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Servo power wiring to Netduino Plus 2

servo power; 5v; 3.3v

Best Answer Paul Newton, 07 February 2013 - 09:28 PM

Hi Ruben,

Welcome to the Forums!

 

Connection of an RC servo is quite straight forward.

 

First connect a power supply to the servo, e.g. 3 or 4 AA battery cells.

Positive to the red wire, negative (ground) to the black wire.

 

Then connect a wire from the Netduino's ground to the servo's ground (the black wire or the negative battery terminal), and finally connect a wire from one of the Netduino's PWM outputs to the white wire of the servo.

Now power up the Netduino using your favourite method - USB, barrel, etc.

 

That's it. 

 

The servo will not fry the Netduino because the white wire takes a low current digital signal, and the ground back to the Netduino just carries the same low current.

All the high currents are in the servo black and red wires connected to the batteries.

 

(I might have skipped the writing the software part.)

Have fun - Paul

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#1 rubenhak

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Posted 06 February 2013 - 09:53 PM

Hi Everybody,

 

I'm new to netduino. I've seen this topic discussed in the forum but couldn't find a good answer. So decided to ask.

 

I want to control a regular servo used in rc toys. This would be analog or digital servo with 4.8V - 6V power range.

As i understood the netduino will provide 3.3V. I'm thinking about providing the power from an external source. 

 

Can somebody help me how to do that? Would i need to connect the + wire to my external power source, then the - from the external to the ground of netduino, and the signal of the servo to one of the PWM pins? I'm bit worried about the ground. wouldn't this fry the board? If somebody can show me photos or schematics of the wiring I would really appreciate!

 

Thanks,

Ruben



#2 Paul Newton

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Posted 07 February 2013 - 09:28 PM   Best Answer

Hi Ruben,

Welcome to the Forums!

 

Connection of an RC servo is quite straight forward.

 

First connect a power supply to the servo, e.g. 3 or 4 AA battery cells.

Positive to the red wire, negative (ground) to the black wire.

 

Then connect a wire from the Netduino's ground to the servo's ground (the black wire or the negative battery terminal), and finally connect a wire from one of the Netduino's PWM outputs to the white wire of the servo.

Now power up the Netduino using your favourite method - USB, barrel, etc.

 

That's it. 

 

The servo will not fry the Netduino because the white wire takes a low current digital signal, and the ground back to the Netduino just carries the same low current.

All the high currents are in the servo black and red wires connected to the batteries.

 

(I might have skipped the writing the software part.)

Have fun - Paul



#3 rubenhak

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Posted 09 February 2013 - 06:07 PM

Thank you Paul! The external power works perfectly for the servo. It cleans up lots of servo noise.

#4 Paul Newton

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Posted 09 February 2013 - 08:31 PM

I prefer to use separate supplies for logic and motors.

My Netduino became erratic when it shared the same battery pack as my buggy's motors.

 

Paul



#5 rubenhak

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Posted 11 February 2013 - 06:54 AM

I prefer to use separate supplies for logic and motors.

My Netduino became erratic when it shared the same battery pack as my buggy's motors.

 

Paul

 

Yeah, i felt that too..







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