Another student wants to control a DC motor from the mbed and therefore builds the circuit of Fig. 3.17B), where VS is a DC supply of appropriate value. As a further indication that the motor is running, she connects a standard LED, as seen in Fig. 3.3, directly to the port bit. She then complains of unreliable circuit behavior. Explain any necessary changes that should be made to the circuit.

Fig. 3.17B

Fig. 3.3

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(B) mbed port output DC motor ZVN4206A