Strangeness with Serial and pololu

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hi -

i'm using pololu servo controller via serial - have pin #1 (tx) on arduino connected "logic-level serial input" pin #3 on pololu. power , gnd wired okay, i'm using 3 servos - works.

sort of.

if power arduino, , connect terminal (can see text equivalent of commands sent pololu) works great. can quit terminal app, unplug usb cable, , servos continue work fine.

but if don't hook terminal app, doesn't work. in other words, if power board no usb or terminal app, servos don't move - there polulo doesn't (?). terminal app connected, servos start turning (and app can killed , usb unplugged).

i can't figure out heck going on.

can shed light? seems act of connecting terminal somehow "makes work".

cheers, , thanks.

b...

how powering setup when not connected usb port?


Arduino Forum > Forum 2005-2010 (read only) > Software > Interfacing > Strangeness with Serial and pololu


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