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46  Using Arduino / Project Guidance / Re: New to Arduino/Project feasibility on: September 14, 2012, 09:08:42 pm
MIght sound bad but i think the place for you to start is doing a lot of reading.

i have done quite a few arduino projects of various levels over the years and i have done one android app (not counting "hello world" stuff).

I would have to say this would not be a first project. Even with IT experience and general programming it's a big job.

Perhaps get a starter kit for arduino and work through some projects. Then get eclipse or processing and make a small android app to get your feet wet on how things are handles on the phone side.

Some reading about AVRCP.
47  Using Arduino / Project Guidance / Re: Sensing absolute height on: September 14, 2012, 08:38:17 pm
The chassis will be rolling and there will be lots of vibration (engine running and blades turning). Likely running a sort of grid pattern over a patch of ground.

Distance constraint will likely be up to 50ft or so. Height needs to be as close as possible to the set "zero reference". perhaps +/- .25"

water level sound like a very interesting idea..... will have to think about this some..... it would have to be off of the ground so it doesn't get rolled over and chopped by blades though.
48  Using Arduino / Programming Questions / Re: measure a resistor? on: September 13, 2012, 11:09:02 pm
You already have th ohms written down as 1k ohm

 smiley-eek-blue
49  Using Arduino / Project Guidance / Sensing absolute height on: September 13, 2012, 10:23:37 pm
I have a platform that's attached to a rolling chassis by linear actuators. As the chaiis moves the wheels be be on uneven terrain but i need the deck to run up and down to maintain a fixed high.

Right now i have a rotating laser on a tripod sending signals to a laser signal receiver to give me absolute level now. The receiver drives the actuator up and down to keep itself at it's specified height level.

The laser set is big money and i would like to think of a way to do this with the arduino if possible. If i do this i can also customize some features and perhaps drive a display to show me relevant information. Can anyone think of a good way to find an absolute height?

*note - ground height will change so i cannot just sense the height from the earth

I am not against keeping the tripod rotating laser and attempting to just buy the receiver side as that end is the majority of the money.   Think this may be do-able? I am not sure what type of receiver is would use for this.... would those rotators use IR? Just looking for some general ideas...... and i am sure i left out some major detail... so feel free to ask and i will try to paint as good of a picture as i can.
50  Using Arduino / Programming Questions / Re: measure a resistor? on: September 13, 2012, 09:46:41 pm
http://arduino.cc/forum/index.php/topic,21614.0.html
51  International / Français / Re: Controller TV en RS232 via Arduino MEGA on: September 10, 2012, 08:49:35 pm
try:

Code:
void setup(){
Serial1.begin(9600);
}

void loop(){
Serial1.println("POWR0   ");
delay(5000);
Serial1.println("POWR1   ");
delay(5000);
}
52  Topics / Robotics / Re: Building a Soccer Robot using Arduino and other technology on: September 10, 2012, 08:38:26 pm
How large of a "play area" will the robot be on? Essentially i am asking how high is your camera going to be mounted? :-)

Sounds like a cool little project. Is there something function you are building it for or just to learn while you build?
53  Topics / Robotics / Re: Humanoid robot servo issues on: September 09, 2012, 11:19:03 pm
In addition to the current. Building a humanoid robot means whatever servo's are at the base of its "appendages" need to have enough turning force to be able to support the weight of the appendiage which includes the weight of the servo mounted to the other joint.

ex: the shoulder need to be able to support the whole arm, including the weight of the elbow and wrist servos. With "the cheapest I could find" servos this may not be the case.
54  Topics / Robotics / Re: Building a Soccer Robot using Arduino and other technology on: September 09, 2012, 11:13:26 pm
Not sure how it is all going to come together to become a soccer robot but it looks like a cool implementation of optical recognition and a really cool little round rover bot.

Good work.
55  Using Arduino / LEDs and Multiplexing / Re: Charlieplex library on: September 09, 2012, 12:59:53 pm
Excellent! thanks very much sir.

I remember seeing this in Nick's "read before you post" in the programming section but didn't even think to look for it.

Appreciate the help.
56  Using Arduino / LEDs and Multiplexing / Re: LED clock with 780 outputs required... on: September 09, 2012, 12:58:40 pm
One heck of a first project your are starting here......

Charlieplexing might help you out. But more than likely you will be doing a lot with some shift registers and potentially transistors depending on your LED choices.

I would say a good place to start is getting an arduino starter kit and work through the examples that come with most of the kits from places like adafruit and sparkfun.

This will get a toe in the water and give you a rough idea of what it's going to take at a basic level. Good luck with your project though. I suspect it'll be a long road of learning.
57  Using Arduino / Project Guidance / Re: Light up Car Badge on: September 09, 2012, 12:50:49 pm
and that's at idle. Step on the pedal a bit and it will ramp slightly. Might still be doable.... but just didn't want it to catch you off guard.
58  Using Arduino / Programming Questions / Re: Reading integers from serial monitor on: September 09, 2012, 12:25:49 pm
pretty sure it has been discussed many times.

To recap:

atoi()
sscanf()
custom functions are all over as well
59  Using Arduino / Project Guidance / Re: Light up Car Badge on: September 09, 2012, 12:06:08 pm
Your car battery outputs between 11 and 12.5 volts when the car is not running.

In order for the alternator to charge the battery and run the electronics in the car it outputs a slightly higher voltage. So any time your engine is running, any lines that have 12V from the battery will likely read about 14 volts. Quick way to tell is with a voltmeter. Red lead to one of the bulb wires (when the bulb is on) and black lead to somewhere that has continuity to the frame of the vehicle.

Most automotive devices have a range from ~10 volts to ~16 volts for this reason.

I have not had any experience with the pro mini but i ran a Mega1280 to control some led's in my truck for a long while. I ended up using an old car power adapter that output 9Vdc and just used it as an input supply for the Mega to make sure i didn't have a heat issue on the board. Worked great until i scavenged the board for other project :-)

60  Using Arduino / Project Guidance / Re: Light up Car Badge on: September 09, 2012, 11:29:38 am
i don't have any specific information to your question. I do want to throw in that when your car is running the voltage is likely ~14.5 VDC. Just wanted to make sure you were compensating for that in your design.
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