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Topic: Need Advice on MotorShield - Shoot your suggestions!!!! (Read 1 time) previous topic - next topic

rshnk90


Hi there,

I'm going to build bluetooth powered device that deals with motors. Not a single motor, But 3 Motors in diff volts.


1.) 12v DC gear motor 2RPM

2.) 6v DC gear motor 30RPM

3.) 6v DC gear motor 6RPM

Total: 3 Motors.


I'm thinking... to use Arduino UNO or Pro-mini to control these motors for directions and speed.


So, Let me jump straight to the question...

Question #1: -

What motor shield is best to power the above motors ? Is there a single motor-shield or do I need to use multiple ? I need a shield that is possible for the arduino to control the speed and direction of these 3 motors.

Question #2: -

I know, Powering these motors are not possible by Arduino. So, What volt of battery should I buy to power the following list of items below...

1.) 1 x 12v DC motor
2.) 2 x 6v DC motors
3.) Arduino UNO or Pro-mini
4.) HC-05 Bluetooth Module


I'm not really a big fan of using multiple power supplies.  So, if there a solution to use single power supply to power all these what is best ? can you link me ? Or if there is no way other than using multiple power supply. What would be your best suggestion ?

I'm investing some serious money onto this project, Kindly help me with some serious thoughts though.

I'll be so grateful and appreciate your help throughout.

looking forward. thanks.




rshnk90


rshnk90


Hi there,

I'm investing to build a project at home with some arduino knowledge, But im not sure about the batteries. What volt battery should I buy to power the following list of items below...


1.) 12v DC gear motor 2RPM - not sure

2.) 6v DC gear motor 30RPM  - 120ma

3.) 6v DC gear motor 30RPM  - 120ma

4.) Arduino UNO or Promini

5.) HC-05 Bluetooth Module.


Does 11.1v lipo battery be good to power all the above ? I'm looking for a single power source to do all the work rather than separate sources. please advice.

couka

For controlling speed and direction, you need an h-bridge per motor. Which one is suitable depends on the current.

For the voltage supply I would either use a 12V supply + step-down converter to 6V or a 6V supply + step-up to 12V.

lg, couka
youtube.com/DieBastler1234
Don't send me technical questions via PM. They will be deleted unanswered.

rshnk90

Thanks Couka,

The H-Bridge Dual is what I'm having right now. It has slots to connect up to 2 motors. what about the 3rd motor ? Do I need another shield and use it ?


Quote
voltage supply I would either use a 12V supply + step-down converter to 6V or a 6V supply + step-up to 12V.
Sorry, excuse me. I don't get that part...

Do you mean.. to use 12v supply and use a step-down converter to 6v only to power arduino and 6v motors ? While the other motoer and H-Bridge connects to raw 12v supply ?

Wawa

No motor drivers?
They (the wrong ones) might also drop some voltage.
A 3C LiPo seems good, if you have a dedicated balance charger for that.
If weight/size is not important, an easier to charge small lead/acid battery might do.
You can drop the voltage to 6volt almost lossless with a stepdown/buck converter.
The HC-05 module on a carrier board has it's own onboard 5v to 3.3v regulator.
Post links/datasheets and a description of your project if you want better advice.
Leo..

rshnk90

Thanks wawa!

Sorry, I forgot to mention the Dual H-bridge motor-shield which I will be using to control these motors via arduino. I don't have a datasheet at the moment, But soon will be making one.

I'm just shopping the parts at the moment...

Do you think it is best to use a 6V DC motor of same 2RPM ? I just found that it is available at store.
So making all 3 motors at 6V. Do you think the volt will affect the torque ? Im confused here.

I'm making a RC controlled kinda truck with some additional functions that uses additional motor.


Wawa

All motors of the same voltage seems less complicated.
A motor of the same size/model should have the same torque.
Half the voltage is twice the current (same power).
Leo..

rshnk90

Quote
Half the voltage is twice the current (same power).
Does this affect the H-Bridge Driver ? Cause I read somewhere that it has a certain max amp power.
Since I'm running 3 motors would that be a problem ?

