DC Motor Control Using Pulse Width Modulation - Engineering Assignment Help

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ASSESSMENT 2 
Task 1— DC Motor Control Using Pulse Width Modulation with C Program Interface This assessment task requires the development of the C Cde and interfaces to control the speed of a 5V permanent-magnet dc motor through the PC's parallel port (Figure 1). The circuit uses PWM (pulse-width modulation) to change the average value of the voltage to the DC motor. You connect the motor to the PC's parallel port with an interface circuit. The design comprises ICI, a 74LS244 buffer; IC2, a ULN2003 driver; relay switches SI, S2, and 53; IC3, a 555 astable multivibrator circuit and Qy a 2N2222 driving transistor. The 555 timer operates as a variable-pulse-width generator. You change the pulse width by using relays to insert or split resistors in the 555 circuit. 
 

The computer program controls these resistors. When Si is on and both 52 and S3 are off, the timer output is set to logic one, thereby driving the motor with its maximum speed. When Si and S2 are on, the 555 timer generates a pulse signal with a 50% duty cycle. In this case, the charging resistor, Rki, is equal to the discharging resistor, Rs. In the third case, Si and S3 are on, and the charging resistor is RA2,where RA2=0.1 x Rs, reducing the on time of the pulse signal and, consequently, the speed of the motor to the lower limit. Table 1 summarizes the on/off-operation conditions of the relays and the corresponding dc-motor speeds. 
The code prompts you to select a certain speed, stores your selection as an integer variable choice, generates the proper digital sequence, and stores it at another integer variable. You place the value of the integer variable data at a PC's parallel port using the outportb function. The program uses the kbhit function to stop the motor when you hit any key on the keyboard. Create all required C code, user documentation and hardware interfacing to complete the project. 
 

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