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1381  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



1382  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

1383  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
1384  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




1385  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

1386  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
1387  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
1388  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
1389  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

1390  Using Arduino / Project Guidance / Re: ROBOT PROJECT on: April 04, 2012, 10:15:56 am
Hi,
   The fact that it was working, then wasn't and that adding and removing devices makes it work for a short while suggests that its a power problem.

   If your using batteries, try a fresh set. If you are using large servos, motors and sheilds you will almost certainly need hobby quality batteries to take your project further.

Have a look at this -

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

and this -

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

Duane B

rcarduino.blogspot.com
1391  Using Arduino / Project Guidance / Re: How to initialise(Arm) 18 amp ESC with the help of Arduino board.... on: April 04, 2012, 03:40:19 am
Hi,

If its an air esc, you may need to are it with a 1000 microseconds input using servo.writeMicroseconds for non air escs the default servo library signal is 1500 this should do the trick if you send it for 2 seconds or so.

Why am I talking about microseconds, see here -

[urlhttp://rcarduino.blogspot.com/2012/01/how-to-read-rc-receiver-with.html][/url]

Duane B
1392  Using Arduino / General Electronics / Re: 3 servos at the same time, LEDs in series and power on: April 04, 2012, 02:43:15 am
hi,

Read these two posts on my blog -

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


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

this should answer most of your questions, come back with any you still have

Duane B

rcarduino.blogspot.com

1393  Using Arduino / Programming Questions / Re: Servo.h not behaving as i expect on: April 04, 2012, 02:26:57 am
Hi,

PCB is printed circuit board, I was not quite using a pcb but strip board which is a prototyping board that is between bread board and a proper PCB, it let's you take a bread board design and solder it as a long term project.

With regards to servo power, here is a quick demonstration of what happens to you arduino when your servos get going -

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

Duane B
1394  Using Arduino / Motors, Mechanics, and Power / Re: Giant Servo does not work properly! on: April 04, 2012, 12:40:30 am
Hi,
    Here is what your Arduino was seeing with the old batteries -

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

Duane B

rcarduino.blogspot.com
1395  Using Arduino / Project Guidance / Servos Again ! on: April 03, 2012, 03:18:29 pm
Hi,
   I have put up a new post with some video demonstrating the challenges of driving servos directly from an Arduino -

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

its a follow up to an earlier post

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

Duane B

rcarduino.blogspot.com
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