Do you think.. switching all motors to 12V of same size/model with less current is best or 6V with more current is ?

If 12V of same size/model is advisable, then powering up these 3 motors with 11.1v Lippo Battery is good ?

PS: I will be using a step-down buck to 6V for the arduino from this battery supply as well.

Sorry for too many questions, Is this good to go ?

Coding Badly


couka

Sorry for too many questions, Is this good to go ?
Since you didn't tell us what the motors should do, it's hard to say if a solution is good enough.

At 11.1v the motors will turn a bit slower and have not at much torque as at 12v. But if you power them directly from a battery, you can't avoid changes in the voltage, anyway.

So more information about your project -> better suggestions.

lg, couka
youtube.com/DieBastler1234
Don't send me technical questions via PM. They will be deleted unanswered.

raschemmel

I haven't seen any replies addressing the fact that the OP plans to power the UNO (or Pro-Mini) from the same battery powering all the motors. I do see an issue there with the motor noise generated and it's effect on the uP. Motor spikes on the UNO regulator input could result in errors or resets unless you add some substantial filter caps (470 uF or greater).
Arduino UNOs, Pro-Minis, ATMega328, ATtiny85, LCDs, MCP4162, keypads,<br />DS18B20s,74c922,nRF24L01, RS232, SD card, RC fixed wing, quadcopter

rshnk90

Update: Since my motor-shield driver has only 2 connections to connect a maximum of 2 motors. Im going to use only 2 Motors. So, I guess I will be going with 12V each for both the motors.

12V 2RPM DC Motor  +  12V 300RPM DC Motor
Both have extended gear box for high torque.



Quote
Since you didn't tell us what the motors should do, it's hard to say if a solution is good enough.
Thank you for taking the time to reply, Couka. Appreciate it.

As mentioned earlier in the above post, I'm building a RC truck with some functions that carrys objects and run forward and turns. Similar to a crane. For these, I planned to use 2 different motors. 2RPM for high torque to lift and other 1 for movements.


When I searched online for 12V lipo..that time i was only able to get 11.1v and the seller told me at peak charge it will supply 12v.

But later I found a 12v power supply here :
http://www.ebay.com/itm/High-Power-12V-Rechargeable-Li-po-Battery-for-CCTV-Cam-6800mAh-Useful-/301776949619?hash=item46434ed173:g:OisAAOSw14xWKcWn


Will that be suitable ?


Quote
I haven't seen any replies addressing the fact that the OP plans to power the UNO (or Pro-Mini) from the same battery powering all the motors. I do see an issue there with the motor noise generated and it's effect on the uP. Motor spikes on the UNO regulator input could result in errors or resets unless you add some substantial filter caps (470 uF or greater).
Thanks for taking the time to reply, Raschemmel. Appreciate it.

The motors will be driven by a dual H-Bridge motor-shield via arduino and
I planned to use a step-down buck that converts the 12v to 6v to powerup the uno or pro-mini. But I didn't know the spikes will affect the board. So, Do I need to add a 470 or 570uf ? Please advice.




Updated Part List:

1.) 12V DC Motor x 2

2.) H-Bridge Motor Shield
 
3.) 12V Lipo battery

4.) 12V to 6V Step-Down Buck for powering arduino..etc.

5.) Arduino UNO or Pro-mini ( obviously )

6.) HC-05 Bluetooth Module


raschemmel

Arduino UNOs, Pro-Minis, ATMega328, ATtiny85, LCDs, MCP4162, keypads,<br />DS18B20s,74c922,nRF24L01, RS232, SD card, RC fixed wing, quadcopter

rshnk90

Quote
Don't know.
Wait and see what happens.
Sorry mate, I'm no way have any experience in this. That's why I'm seeking some advices from experts like you. Hope you could lead me to a better path with this project.


I have updated my post above with links to the parts that i will be using.

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