lab 5.docx - Lab 5 MENG 181(Mechanical Control programming...

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Lab # 5 MENG # 181 (Mechanical Control programming) Objectives: To control the speed of a DC fan motor using a PIC microcontroller. Apparatus: 1. PIC12F675 Microcontroller 2. PIC Programmer Hardware 3. +12VDC Power Supply 4. Electronic Breadboard 5. 2 x 1k  Resistors 6. 4 x 10k  Resistors 7. 1 x Light Emitting Diode (LED) 8. 1 x TIP41C NPN Transistor 9. 1 x 12 VDC Fan 10. 4-Pole DIP Switch 11.1 x LM7805 Voltage Regulator 12. 1 x .1uF Capacitor 13. Breadboard Wires Theory- Pulse width modulation (PWM) is a convenient way to control the speed of DC motors or the intensity of lights. Fortunately, it does not require the microcontroller to create a variable output voltage. Instead, it controls the amount of energy going to the device by outputting pulses at a fixed frequency. The longer the pulses are on, the more energy is provided to the device being controlled. Similarly, the shorter the pulses, the less energy is provided. The amount of energy transferred is given by the duty cycle. The duty cycle is the measure of the length of time the pulse is on divided by the period of the cycle – the maximum available pulse width. The dutycycle is usually given in percentage .
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