on cheap plastic. lol
Mechanics and Construction / Re: Anybody make their own wheels?
« Last post by mklrobo on September 08, 2016, 01:25:04 PM »
 :) Hello!

In reference to your wheels, I would try Tractor Supply. American Science and Surplus (online)
has some wild items, that may help.
        Insofaras your Raspberry Pi, the problem with that will be integrating RPIO library into
your kernel. The main language I have seen for the Pi is Python, which I like a lot.
(another C++ library extension) I bought Wheezy for my Pi, and still can not figure out
how to load the RPIO module into it. (You must have RPIO to control your inputs/outputs.)
  :'(  I am so unhappy!
Mechanics and Construction / Anybody make their own wheels?
« Last post by JustANerd on September 07, 2016, 03:09:31 PM »
Hey folks!

First time on the site, and first post.

I've been pretty mechanical my entire life, and as a kid I used to try to build robots all the time. Now that I am an old man and pretty much disabled, (hips and back are shot due to an old injury) I have a lot of time to kill. Picked up a book on how to build a raspberry pi robot. He uses some parts that are just really impractical for me. One is the wheels. I can't find the powerwheels parts in the right size no matter where I look. So, I am considering trying to make my own.

I am thinking plywood and hardboard. Pluwood for the hub, and hardboard for the "tire". Hardboard can be bent easily with a heat gun, so that part is no problem at all. Found some traction strips that are rubber from my local hardware store, so slippage won't be a problem either. Only issue I might see is deformation of the hardboard from moisture outside, but I think I can seal it well enough to keep that from happening.

This ends up being a pretty large bot, so I was wanting some opinions. 3/4 ply for the hubs, spoked and/or holes to lighten it up without losing integrity is my preference. Any other ideas?

book I bought:  https://www.amazon.com/Make-Raspberry-Pi-Controlled-Robot-Building/dp/1457186039/ref=sr_1_1?s=books&ie=UTF8&qid=1473284119&sr=1-1&keywords=raspberry+pi+robot
Mechanics and Construction / wheelchair motor : removal of wheel hub
« Last post by anilkumar15 on September 06, 2016, 07:03:43 PM »

I need help. I have invacare wheel-chair motor with wheelhub .
How do you remove the wheel hub from the motor?
There is a mounting bolt at the center of the wheel-mounting hub . Does it need to be rotated clock-wise or anti-clockwise to remove it ?
Is there any trick for it ?

Anil K.
Misc / Mechanical vs optical/software shape recognition - need some guidance
« Last post by Loz on September 02, 2016, 06:30:13 PM »
Hi all,

I've spent the last few days doing research and am hoping someone can provide some guidance on which path I should take.

End goal: a sorting machine that can sort hundreds, potentially thousands of different small parts based on shape and colour. shape and colour would both be from a list that could be defined, think lego :)

I've been doing research for the last few days on how to do this and I've come to two possible solutions.
1. a system that takes up an impractical amount of space, to mechanically sort based on parts going down a conveyor and being passed over different profiles to match pieces. there would then need to be a 2nd smaller device to sort based on colour. the only way I see this working is if I have "cards" that have the profiles laser cut/machined and based on my needs at the time, I slot the cards I need into place in the sorter and everything else drops into a "misc/unsorted" bin at the end.

2. shape detection. in my mind, I imagine:
 a very small conveyor with a bin at the beginning (parts in) -> a detector section which would have a camera top and side to detect the appropriate profile -> colour sensor -> to what would then be a series of paddles that would flip left/right and guide the part off the side of the conveyor at the appropriate point.
my idea also has this in a "learning mode" of sorts each time its powered up. lets say there's 20 bins that items can be sorted into none of which are allocated to any part. the first part that goes through we'll call it "A", doesnt match anything the system allocates bin 1. the second part, lets call it "C" goes through and the system allocates bin 2. now any subsequent time part A or C go through it will detect a match and flick it off into bin 1 or 2. now after 30 odd parts going through a new part shows up, and it does the same process again. any parts over the bin limit get shuffled into a final "bin 21" that is the un-sortable stuff.
While I understand the mechanical platform and I could build that no worries, it would be huge and time consuming to be swapping out the cards by hand. I'd also have to make and store potentially thousands of different cards which would be painful, especially when I need to find that 1 in 5000.

now the research I've done on shape detection, it seems quite complicated software wise. either that or simply my lack of knowledge on the subject means I perceive it as extremely complicated. OpenCV is what I see to be the most likely candidate, there's no way I can afford any of the paid products for a hobby project :). I did also wonder if a Pixy & arduino would do the job, but training the pixy each time would probably be just as arduous as sorting parts by hand.

I'm stuck on deciding to try something new, and go down the software shape recognition path or going with what I know would be expensive, limited by space, and time consuming to build (mechanical).

Thanks in advance all!
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