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Topic: 4 servos, 1 LiPo (Read 142 times) previous topic - next topic

FilipS

Jul 19, 2018, 10:36 am Last Edit: Jul 19, 2018, 10:47 am by FilipS
Hi everyone,

I'm making a flying project which involves an Arduino and 4 servos. It has to fly, so the less it weighs, the better. I have been warned that I should not power my main board and the motors from the same power supply. But, again, I need to save weight and two batteries is a lot. I don't require the system to work for more than 5 minutes on a single charge. So my question is:

Can I use a single LiPo battery (7.4 V, 220mAh, 30C (6.6A) ), to power my Arduino micro and 4 little servos (maximum drain 800 mA) without destabilising the current much? The motors are powered through a step-up step-down converter, reducing the voltage to 5V.

septillion

Yes, is fine. But you might need to add extra decoupling for the Arduino.

But a step down transformer will not work (on DC). So I hope you mean step down converter ;)
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FilipS

Thanks for a very quick reply, I meant converter (I am still new to electronics).

Could you please specify what you mean by saying

Quote
But you might need to add extra decoupling for the Arduino.
What is decoupling?

septillion

Add capacity to the 5V line of the Arduino like 470uF or so. To be sure the power to the Arduino does not drop (to much) when the servo's work.

If it still resets you could power the Arduino Vin via a diode and add a cap after the diode. Because of the diode the servo's can't drain that cap that way.
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I want x => I would like x, I need help => I would like help, Need fast => Go and pay someone to do the job...

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slipstick

Sometimes you talk about servos and sometimes you say motors. Are they the same thing or are there both servos AND some motors that you haven't told us anything about? Because you don't seem to have anything that will power a flying thing...unless of course it is a glider.

Steve




FilipS

By saying motors I meant servos (I tried to avoid repetition, habits from school)

The model itself is a small scale Falcon 9ish - New Glennish model rocket.

vinceherman

Are you making a guided missile?  Because it sounds like you are making a guided missile.

That is firmly in the "Do not do this under any circumstance" territory.

FilipS

#7
Jul 19, 2018, 10:52 pm Last Edit: Jul 19, 2018, 11:01 pm by FilipS
I understand your concerns. I am not making a weapon. My goal is not to hit a target with this rocket, but to fly it up into the air and then land it in a controllable and safe manner inspired by the one presented by Blue Origin with the New Glenn.

The model doesn't have any warhead or explosives built in

I am not going to use a big rocket motors and they're very hard to come by in Europe. It will fly on four C6-5 hobby motors. The rocket itself is too heavy to fly above 300 meters on the ones I can get.

I fly my models legally, respecting our local law (in my case Polish).

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