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1  Using Arduino / Microcontrollers / Re: How many Arduino boards does my project need? on: December 04, 2012, 08:52:59 pm
Thanks for the advice! Any links for where I could find such an "all-in-one" device.

Here's my concern: all of the examples I've seen for merging wired Ethernet and WiFi over the same Arduino board all involve hacking a TP-Link router and connecting it to Arduino. I'd like to implement a solution that doesn't violate an license agreements.

Can you (or anybody else) confirm that a single Arduino board can connect to both an Ethernet and a WiFi shield, or do I have to buy 2 Arduino boards, and cannot 1 shield to each?
2  Using Arduino / Microcontrollers / Re: How many Arduino boards does my project need? on: December 04, 2012, 08:09:07 pm
One other option, perhaps, would be for me to solder/add a cat-5 ethernet port to the controller, instead of adding an additional Ethernet shield. Is this possible?
3  Using Arduino / Microcontrollers / How many Arduino boards does my project need? on: December 04, 2012, 07:48:25 pm
I want to build an Arduino-based device that accepts both wired Ethernet and WiFi TCP/IP connections. Which of the following do I need to buy:

  • Just the Arduino WiFi Shield (1 item)
  • Arduino WiFi Shield and the Ethernet Shield (2 items)
  • Arduino, the WiFi Shield and the Ethernet Shield (3 items)
  • Some other combination of boards/shields?

And, if I do need to buy a base Arduino board and then 1+ Shields for it, is there a specific model of Arduino that should be used (or that is preferred)? Thanks in advance.
4  Using Arduino / General Electronics / How to calculate torque rating for motors? on: December 04, 2012, 06:45:33 pm
I am a programmer and am just getting into robotics/electronics. I would like to build an Arduino-based robot that I can control from an app on my Android phone. I am planning on the robot having 4 motors (actuators?) controlling 4 wheels (1 tank tread/belt on each side; 2 wheels per tread/belt).

I am trying to determine how "heavy duty" my motors need to be, and not sure where to start in my calculations. Here's some constraints/preferences:

  • Speed is not critical, maybe top-speed of ~2mph
  • It's tough telling how heavy the robot will be at the outset, but probably no more than 3 - 5lbs
  • Looking for lowest power consumption possible (given the above constraints) to provide max battery life
  • I'd prefer < $20/motor

After a cursory review of several websites, it looks like motors are measured by the following properties:

  • Voltage
  • RPM
  • Torque
  • Reduction

So we have a ~4lb robot distributing that loads over 4 motor-actuators with a desired top-speed ~2mph. I'd like the motors to meet those capabilities as well as run on as little power as possible, all within the $10 - $15 per motor price range.

I'm not asking for other members to make suggestions on particular models ("give a man a fish"), what I'm asking is what calculations most robot hobbyists would use in this scenario to take all these factors into account and make an educated guess on what type of motor I need ("teach a man to fish"). So, where do I start?!? Thanks in advance.
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