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1  Using Arduino / Motors, Mechanics, and Power / Re: Proper battery Freaduino / Servo motors on: July 26, 2014, 11:45:05 am
SpringRC SM-S4303R Continuous Rotation Servo

Freaduino UNO

I found this in Sparkfun comments for the servo:

"...120 mA at 5V for full speed unloaded. If you load it up, I got it up to about 250 mA before I decided not to break the thing."

So... 1050/120=8,75-----   8,75 hours ?
2  Using Arduino / Motors, Mechanics, and Power / Re: Proper battery Freaduino / Servo motors on: July 26, 2014, 11:37:53 am

One friend told me that Servomotors need too much energy, and maybe two connected straight to one shield would work but because their power needs the values will oscillate or start to fail.

Do you think thats wrong?



I didn´t see the picture you added. So with a 9v battery for the Arduino, and 6V battery for both Servos will be fine...

Thanks for your time!
3  Using Arduino / Motors, Mechanics, and Power / Re: Proper battery Freaduino / Servo motors on: July 26, 2014, 11:29:31 am
Thank you very much for your answer. smiley-grin

So, if i understand it right, that Pololu voltage regulator, will regulate the input voltage of the battery providing up till 3 A (more duration for the servos).

I thought the battery above would be a good one because 6V x 2 servos =12V.  But as you said, the problem is the amperage.

What about this? (Maybe 2, plus the regulator)

Again, thanks a lot.
4  Using Arduino / Motors, Mechanics, and Power / Proper battery Freaduino / Servo motors on: July 26, 2014, 09:34:24 am

I would like to be sure if this battery could be used for feeding a Freaduino UNO & two servos.

Capacity : 1050mAh
Constant discharge: 20C
Burst rate: 30C (15sec)
Configuration : 3S 11.1v
Pack size: 73x18x35mm
Weight : 100.3g
Discharge plug: XT60

The shield and servos would be working for some hours (between 1 to 4). Im looking for some small battery, because baterry holder for 8/6 alkalines  would make the robot bigger for what i need it for.

Thank you!
5  Topics / Robotics / Re: Store servo Pwm values on: March 01, 2014, 03:47:00 pm
Thank you very much Chagrin.

I guess you meant using the Eeprom Write function i could store the data gotten by sensors for then write them on the servos.
I thought i could store pwm´s pulses, do you think that it would be possible?

Anyway, thanks a lot. I will try it and post here the results of my tests.

6  Topics / Robotics / Store servo Pwm values on: February 27, 2014, 02:14:30 pm

I´m working in a project with a robot (freeduino board, 2  full rotation servomotors and two photoresistors). Basically is a light seeker.

But i´m wondering if it would be possible to print in the monitor the servo pwm values written while they are making the circuit guided for the light, for the purpose of store them after in an array and re-write them without the need of the light, so that the robot could represent again the circuit by itself.

Thanks guys
any suggestion or advice will be very very helpful.

7  Using Arduino / Motors, Mechanics, and Power / Re: Power/ Motors on: November 29, 2012, 09:26:53 am
You want to power such things directly from an external supply, which might or might not also power Vin (or barrel jack) on the Arduino.

What you really should not do is power any motors or servos from the Arduino 5V pin.

Im sorry for my bad explanation.

I know, this pin work more like an output. I already make a project with a Dc Motor with my Arduino Uno. But now i´m going to use these Dc Motor with a Mp3 Shield from Sparkfun, and maybe with a servo too, and all of that have to response to a LDR. Because of that, im wondering if its really possible power externally the Arduino Uno with so many devices like those, or the way to make it, if its possible, without smoke it.

The last time the motor circuitry was composed of a diode, a resistor and a transistor.

Thank you very much, im a totally moron in electronics.
8  Using Arduino / Motors, Mechanics, and Power / Power/ Motors on: November 28, 2012, 02:03:28 pm

I have one basic question about how much voltage needs and supplies an arduino uno.

How many devices like Dc motors or Stepmotors can i hook up to an arduino uno, wich one is externally powered, without burn it?

9  Using Arduino / Audio / Re: Play mp3 on: November 12, 2012, 06:07:32 pm
Thank you again Majenko!

But im wondering one new question... Okey, this shield gives more range to Arduino for works on other things while the first is playing the audio, but how this schema shows:
This music shield use all the grounds and the 5V pin too. It would be possible feed a motor and this shield at same time?

Thank you very much!!
10  Using Arduino / Audio / Re: Play mp3 on: November 12, 2012, 01:48:08 pm
Thanks Majenko. Do you think that i will have the same power problem using one shield like this:
11  Using Arduino / Audio / Re: Play mp3 on: November 12, 2012, 08:52:45 am

can you say to me what hardware is used here?
12  Using Arduino / Audio / Play mp3 on: November 12, 2012, 07:35:55 am
Hi, im making a class project and i need some help about playing mp3 files with arduino.

I would like play only one music track, use one sensor and one dc motor, everything on an Arduino UNO shield. I was taking a look on music shield (Seeed/Sparkfun), but im not sure if it use all of the PWM pins for his own work.

I saw this too:
Its possible work with this example using Mac?

what you recomend me?

Thank you very much
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