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31  Using Arduino / General Electronics / Arduino Mega current supply??? on: February 10, 2014, 08:05:53 pm
Hello,

 I'm working on a project that has many sensors/servos/relays and a RGB LED and a lcd screen. I want to make sure I'm within the bounds of the onboard voltage regulators. I know that I can supply 50ma from the 3.3 v pin which should cover my sensors, and that I can supply up to 50 ma from each digital out put which will be good for my RGB led, but what is the total current limit of the 5v regulator that the Mega has. I cannot find any specs. If worst comes to worst I will just use a  separate voltage regulator, but I would rather not.  smiley

Thanks,
Drew Davis
32  Topics / Robotics / Re: Line Follower with one sensor - Help to improve the code on: January 30, 2014, 08:31:11 am
Please explain what does not work.
33  Using Arduino / Project Guidance / Re: Simple Power Switch Help on: January 07, 2014, 04:56:12 pm
First off what power supply are you using? It might not have enough amperage output  to power both things. If it does you could splice the wires or if you want to buy something pre made use this. 
https://www.sparkfun.com/products/11705


 Before ordering your splitter and the switch make sure your power supply has a high enough amperage rating if not use this .

https://www.sparkfun.com/products/8269



Best of luck!
34  Using Arduino / Project Guidance / Re: Plug two devices that communicate through Serial on Arduino Uno on: January 07, 2014, 04:50:47 pm
I would believe  that it can be done, but I would just go with the mega if possible. Would take a lot less work.
35  Using Arduino / Project Guidance / Re: xbee wireless communication on: January 07, 2014, 04:45:51 pm
Are you still working on this?
36  Using Arduino / Project Guidance / Re: Arduino Board Selection on: January 07, 2014, 04:45:18 pm
I second the servo idea... the amount of weight you are using is trivial. Look at spark fun and servo city. You will not need a separate controller and you will be able to move it accurately.

 If you use a motor it would probably be a gear motor... a un-geared motor will have high RPM but hardly any torque, then again you don't need much torque.  If you go this option checkout spark fun. Keep in mind precision will be hard with this method .

A MOSFET will be able to control the speed, but not direction of a motor. A motor driver Is the same thing as a shield it just does not snap on top. Everybody will tell you that.


Best of luck!
37  Using Arduino / Project Guidance / Re: Arduino Board Selection on: January 05, 2014, 10:47:05 pm
"There will be fairly little torque resisting the motion on both motors"

That is no help. What is fairly little torque? Also that torque is somewhat a nonissue when selecting a motor driver. We need the Amperage... although related to torque it is not the same thing at all.  As far as the motor shield why do you want one? Use a driver... same thing but it does not snap on. You could also use a MOSFET.

small size: https://www.sparkfun.com/products/10213

very small size: https://www.sparkfun.com/products/9457

relatively small size:  https://www.sparkfun.com/products/11080

Best of luck!

38  Using Arduino / Project Guidance / Re: xbee wireless communication on: January 05, 2014, 10:41:25 pm
What program(s) have you tried? Have you used any code or just given up before that point? Next time post the code you have tried to just say that you have not used any.


To send wireless signals you need to use the serial.print function. 

This link should be helpful. It gives your a walkthrough + all the needed code!     
http://bildr.org/2011/04/arduino-xbee-wireless/



Best of luck!
39  Topics / Robotics / Re: Wireless Video Streaming? on: December 28, 2013, 03:40:36 pm
I have never streamed video over wifi. I can't be much help with that, but if you have any questions outside of the wifi streaming in regards to your robot I would be happy to try and help you.
40  Topics / Robotics / Re: 2 wheel vs. 4 wheel on: December 27, 2013, 03:38:32 pm
If you look at all the great robots from from RFL there were 2 and 4 wheel whiners. It depends on what you are going for. Look up Biohazard and Team Nightmare.  That will give you an example of a 4 wheel and 2 wheel robot. Personally I like 4 wheel robots.
41  Topics / Robotics / Re: Wireless Video Streaming? on: December 27, 2013, 03:35:03 pm
You can stream video but you will have to buy new parts and you will need a camera. The Arduino will have nothing to do with it . By a camera and a transmitter.

Use the Arduino for the robot... not for the video transmission. Also, what video shield did you get?
42  Using Arduino / Programming Questions / MAX6675-library on: December 27, 2013, 03:28:17 pm
How would I use two sensors with this library?  I have one temperature sensor working, but I can not figure out how to read the temperature from two sensors.  I have tested them separately and they work. Also, i'm using the proper MAX6675 chip not the other newer one.

https://github.com/adafruit/MAX6675-library

http://learn.adafruit.com/thermocouple/


Thanks!
43  Topics / Robotics / Re: advice for a newbie on: October 27, 2013, 10:00:38 pm
This would work...
https://www.sparkfun.com/products/12032
44  Community / Bar Sport / Re: Recycling Old Circuit Boards (For Profit?) on: October 03, 2013, 10:54:45 pm
I read that article as well. It was very good. It makes me even more weary from buying on ebay.
45  Community / Bar Sport / Re: US shutdown - safe mode on: October 03, 2013, 10:52:05 pm
Quote
Odd that, I don't remember my dad or two of my cousins choosing to have cancer, I wish I had asked them just to make sure.Come to think of it no one asked my son if he wanted to have a growth hormone deficiency either.

Please don't misunderstand my comment.  This was in no way an attack personally and has nothing to do with people's health, but rather who should pay for their care.    Although some people aren't  in their position (monetarily) do to any fault of their own most people made mistakes in their life that led them into the place that they can't afford health insurance, and I don't really think that I should have to pay for their care . For example, people with a  long and ongoing criminal record should not qualify for free stuff including health careā€¦. their children are another story.


Quote
Your tax money is already used for "free" health care (and has been for your entire life).

I know. I was responding to the commit that said America should restart with free health care.
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