MOSFET and talking dog
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Posted by samchristy on June 28, 2007, 5:30 pm
Please log in for more thread options Hello, I have a question about a difference between controlling a motor with a MOSFET versus directly. The motor in question controls a toy dog's mouth and is part of an animatronic display. When powered, the motor opens the mouth. When power is removed the mouth shuts. The shutting is caused by a return spring. This works perfectly when I connect the motor directly to a power source such as a battery or transformer. It works fairly well when controlled from a MCU through a logic-level MOSFET. The only difference is that the mouth does not quite return to a complete shut. It does close enough for the purpose of creating a convincing effect of the mouth being shut, but I still would like to know what causes the difference. My guess is that when the mouth is fully open the spring has enough power to close the mouth completely as long as the motor is completely unpowered or in freewheel mode. It appears that the MOSFET is not turning off as quickly as when I simply disconnect power and as a result the mouth does not have enough force to completely close, though I could be way off base here. Any thoughts would be appreciated. Thanks, Sam | ||||||||||
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