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5307 Views 1 Reply Latest reply: Apr 21, 2014 11:34 AM by MikeWeed RSS
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Apr 21, 2014 10:43 AM

RF receiver and motor issue



I just purchased a simple RF M4 Receiver 315 MHz momentary device: along with the remote.



I have a small 5V DC motor connected to one of the 4 data pins.  However, when I activate the pin (output high), I get the correct 5V, but the output isn't turning on the motor.  Any thoughts of why?

  • MikeWeed Apprentice 57 posts since
    Oct 21, 2011
    Currently Being Moderated
    Apr 21, 2014 11:34 AM (in response to Riley)
    RF receiver and motor issue

    According to the PT2272 data sheet at the decoder outputs can drive only a few milliamps. You need a simple driver, like a 2N7000. Connect the data output to the gate of the 2N7000, the 2N7000 source to ground, and its drain to the motor negative lead. The motor positive lead goes to +5V. If the motor draws more than about 1 amp the 2N7000 will burn up, so use a FET with a higher drain current rating. It is a good idea to put a diode like a 1N4007 across the motor, with the diode cathode connected to +5V. This will supress voltage spikes that might be generated by the motor's inductance, which could damage the FET.

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