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Electronics / Re: Elecrow New Products -- Crowtail Modules
« Last post by mklrobo on May 25, 2015, 04:00:45 AM »
 8) Awesome!  8)
I looked through your webpage. Does Elecrow offer a voice control
module on their product line? There are a lot of people on the forum
who would buy such a product. Thanks!   ;D ;D ;D
Electronics / Elecrow New Products -- Crowtail Modules
« Last post by drofan on May 24, 2015, 09:47:43 PM »
Elecrow dedicates to help makers and Electronic beginners’ makings easier and faster. With the Crowtail products, users can be more focus on the concepts and ideas rather than the detailed basic electronic circuits and programming.

Composition of Crowtail
The Crowtail series products are composed of 2 functional parts: the Crowtail Base Shield, and the other functional modules.
The Crowtail Base Shield:
The Crowtail Based Shield is a standard IO expansion board of the Arduino. It regulates the IOs of Arduino to standard Crowtail interfaces, which can be sorted into 3 kinds: Analog(A),Digital(D), Uart(U) and IIC(I);
The Interfaces that marked “D” are the digital interfaces, which can be used to read or control digital Crowtail modules(Crowtail modules that have a mark “D”) such as button or LED. Besides, some digital pins can be also used to generate PWM outputs. The “A” marked interfaces are “analog ports” with digital functions and beside this, these ports can read the analog signal, such as a potentiometer or light sensor. In addition to this basic function of digital port, the interface “U” can be also used for the UART communication, such as the Wifi module or Bluetooth module. The interface “I” is for the IIC Communication and users can utilize 2 IIC modules at the same time.
Crowtail functional modules:

Currently, there are more than 30 kinds of the most popular Crowtail modules being available, including: the basic environment sensing modules like temperature / light / moisture / sound loudness / Barometric pressure sensing modules; and the basic human interface modules like LED/Buzzer/Button/Touch/OLED Display/Joystick; and other modules such as the RTC/BLE(Bluetooth 4.0) /ESP8266 WIFI and so on.

Great Features of Crowtail:
Differ from other modules, Crowtail has many great features. The Crowtail is a ready-to-use tool set. Users can use them like the Lego to create the project they like. Moreover, it simplifies the learning process significantly. Each Crowtail module supplies basic functions such as environment sensing and human interfacing. Besides, there are many other excellent features such as 1. Very easy to use 2. User-friendly design.3. Grove compatible. 4. Cost-effective.
 ;D Hello!
your request;
Is it possible to derive the shape of the profile and the 3d coordinates of the intersection, from a video?
I had been thumbing through some tech papers, and ran across some options. The goal you seek may lie
in video forensics. (If this was CSI, we'd have the answer in an hour. Ha!  ;) )
If this could be done (cheaply), people in this forum, like Kobratek, could use this to convert
parts to dimensions in no time. Obviously, more information is needed, but maybe still on the right
I had to provide an accurate scale of a part at work, and so, I put a grid in the background of the picture.
This provided scale and angle perspective.  8) In that context, if you had three cameras in an X, Y,  and Z coordinate position from the target, that may be a starting point for your goal. If the cameras could be adjusted to focus on certain distances from their position, maybe this would give "layers"
of perspective for target spacial definition.(  ???) Using sound as a depth gauge could be used. Also, maybe using lasers (only the camera can see) in different shaped may give depth perception. Consider this;
If you used a laser that emitted a circle, that provided many ringed concentric projections( ring projections
are set at a measured distance from each other), this could help provide depth perspective, and be invisible
to the user in infrared/ultraviolet lasers are used.  Good luck!   ;D ;D
Software / Re: real time operating system
« Last post by voyager2 on May 24, 2015, 12:20:25 AM »
You haven't specified what device you would like to target your RTOS (Real Time OS) to so i am going to assume a small microcontroller (eg: PIC/AVR).
You might want a monolithic kernel actually, not a micro kernel. A microkernel can be very hard to implement on a small device because it requires complicated signalling between processes/tasks. Microkernels are better suited to more powerful machines like i386, x64, etc. A monolithic kernel is easier for a beginner to program and a better choice for a RTOS.
This (http://wiki.osdev.org/Main_Page) site has a lot of info on OS design and implementation.

