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1381  Using Arduino / Project Guidance / Re: How to make a rc radio with arduino and a 2.4Ghz RX and TX module..?? on: April 06, 2012, 01:47:07 pm
or, don't take anything apart, don't reinvent the wheel and just do it this way -

http://rcarduino.blogspot.com/2012/01/how-to-read-rc-receiver-with_25.html

Duane B

rcarduino.blogspot.com
1382  Community / Bar Sport / Re: Laws of the Forum on: April 06, 2012, 07:30:12 am
Everything in Arduino can have at least one viable answer apart from - is Arduino object orientated ?

Duane B
1383  Using Arduino / Programming Questions / Re: Program works only with USB and not direct connection on: April 06, 2012, 04:47:37 am
Hi,


Read this

http://rcarduino.blogspot.com/2012/04/servo-problems-with-arduino-part-1.html

Then watch this

http://rcarduino.blogspot.com/2012/04/servo-problems-part-2-demonstration.html

Then get the batteries.

If there is anything that you don't understand, I would be interested to know what it is, I think I have everything covered, but maybe not.

Duane B

rcarduino.blogspot.com
1384  Using Arduino / Programming Questions / Re: Visual examples on: April 06, 2012, 12:36:16 am
Hi,

I think this is a nice reference to have around, its the guide that oomlout supply with thier Arduino kits -

http://oomlout.com/products/ARDX/ARDX-experimenters-guide-WEB.pdf

Duane B

rcarduino.blogspot.com
1385  Using Arduino / Project Guidance / Re: Sensor Shiled V4 (Electronic Brick Shield V4) - problem on: April 05, 2012, 04:04:18 am
Hi,
   Let us know if the power circuit resolves your problem, I think it will, your external power is still limited by the Arduino onboard regulator and may not have such a high current capacity in the first place.

Duane B
1386  Community / Bar Sport / Re: Laws of the Forum on: April 05, 2012, 03:52:39 am
The investment on day one is inversely proportional to the chance of the project ever getting finished.

ie.

I bought ten servos XYZ sensors, a Mega and four brushless speed controllers. I need help getting my project to work.


1387  Using Arduino / Sensors / Re: infrared light sensor on: April 05, 2012, 03:38:23 am
Hi,
   Your recommending a sensor that you cant get to work ?

   You can buy very low cost emitters and detectors, to detect black you want to emitter and detector, to detect ambient, you dont need the emitter.

see here for one example -

http://proto-pic.co.uk/infrared-emitters-and-detectors-pair/

Duane B

rcarduino.blogspot.com



1388  Using Arduino / Project Guidance / Re: Sensor Shiled V4 (Electronic Brick Shield V4) - problem on: April 05, 2012, 03:15:51 am
Hi,
   This is probably a power problem,

see here and here for why and how to fix it -

http://rcarduino.blogspot.com/2012/04/servo-problems-part-2-demonstration.html

and how to fix it -

http://rcarduino.blogspot.com/2012/04/servo-problems-with-arduino-part-1.html

Duane B

rcarduino.blogspot.com

1389  Using Arduino / Motors, Mechanics, and Power / Re: Arduino Motor Control on: April 05, 2012, 01:14:32 am
Hi,
   Its likely that you circuit does not have enough power, watch this, its what is happening to your Arduino -

http://rcarduino.blogspot.com/2012/04/servo-problems-part-2-demonstration.html

This will also give you some background, it applies to servos but the approach to power is just as relevant to motors -

http://rcarduino.blogspot.com/2012/04/servo-problems-with-arduino-part-1.html

Duane B

rcarduino.blogspot.com
1390  Using Arduino / Motors, Mechanics, and Power / Re: Using servos with ardumoto on: April 04, 2012, 01:16:09 pm
Hi,
   Not really. I assume the 7.4V batteries are NIMH or LIPO, if so its a really good starting point, what is the mah rating its usually a number in the 1000's written all over the battery ?

In an ideal situation you would have two circuits, one is the 5V logic circuit, the other is a power circuit which in the case of servos can be 4.8 to 6 volts - don't try and power the Servos directly from the 7.4 it could damage them.

Looking at the Ardumotor, it takes the motor power from the VIN of the Arduino, this is before the Arduino on board regulator so is not current limited by the regulator. The Ardumotor take logic power for the onboard circuits from the Arduino 5V, this is after the regulator so not going to deliver the amps you need for the Servos.

The voltage coming from vin will be too high for the servos so dont use this directly.

One quick solution is to pick up a regulator of the type used in RC Models, these are able to deliver 5 or 6 volts from a 7.4 volt battery and will also give you 2 amps or more for your servos.

This will allow you to use a single high capacity NIMH or LIPO to drive your project, connect the servos to the battery through the regulator suggested above and keep everything else as you currently have it.



Duane B

rcarduino.blogspot.com




1391  Community / Bar Sport / Re: Laws of the Forum on: April 04, 2012, 11:45:11 am
On the positive side, many members strike a commendable balance between giving the answer and giving the information to find the answer. In the short time that I have been around the forum I have never seen it formalised anywhere, it just seems to be the spirit of the forum, its great, keep it up.

Duane B

1392  Using Arduino / Project Guidance / Re: 2-way radio control/telemetry... feasible? on: April 04, 2012, 11:41:43 am
Thanks,
    I really need to settle down and just work on the LapTimer and the Traction control. I was waiting for some components but have then now so no more excuses - apart from being in Lebanon and my kit is all in Dubai.

Duane B

rcarduino.blogspot.com
1393  Community / Bar Sport / Re: Laws of the Forum on: April 04, 2012, 11:37:20 am
This made me smile -

Quote
Sometimes, even after I have typed a clever and technically accurate response, it is better to abort my posting and pretend you never saw the question.

Duane B
1394  Using Arduino / Motors, Mechanics, and Power / Re: Using servos with ardumoto on: April 04, 2012, 11:29:45 am
Hi,
    Its better to use a dedicated power source for your Arduino (as you are) and another dedicated power source for any power hungery devices such as motors and servos.

    In some recent test I ran, the Arduino drew 10mA current whereas a single servo could draw upto 1.5 Amps at stall.

    See here -

http://rcarduino.blogspot.com/2012/04/servo-problems-with-arduino-part-1.html

and

http://rcarduino.blogspot.com/2012/04/servo-problems-part-2-demonstration.html

Notice the effect that the servos have on the quality of power, its best not to have that running through your Arduino.

Duane B

rcarduino.blogspot.com
1395  Using Arduino / Project Guidance / Re: 2-way radio control/telemetry... feasible? on: April 04, 2012, 11:24:12 am
Hi,
   I recently bought my first 2.4Ghz radio, its a Spectrum DX3S three channel ground radio. It includes a telemetry channel from the car, the default uses are temperature and RPM, I would expect that the higher end radios also include this telemetry feature and may even support multiple telemetery channels.

Not sure if that helps or if your dead set on building something from scratch ?

Duane B

rcarduino.blogspot.com

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