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71
Mechanics and Construction / [advertisement] New Stepper Motor Mounts
« Last post by ServoCity on April 04, 2014, 09:18:06 AM »

These new stepper motor mounts allow you to integrate stepper motors into your robotic project that requires precise position control.  By incorporating the .770” and the 1.50” hub pattern, it is easy to connect nearly any Actobotics™ component including channel.  Mounts are machined from 6061-T6 aluminum for superior strength and durability. Start building your 3D printer or precision camera slide now!  Each mount will come with the fasteners required to attach your stepper motor. Sizes available – NEMA 14, NEMA 17 (NEMA 8, NEMA 11, and NEMA 23 coming soon!)

http://www.servocity.com/html/stepper_motor_mounts.html#.Uz7JevldV7s


72
Software / Robotic vision: Coding issues
« Last post by jtetera on April 04, 2014, 08:46:33 AM »
Hello.
After finishing my third minisumo robot, i decided to make a robot for playing football, navigated via CMOS vision sensors (was thinking about the one located at http://www.adafruit.com/products/397 ). However, i can't find any useful code for the processing (blob detection, will be used for detecting the ball). It will not be used for ranging (have ultrasonic sensors for that). Currently i have no idea about such systems and only used I2C once or twice.
I am using Arduino Uno. I'd also appreciate examples for other platforms and other camera chips. My goal is just to get the damn thing working.

Thanks in advance.
73
Mechanics and Construction / Re: Electronic components
« Last post by venturemfg on April 04, 2014, 04:23:25 AM »
On ebay you find sources that offer free shipping. For me the best way is to buy direct from those manufacturer's website  that are not very big players and ask for free shipping. They also agreed on that (most of times) if I am buying a good amount of products from them.
74
Misc / Re: Stepper driver
« Last post by drinu on April 04, 2014, 12:02:21 AM »
Any help please?

Your help will be highly appreciated.
75
Electronics / Re: Charger for a 6V 2000mAh NiMH Battery, with the Hitec Connector
« Last post by waltr on April 03, 2014, 09:11:27 AM »
It is not uncommon to need to make adapters from one type of connector to another.

A reasonable priced charger that works well is the IMAX B6. This does come with adapters to most of the popular hobby battery connectors.
http://www.skyrc.com/index.php?route=product/product&product_id=9

This charger will work fine for that battery. Just be sure to use the battery specs to setup the charging (1C max charge rate).
76
Electronics / Charger for a 6V 2000mAh NiMH Battery, with the Hitec Connector
« Last post by CeresVoyager on April 03, 2014, 03:46:01 AM »
Hi anyone that reads this,

i am a total newbie at this and have recently decided to get involved in robotics, as i have always wanted to. Anyway, I am ordering the parts for the $50 robot but I am not able to find a charger that has the right connector for this battery: http://www.tenergy.com/11112

Can somebody help me and offer a solution? I was thinking of getting a normal charger with a tamiya connector and getting an adapter for the connection of to the hitec connector on the battery. However, if someone can offer a better solution that hopefully requires no adapter, that would be amazing!

Thanks,

CeresVoyager
77
Mechanics and Construction / Re: Actuators for robot arms
« Last post by venturemfg on April 03, 2014, 03:27:21 AM »
For payload of ~2kg pneumatic actuators are fine to work with. He can go for other precised actuators when looking to implement some more serious activity.

Correct me if I am wrong.
78
If the encoder only swings 0.79 volt, you will not get good readings from the Arduino that way.
Try conditioning the signal with a properly calibrated Schmitt trigger, perhaps?
79
Hi all,
     I am trying to control the angle of rotation of dc motor using encoder. I have used the attachinterrupt function to get the input from the sensor, and the change in input is taken as count of the angle. The problem is its not detecting the input properly. while checking the input voltage of the sensor is around 0.79V.
please tell me what am i doing wrong, is there any other way to control?

Any kind of help is appreciated. Thanks.
80
Mechanics and Construction / Re: Actuators for robot arms
« Last post by jwatte on April 02, 2014, 09:12:04 AM »
Pneumatics are cheaper, but less precise. If he's already worrying about backlash through a strain wave or cycloidal gear, pneumatics are probably an order of magnitude out of spec...
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