[...] you might want to
use a mini-kernel called, MINIX. This was the first primitive linux kernel made [...]

Linux != MINIX
(MINIX == unix-like) && (Linux == unix-like)
Linus and Tanenbaum had a famous argument about this.
  I did imagine something like that would be the issue. But would it be possible to get accurate coordinates using 2 or more cameras?
The optical illusions would be avoided, and most angles should be covered that way. Also, I was planning to use a sort of landmark in the field of vision which would basically be a reference as by having its distance from the camera known.
What I need to know is, will this method give me accurate enough coordinates so that, say a robot arm can trace them and complete the weld? 
Misc / Re: Analyzing the Axon series: Coding, Construction, and Contraptions
« Last post by mklrobo on May 23, 2015, 01:36:46 PM »
Axon Series: What is this thing?
I was looking through the AVR Studio 4 software, and found a feature of the software that is pretty cool.
When you open the software, on the right part of the screen, are the parts of the MCU that can be used.
This is the Axon simulator, which enables you to write a program in the software without actually
programming the Axon. This allows you to eliminate errors in your programming, while streamlining
the purpose of your application. The usage of the simulator requires more discipline in learning this
integration. The advantage of the simulator  is that you can program the Axon anywhere with your PC, without the
physical interface.
   8) You have to set up all the external items (motors, switches) with input files allocated in
the simulator. When running the program in the real world, if the external items you used do not come close to the parameter input file you set up, things could get interesting in troubleshooting.  :o 
Misc / Re: Evolution Robotics, ER1 Robot, and ERSP Thread.
« Last post by mcarraher on May 23, 2015, 09:58:03 AM »
Thank you Gabriel for the access, much appreciate it

Just a reminder for all people that have developed new stuff with their ER1, please upload to Dropbox so the other members can try it out. If by any chance you don't have an invite to the Dropbox account, let me know and I will add you.

Thanks to all,

Just got a er1 robot and I was wondering if the dropbox is still available, if so could I be added to it. email [email protected]
 8) Cool problem!   8)
I can offer only logical options; I am stumped at the programming of the Axon. I expect to
overcome this soon.
The tutorials in this forum cover camera AI. I do not know if there is enough information for you
to use to your advantage. There are some instructive videos in the video section that may offer options too.
Your request;
My question: Is it possible to derive the shape of the profile and the 3d coordinates of the intersection, from a video?
My response would be, yes, but may be expensive, depending on your objectives.
Industry used lasers in a calibrated area to determine the dimensions of your pieces to be welded. information from
video itself may prove problematic, because of scale and possibilitiy of optical illusions. (?)
Scale, space, emplacement of video are factors to be considered.
Cameras can pick up different spectral emissions, which may add to your advantage, as well as depth perception. (?)
Good Luck!  :) :D ;D
Mechanics and Construction / Re: need help for a newbie project
« Last post by mklrobo on May 21, 2015, 07:46:26 AM »
 ;D Hello!
Sounds like you need a locking solenoid. I think mouser used to sell these, Digikey might have them.
When the first volt pulse comes in the solenoid pulls in and locks into a position. Another voltage,
and the solenoid unlocks and goes to the other extreme. I have not seen on of these in a long time.
You may be able to get by with a locking relay, which controls a 2 solenoids; push pull effect.
May this idea well help unlock your options. Good luck!   ;) :) :D ;D
Electronics / Re: New member from Vancouver
« Last post by mklrobo on May 21, 2015, 07:41:37 AM »
 ;D Hello, and welcome to the Forum!  8)
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