ritwik07
Posts: 1
Joined: Sun Aug 12, 2018 9:09 am

AIY Voice hat external power supply for DC motor

Sun Aug 12, 2018 9:14 am

can I connect 300 rpm motor to my voice hat and what is the max external supply that i can give to the board so that it will not cause any damage to the board.

Brandon92
Posts: 177
Joined: Wed Jul 25, 2018 9:29 pm
Location: Netherlands

Re: AIY Voice hat external power supply for DC motor

Sun Aug 12, 2018 8:17 pm

ritwik07 wrote:
Sun Aug 12, 2018 9:14 am
can I connect 300 rpm motor to my voice hat ---
Do you know on witch fuel my car is running ;). So, can you provide more information.

skspurling
Posts: 191
Joined: Fri Jul 27, 2012 1:44 pm
Location: US. Right in the middle...

Re: AIY Voice hat external power supply for DC motor

Mon Aug 13, 2018 3:20 am

So, this is something I was a bit concerned with too. The drivers on the board appear to be limited to 500ma, and the servo outputs are limited to 25ma. The thing with the servo outputs is that they are switched inside the servo, so as long as the control signal is small, it's not going to mess anything up. The motors have a simple transistor driver, from what I can tell. (my eyes are going bad, so I'm not too keen on trying to read the SMD markings) That should be what you are concerned with.

Also, you want that current to be delivered from a separate power source. Read the instructions, ( I know! Such a strange concept!) In the back (Page 61 in my copy), there are projects to use motors and servo's. They give the current limits and tell how to connect a battery pack right before the servo project. I wish the motor project talked a bit more about the details on the board, and how it all works. Maybe refer you back to the page with the current limits and stuff. I don't know about every one else, but I normally just turn to the project I am interested in, and look there, and in the index for the info.

I wish there was more info on the board. I kind of want to mod it. ;-) At $5 from Micro Center, this thing is becoming my go to audio hat...

Brandon92
Posts: 177
Joined: Wed Jul 25, 2018 9:29 pm
Location: Netherlands

Re: AIY Voice hat external power supply for DC motor

Mon Aug 13, 2018 9:21 am

If I take a look at hardware extension and the "schematic", the "Drivers" section. Than you can connect a motor* between the driver output pins 2 and 3.

* Depends how much current you motor will consume.

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