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1  Using Arduino / Interfacing w/ Software on the Computer / Re: android to arduino UNO software on: July 27, 2013, 11:22:08 pm
You may be able to replace that tablet's firmware to turn it into a 'real' Android tablet.

I am sure you can find more info via Google.
2  Using Arduino / LEDs and Multiplexing / Is this an IR LED and does it work? Yes it is, yes it works and how I proved it. on: July 27, 2013, 08:24:58 pm
I am new to Arduino, electronic circuit design, and assembly. Please excuse my crude methods. Perhaps my experience will help other newbies.

I harvested some components from a PCB pulled from an optical mouse. The mouse wheel has a bunch of slots cut in it. Mounted on each side are what I assume are an IR LED and IR sensor.

I want to see if it is an IR LED and if it works. My desoldering skills are horrible and it's possible that I overheated it.

I cannot normally see IR unassisted so I took my cell phone camera and pointed it at the TV remote and pressed the volume up button. I could see flashing violet light. My cell phone camera can detect IR.

I took the LED and hooked one lead to pin 13 and the other to ground with a 270 ohm resistor in the circuit on the ground side. I loaded the 'blink' example and executed it.

I pointed the cell phone camera it the LED. No joy. Then it occurred to me that I don't know which lead is anode and which is cathode. I flipped the LED around and can see it flashing.


3  Using Arduino / Project Guidance / Re: Newbi need some help please on: December 09, 2012, 12:36:09 pm
Disclaimer! I am an Arduino newbie. I just did 'Hello World' last night. Proceed with caution!

To control the lights based on time of day I think you'll need some sort of real time clock. Perhaps you can use something like one of these:

I also found this which looks like you can get time of day without adding RTC hardware:

I suggest that you look for projects that people have done that are similar to what you are trying to do. This may be helpful:

I like Jeremy Blum's Arduino tutorials. Very newbie friendly.
4  General Category / General Discussion / Re: cost of arduino on: December 09, 2012, 11:46:34 am
I just bought my first Arduino Uno from a local Micro Center and it was $19.47 after 8.25% sales tax.

Deal Extreme carries a Chinese knockoff for $15.20
Reviews make this sound like a decent product. Shipping time is loooong with DX.

I'll probably stick with official when I buy more. I want to fund the project and the cost difference is negligible.

5  Using Arduino / Project Guidance / Re: motor speed control advice for a newbie on: November 25, 2012, 05:41:16 pm
Got it! Really looking forward to getting started with real hardware.

Will post more questions and ideas as they come up.
6  Using Arduino / Project Guidance / Re: motor speed control advice for a newbie on: November 25, 2012, 05:00:21 pm
Thank you for the feedback on PWM. Glad to know that I am headed in the right direction.

What about controlling the throttle if it exists? Would the throttle be some sort of pot or something similar? What is the best way to interface to something like that?
7  Using Arduino / Project Guidance / Re: how to connect the ps3 controller to an arduino wirelessly ? on: November 25, 2012, 01:39:31 pm
This guy did it with a processing library and a wifi sheild.
8  Using Arduino / Project Guidance / motor speed control advice for a newbie on: November 25, 2012, 01:11:13 pm
I am planning to (eventually) build an autonomous rover controlled with an Arduino. I am a total newbie to Arduino and electronics. I've been programming for many years. I expect that the hardware learning curve to be greater than the software learning curve. I don't have any hardware yet, will receive Arduino and some sort of starter kit for Christmas. Will start with learning the basics (blink the LEDs and respond to switches and sensors) and then build upon my knowledge and skills to achieve longer term project goals. I am in the dream/plan/learn stage.

An early goal for the project is to take a cheap RC car and control it with the Arduino. I've seen multiple projects like this so do not expect to have too much difficulty doing this.
I think I'll try controlling the switches in the remote first. Depending on results I may mount the Arduino on the car for more direct control or to add collision avoidance sensors.

I believe that controlling the car's direction won't be very difficult. What I'd like to do after I can control direction is control speed.

Let's assume that the car has no throttle and I am using the remote. I should be able to control the motor speed by toggling the 'go forward' switch quickly. More frequent or longer pulses == more speed. I understand that I may not get very fine control by using the remote, so that's okay initially.

Is this the right approach? Is there a better way? Is this a rudimentary form of PWM?

If the car does have a throttle then it's probably a pot or something similar (newbie here, help me with terms please) on the remote. If this is the case then I can control the throttle by changing the output of the pot, right?

If the above concepts are on track I am sure the code to do these this already exists or is pretty easy to write from scratch. I'm more interested in the viability of the concepts at this point.

Feedback please!
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