Hi,
I have recently bought a motor shield and I have a question:
When I connect a battery to the vin pin is the voltage of my battery going to be supplied to the motors?
for example a 7 volt battery, do the motors get 7 volts?
thanks in advance.
Motor shields should have a separate motor power connection, independent of
any Arduino power. But which motor shield are we talking about?
The arduino motor shield, I have to motors connected but they are rated as 5v one of them and 3v the other, I also have a 7,2 volt battery connected to vin pin, how can I have them both working without damaging them?
Ah, that one is an exception - not great as the board won't work above 12V!
Connect the motor supply to the screw terminals on the motor shield marked Vin and Gnd,
make sure the voltage is between 7 and 12V max.
The L298 on that board loses 2.5V or more, I wouldn't worry about your motors!
To quote the Arduino Motor Shield page:
To avoid possible damage to the Arduino board on which the shield is mounted, we reccomend using an external power supply that provides a voltage between 7 and 12V. If your motor require more than 9V we recommend that you separate the power lines of the shield and the Arduino board on which the shield is mounted. This is possible by cutting the "Vin Connect" jumper placed on the back side of the shield. The absolute limit for the Vin at the screw terminals is 18V.
No idea where that 18V limit comes from, the schematic shows 35V capacitors on the supply and
40V flyback diodes and the L298 is rated abs max 46V....
pedroply:
...
for example a 7 volt battery, do the motors get 7 volts?
...
It will be true if use superconductor, but you are in semiconductor forum. 8)
Thanks for replying I have replaced the 3 volt motor by a servo because it is better for the job (steering).