Supply problem Arduino mega 2560+,usb host shield+ arduino motorshiekd

Other Hardware General Electronics
1

Hi users, I actually devellop a project and i'm front of a supply problem, my system is compose of:

-an external power supply 12Vdc
-arduino mega 2560
-Usb host Shield
-Arduino Motor Shield
-1Dc Motor which consume 9V,2A

the issues is the next one:
before i was able to control this dc motor thanks to a ps3 controller and now when i used the 3 arduinos cards in same time my motorshield do not delivers current on A channel. (that was working good before).

I have done a test with 9V DC motor and i add a brake on channel B which consume 9V 0.4 A

I have try to use only motor shield + arduino mega and that works

i have try to use only usb host shield+ arduino mega and i receive data from ps3 controller ( so that work)

When i use the 3 cards i can see leds on motor shield light a little bit.

I suspect a pin problem, but arduino mega is compatible with usb host shield, the connection is made by ISCP connector (equal to pin 51,52,53)

my motor shield use pin 3 (for Pulse Wight Modulation A) and pin 12 for DIR A
use pin 11 f(or pwm B )

i tried with a simple programm like it:
analogwrite( 11 ,190) ;
delay (500);

analogwrite(3,190); PWM

digitalWrite(12,HIGH);

if someone can explain me why, i will listen him really carefully.

3 cards are suppose to works together so ....

2

hi.
How are you powering your motor?I hope you are not trying to power it with 5V from USB port ...

3

i supply this thanks to a 12Vdc external power supply, when i have done the test i had limited the current to 1,5A with this alimentation. Druring this test my motor consume not more than 1A

4

What current can the 12V supply give? What's the total current consumption of
each part at each voltage - ie is the supply adequate?

5

motor consumes 0.6A with no mecanic power needed
brake of this motor consumes 0.4A, (need to be supply for be unlock)
and normaly trhis supply is adequate because i use PWM for supply to 9VDC