PiFace Relay Motor Control Extra

Former Member over 10 years ago

I want use this board and PiFace Relay+ to drive a 12 V DC motor, is that possible ?

mcb1 over 10 years ago

to drive a 12 V DC motor, is that possible ?

I presume you meant this (for future adding the link means we can see what you are referring to)
PiFace Relay plus for Raspberry Pi Model B plus

As long as your 12v motor doesn't exceed 1A

The alternative for switching two relays is
http://www.element14.com/community/docs/DOC-69001

Despite the relays stating they are 10A, i suspect the pcb tracks are not sufficent.

I see that the new plus model soleves the problem of access to the GPIO pins.
I did this to mine.
http://www.element14.com/community/roadTestReviews/1452

Mark
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Former Member over 10 years ago in reply to mcb1

Thanks for your reply.I have that concern is because when I check the technical specification on http://www.element14.com/community/docs/DOC-72072/l/getting-started--piface-motor-extra-interface-board-for-raspberry-pi . The motor supply voltage is 0V - 11 V, what does it mean?
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mcb1 over 10 years ago in reply to Former Member

Oh
I see this is an addon board to the PiFace.

It provides an H Bridge and it seems that the maximum voltage is 11v.
So it will run a 12v motor at less than 12v ... which might not work.

You haven't stated what the motor current is ...

mark
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Former Member over 10 years ago in reply to mcb1

I using a dc motor with 12 V 0.1A-0.3A~
if that is the case, what motor driver which can be found in element14 would you suggest me to use?
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balearicdynamics over 10 years ago in reply to Former Member

Why don't use the PiFace motor control new version ? I have never heard of this extra but in the PDF link it seems that is a sort of part completing an old PiFace motor control board.

Take a look to the specifications of the PiFace – PiFace Digital

Enrico
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Former Member over 10 years ago in reply to Former Member

But i find that the piface digital is not integrated with H-Bridge motor controllers for me to program the motor as bidirectional. Correct me if I am wrong.Thanks.
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mcb1 over 10 years ago in reply to Former Member

It seems a very expensive way to control a motor.

Adafruit has an example here.
https://learn.adafruit.com/adafruit-raspberry-pi-lesson-9-controlling-a-dc-motor/overview

They have a board
https://www.adafruit.com/products/2348

It seems that element14 are not stocking this one.

Mark
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balearicdynamics over 10 years ago in reply to Former Member

Sorry but I focused the attention on the relays. In my vision the h-bridges can be added directly to the GPIO (a lot of pin remain free) or - to be tested , to the digital I/O of the board. Remain true what mcb1 says (below) about a less expensive solution.

Enrico
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balearicdynamics over 10 years ago in reply to mcb1

In past to control the DC motors of my primitive first mill machine I have developed a ULM2004 based h-bridges board. Sure it was supporting up to 3 A and 12 V DCC. If you need I can send you the design scheme or the project or make a PCB.
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balearicdynamics over 10 years ago in reply to mcb1

Mark, I choosen ULN 2004 / 2003 for DC motors control just for the very low price of these IC. AFAIK the adafruit board is jul 22$, anyway not so cheap respect what it can do. In the perfect Adafruit / sparkfun style

Enrico
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