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hamada

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    hamada
    hamada reacted to jazz in How to control DC motor with ULN2003 and msp430?   
    PWM DC Motor Control Using Timer A of the MSP430
    www.ti.com/lit/an/slaa120/slaa120.pdf
     
    I guess that LP LDO is not able to supply enough power for motor. Maybe 5V / 500 mA from USB will be enough, but to be completely sure It is better to connect motor to separate (not PC related) supply.
     
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    hamada
    hamada reacted to PigRider in How to control DC motor with ULN2003 and msp430?   
    @hamada
    your setup should work fine as far as I can tell. The datasheet from ST on page 6 says that it should be fine even with 2.4V input on the "data pin", only the output current will be lower, but it is still 200mA at 2.4V, more than enough for your led.
    Maybe you could test it without the launchpad first by just applying 3.3V or 5V to the input pin on the ULN2003. If this doesn't work, I would say, your LED or the ULN2003 is damaged. Or use a multimeter to check
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    hamada
    hamada reacted to enl in How to control DC motor with ULN2003 and msp430?   
    Presuming the diagram you attache is correct, you have the LED connected to ground. As the ULN2003 switches the other lead to ground, the LE will not light. You need the anode to f the LED attached to the 3V rail, and a current limit resistor in series with it (maybe 100ohms)
     
    Again, the outputs switch to ground, not positive supply.
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