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Shield Motor Adafruit V2 - V2.3
Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.

Shield Motor Adafruit V2 - V2.3

by Atmos_ on Mon Mar 08, 2021 8:46 am

Hello,

I have a Shield V2-V2.3 on my Rover which worked very well,
but the H-bridge to burn.

It manages 4 12V motors.

I ordered another one, but my question is, why does it burn?
In order to understand why.

Thank you

------------------------------------------------------------
Bonjour,

Je possède sur mon Rover un Shield V2-V2.3 qui fonctionnait très bien,
mais le pont en H à bruler.

Il gère 4 moteurs 12V.

J'en ai commandé un autre, mais ma question est, pour quel raison à t-il bruler ?
Afin de comprendre pourquoi.

Merci
----------------------------------------------

Atmos_
 
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Re: Shield Motor Adafruit V2 - V2.3

by adafruit_support_bill on Mon Mar 08, 2021 9:40 am

Please post some electrical specs for the motors you are using.

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Joined: Sat Feb 07, 2009 10:11 am

Re: Shield Motor Adafruit V2 - V2.3

by Atmos_ on Mon Mar 08, 2021 12:46 pm

Modelcraft RB350050-0A101R Moteur à entraînement 12 V 1:50
Tension nominale 12 V
Courant de charge max. 2,1 A
Démultiplication (détails) 50:1
Alim. 12 V
Couple (crête) 90 Ncm
Régime à vide en tension nominale 120 tr/min
Vitesse en charge 104 tr/min

Atmos_
 
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Re: Shield Motor Adafruit V2 - V2.3

by adafruit_support_bill on Mon Mar 08, 2021 1:04 pm

Tension nominale 12 V
Courant de charge max. 2,1 A

The motor shield is rated for 1.2A continuous. It can handle very brief spikes up to 3A. But only for a couple of milliseconds - such as during startup. Exceeding 1.2A for a longer period of time will eventually result in permanent damage to the chip.

You could try using a lower voltage source. For example, 7.2v battery pack would lower the maximum current to just over 1.2A. Of course, the maximum speed and torque would also be proportionally lower.

To get maximum performance from the motors, you would need motor drivers capable of higher currents. For example we have the DRV8871: https://www.adafruit.com/product/3190
You can also check with www.pololu.com. They carry a much wider selection of high-current motor drivers.

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Re: Shield Motor Adafruit V2 - V2.3

by Atmos_ on Mon Mar 08, 2021 1:11 pm

Thank you very much,
I will immediately order this model.
I am not yet very aware.
Thank you for your super fast response.
Next time, I'll ask you first.
Greetings.
Bertrand

Atmos_
 
Posts: 7
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Re: Shield Motor Adafruit V2 - V2.3

by Atmos_ on Thu Mar 11, 2021 2:35 pm

Bonjour,
J'ai reçu deux Adafruit DRV8871 Brushed DC Motor Driver Breakout, comme vous me l'aviez conseillé.
Mais j'ai quelque soucis et je n'arrive pas à saisir.
Avec le code proposé (qui n'est pas très complexe), en branchant deux moteurs l'un fonctionne M1 juste en fonction du code l'autre M2 tourne tout seul !!!

Auriez-vous un code plus complexes (Avant, Arrière, Stop) pour quatre moteurs ?

Merci

Hello,
I received two Adafruit DRV8871 Brushed DC Motor Driver Breakouts, as you advised me.
But I have some concerns and I can not understand.
With the proposed code (which is not very complex), by connecting two motors one works M1 just according to the code the other M2 turns on its own !!!

Would you have a more complex code (Forward, Reverse, Stop) for four engines?

Thank you

Atmos_
 
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Re: Shield Motor Adafruit V2 - V2.3

by adafruit_support_bill on Thu Mar 11, 2021 2:44 pm

The DRV8871 has a single H-Bridge. So you can control one motor per board. The code required for multiple boards and motors will depend on what pins you are using to connect them.

Please post a photo or diagram of how you have everything connected.

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Re: Shield Motor Adafruit V2 - V2.3

by Atmos_ on Thu Mar 11, 2021 3:57 pm

If I understood correctly, I need four DRV8871s to drive four motors, plugging each motor into M1? or two DRV8871 with two motors in parallel on M1?
So what is M2 used for?
In the photo, one motor is just running, the other is still running !!!
I have already used all the Adafruit shields and it was not like that ...
Greetings

Si j'ai bien compris, il me faut quatre DRV8871 pour piloter quatre moteurs, en branchant chaque moteur sur M1 ? ou deux DRV8871 avec deux moteurs en parrallèle sur M1 ?
Alors à quoi sert M2 ?
Sur la photo, un moteur fonctionne juste, l'autre tourne toujours !!!
J'ai déjà utiliser tous les shield Adafruit et ce n'etait pas comme ça ...
Salutations

Atmos_
 
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Re: Shield Motor Adafruit V2 - V2.3

by adafruit_support_bill on Thu Mar 11, 2021 4:17 pm

So what is M2 used for?

Please refer to the Pinouts section of the guide. There is only one set of motor output pins. The two leads of the motor connect to the two pins of the motor terminal.
https://learn.adafruit.com/adafruit-drv ... -1839140-8

In the photo, one motor is just running, the other is still running !!!

Not sure which photo you are referring to. But in the Usage section of the guide you can see that there is only one motor connected: https://learn.adafruit.com/adafruit-drv ... kout/usage

I have already used all the Adafruit shields and it was not like that ...

The motor shields have 4 full H-bridges (on 2 dual H-bridge chips). However, they are relatively low-powered ones and do not have current limiting. So they not suited for driving larger motors. I am not aware of any boards that incorporate 4 high-powered drivers on a single board. www.pololu.com does have some 2-channel high-power motor controller boards.

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Re: Shield Motor Adafruit V2 - V2.3

by Atmos_ on Thu Mar 11, 2021 4:41 pm

Oui, merci, je crois que j'ai compris.
Le deuxième pad est pour l'alimentation et pas pour un moteur.
J'avais en tête les Adafruit V2 avec 4 moteurs, et les L298L avec deux moteurs.

Je vais donc essayer avec 4 * 1 DRV8871, un par moteur.

Vous confirmer ?

Salutations.

Bertrand

Yes, thank you, I think I understood.
The second pad is for power and not for a motor.
I had in mind the Adafruit V2 with 4 engines, and the L298L with two engines.

So I will try with 4 * 1 DRV8871, one per engine.

Confirm you?

Greetings.

Bertrand

Atmos_
 
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Re: Shield Motor Adafruit V2 - V2.3

by adafruit_support_bill on Thu Mar 11, 2021 5:02 pm

Yes. The L298 is another 2-bridge driver that does have higher current capability than the TB6612 drivers on the shield. But like the TB6612, it does not have current limiting. The DRV8871 handles the higher currents and has limiting also to prevent damage.

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Re: Shield Motor Adafruit V2 - V2.3

by Atmos_ on Thu Mar 11, 2021 5:53 pm

I learned a few things.
Thank you

Bertrand

Atmos_
 
Posts: 7
Joined: Mon Mar 08, 2021 8:22 am

Please be positive and constructive with your questions and comments.