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Author Topic: Motor Shield on Ethernet Shield on Mega 2560  (Read 521 times)
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El Segundo
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I have the motor shield on top of the ethernet shield on the Mega 2560, All purchased form adafruit.

Two questions:
1) Will stacking shields potentially cause any problems? And if so, how do I fix them.

2) How do I connect an external power supply to the motor shield? Will whatever supply I hook up, also be the voltage that the motors will receive?  I am using four of these small 4.5-9V hobby motors (https://www.adafruit.com/products/711)
Do I just cut off the end of the 9V power supplies and hook them up? How do I determine which one is ground? (novice question, sorry)

I appreciate any insight
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Shannon Member
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I have the motor shield on top of the ethernet shield on the Mega 2560, All purchased form adafruit.

Two questions:
1) Will stacking shields potentially cause any problems? And if so, how do I fix them.
That all depends which pins they use - you need to look at the pin usage of every shield.  Some shields allow the pinout to be changed with jumpers which can help - however it is your responsibility to check for compatibility in pinouts - shields should have clear documentation about which pins they use.

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2) How do I connect an external power supply to the motor shield? Will whatever supply I hook up, also be the voltage that the motors will receive?  I am using four of these small 4.5-9V hobby motors (https://www.adafruit.com/products/711)
Do I just cut off the end of the 9V power supplies and hook them up? How do I determine which one is ground? (novice question, sorry)

I appreciate any insight
The motor shield should have screw terminals for its supply (yes that is for the motors), and terminals for the motor(s).  The polarity of the supply terminals should be marked clearly (its very bad form if not) - ah yes, it has "+M" and "GND" marked.

What do you mean by "cut the end of the 9V power supplies", and what power supplies are you planning to use?
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El Segundo
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Hi Mark,

Thank you for the response.

Regarding power:
I would like to use this -9 VDC 1000mA regulated switching power adapter from adafruit (https://www.adafruit.com/products/63). Would that work?

Thanks
-Simon
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You mean "9 VDC" not "-9 VDC" I presume - the sign is only meaningful when you have several supply voltages with a common ground.  That should be reasonable, can take the stall current if needed. If the wires are both black you will need to check the polarity with a multimeter.
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El Segundo
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Yes, thank you.
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