Arduino Nano and SN754410 H-Bridge

Hi all,

Newbie here, trying to connect my Nano to the Tamiya dual gearbox via a SN754410. Trying to follow the tutorial here: http://itp.nyu.edu/physcomp/Labs/DCMotorControl, see attached image, I disconnected the two wires to the motor, but is there something I’m doing wrong?? I ask because I’m pretty sure I TRASHED my Arduino while trying this. :confused: Any help would be so greatly appreciated. The switch is off the image a bit to the top right.

Someone help me not destroy another Arduino! :Op