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21
Electronics / Re: Robot Fingers
« Last post by mklrobo on March 24, 2015, 05:50:51 AM »
 ;D Hello!
There was a person in the forum that started to build a robot hand,
actuated by muscle wires, (nitrinol(?)). Another option,  ;) Consider cables in the hand controlled by one motor, or several. Keep me posted.. ;D ;D
22
Electronics / Robot Fingers
« Last post by RoboEd on March 24, 2015, 04:15:16 AM »
I am attempting to build my first robot and have gone for a roboti arm so that I can learn about motors.  One thing I would like is to have fingers where each section bends at the same rate for realism. Would it be possible for this to be controlled from just one motor where the knuckle would be on the human hand? Or would I need a separate motor at each joint of the finger?  Any help would be very much appreciated!
23
Mechanics and Construction / Re: Robot Construction Log
« Last post by bdeuell on March 23, 2015, 12:42:08 PM »
very interesting about the high efficiency relays, I was not aware of the use of permanent magnets in relays.
thank you for sharing.

On the topic of using older electronics technology and voice recognition I saw this video a few weeks ago on a voice recognition chip (apparently designed with robots in mind) http://www.eevblog.com/2015/02/11/eevblog-713-vcp200-voice-recognition-1980s-style/. Im not sure if you can still find the chip shown or a substitute but you may find it relevant.
24
Mechanics and Construction / Re: Robot Construction Log
« Last post by FIFO on March 23, 2015, 11:13:06 AM »
 
Quote
I'd agree with the comments about K-9. It'd be a cool addition to the project to create an outer case similar to K-9, if you're a fan of the show.
   
    That is a good idea and I will definitely consider doing that, however I would like to get the robot working before I work on the aesthetics.

    I have made some progress on the robot and have been able to etch and solder two of the PCBs for the robot. The first one pictured is a voltage regulator circuit, and the second is a relay board that will allow the processor to interface to the motors.

    The voltage regulator is a LP3852 low dropout linear voltage regulator. With a price of four dollars it is not cheap, however its characteristics made it extremely desirable for use in the robot. One of the features that makes is valuable is the fact that the dropout voltage is only about 250mV when driving a 1.5A load, allowing me to use the 6V batteries I was planing on using in the robot.

    I also learned something new about relays, and unfortunately I learned it the hard way. When selecting relays, I tried to find some that was both cheap and would not require a lot of current to drive. After I found some that seemed adequate, I constructed the PCB and soldered the relays only to find that the relays would not activate. After checking the data sheet for the relays I found that they was described as a high efficiency relays. I did some reading online and found that some high efficiency relays use permanent magnets to make it easier for them to switch and are therefore polarized. I was then able to modify the PCB to fix the polarity issue with the relays.
25
Misc / Re: Analyzing the Axon series: Coding, Contruction, and Contraptions
« Last post by mklrobo on March 23, 2015, 08:16:47 AM »
 :) Great idea, mallster!
Also, any mechanical drawings that need to be done, I plan to
put them in Inventor autodesk software. The tutorials are good
reference; but, as I look into the forum, I do not see many people
sharing code for their robots, in the Axon series.  It will take awhile
to get to the end project, but it will be fun! (have to save up money too!)
Thanks!  ;D ;D ;D
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Misc / Re: Analyzing the Axon series: Coding, Contruction, and Contraptions
« Last post by mallster on March 23, 2015, 03:08:21 AM »
Hi mklrobo,

Just a suggestion- Maybe Webbot studio would be a good way to document and share your project. As a lot of the heavy lifting is already done.

Look forward to seeing what you can come up with.

Mallster
27
Electronics / Re: switch
« Last post by Ibaeni on March 22, 2015, 10:51:52 AM »
No it does not. Essentially what a really basic switch does is disconnect and reconnect the wire. I'll put a link to an example switch below. Basically what is happening is that when you switch it on, the wire is reconnected and when it is flipped off the wire is disconnected.

This link has a good picture of how to turn a light on and off with a switch. It is the same idea with your circuit, except instead of a light, it is a more complicated circuit.
http://www.homelightingtips.org/light-control-systems/light-switch-diagram/

Below is a link to an example switch from sparkfun.
https://www.sparkfun.com/products/9276
28
Electronics / Re: switch
« Last post by ruddock1234 on March 21, 2015, 03:48:32 PM »
So it doesn't have to be connected to ground
29
Electronics / Re: switch
« Last post by Ibaeni on March 21, 2015, 02:17:27 PM »
You could simply put one in series with the positive lead of the battery. A simple SPST switch would do the trick.
30
Electronics / switch
« Last post by ruddock1234 on March 21, 2015, 01:26:44 PM »
How do I add a switch to this circuit to turn battery on and off
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