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I want to interface 12 dc motor with Raspberry pi 2. I tried by switching the transistor for forwarding and stopping the motor.How can i do it by doing with L293d ic.By giving 12v in L293d vcc2 pin does it affect my pi.please help me in solving the issue.

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The Raspberry Pi pins only outputs 3.3V or 5V. If you need to control a 12V device you need to plug it to another power supply (or a power suply with different outputs for 5v and 12v as a standard PC power supply). Then you can control GPIO with WiringPi.

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