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Question: It is desired to change the speed of a DC motor by dynamically changing its pulse width using a potentiometer connected at bit 0 of PORTB (Figure). Note that the PWM duty cycle is controlled by the potentiometer. Write a PIC18F assembly language program that will input the potentiometer voltage via the PIC18F4321's on-chip A/D converter using interrupts, generate the PWM waveform on the CCP1 pin, and then change the speed of the motor as the potentiometer voltage is varied.
Find Equivalent resistance Rt of given circuit and also find total current flowing in circuit .Draw the circuit diagram of each step otherwise you will lose your marks. Write each step of the calculation to get maximum marks and also mention theun..
Explain how the basic strategy of control is employed in a room air conditioning system. What is the controlled variable? What is the manipulated variable? Is the system self-regulating?
The system uses a 7-cell reuse pattern. If the offered traffic per user is 0.03 Erlangs and the average number of calls per hour per user is 1.5, for an Erlang-C system with a probability of delaying a call being 5%, calculate the traffic load per..
Assume that a given transformer is 100% efficient; that is, the power being supplied by the primary side is transported without loss to the secondary side. (Transformers are not 100% efficient. One can detect this by the heat that they radiate.)
Draw a state diagram for an FSM with an input "GCNT" and the outputs "X,Y,Z". The XYZ outputs generate a sequence called a Gray Code in which exactly one of the three outputs changes from 0 to 1 or from 1 to 0.
It is desired to digitize a speech signal by sampling and quantizing the continuous time signal. Assume the highest frequency present is 4 kHz and quantization to 256 levels (8 bits) is adequate. Find the number of bits required to store 2 minutes..
The method for evaluating alternatives used in Figure 7-19 is called weighting and scoring. This method implies that the total utility of an alternative is the sum of the products of the weights and ratings of each criterion for the alternative.
A factory is to be supplied with 408Y/277 3 phase, 4 wire electrical service. The total estimated single-phase load is 25 kW, at .9 lagging power factor. The total estimated three-phase load is 250 kW at .85 lagging power factor.
Write a 68000 assembly language subroutine, ROTMEM, which rotates the elements (words-size) of an array stored at location point to by (A0). The depth of the array is stored as the first element.
Modify the scatterer to be either one-half wavelength or two wavelengths in radius; how does the scattering pattern change?
Try to decrypt the message by using keys beginning with 1 and continuing until a plaintext appears that makes sense.
What is the difference in the two demodulators in these cases? Assume the bandwidth of the message signal ωB is much, much smaller than the frequency, i.e., ωB «ωc.
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