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The objective of this lab is to design a point-to-point ZigBee network using the Xbee module. Each microcontroller will have a keypad and a two-line LCD display. When the operator types on the keypad, characters are displayed on one line of the LCD. When the operator hits the send key, those characters are sent and eventually displayed on the second line of the LCD of the other microcontroller. Debug the system in a bottom-up manner. Write simple main programs in the Rx and Tx systems to test the low-level functionality of the interface. Add appropriate debugging instruments, such as profiles and dumps. Connect unused pins from both devices to a single logic analyzer and record a thread profile (which program runs when) as a stream of data is passed from the Tx system to the Rx system. Write a main program to measure maximum bandwidth of your channel without using hardware flow control. Furthermore, you should determine which component limits bandwidth. Modify the transmitter so it outputs pseudo data as fast as possible. Modify the receiver so it does not display data on the LCD. Rather, the receiver will check for this pattern of characters and count the number of errors. Add minimally intrusive debugging instruments to determine if and where data is lost. Measure the maximum range of your system. In particular, find the maximum distance where the system performs reliable communication.
A DSSS-CDMA signal has a chip sequence that is 10,000 chips in length. The sequence repeats every millisecond. What is the chip rate?
What is the relationship between a unit step and a ramp signal?
The shaft output of a three-phase, 60 Hz induction motor is 100 HP. The friction and windage losses are 900 W, the stator core loss is 4200 W, and the stator copper loss is 2700 W. If the slip is 3.75%, what is the effïciency of the motor
Use the fact that x = 2 and y = 0 at t = 0 to determine the appropriate value of the arbitrary constant in the solution set.
Let a crappy voice channel occupy 1kHz. To ensure no interefence between channels due to nonideal bandpass filters add a 3.0kHz spacing between channels. How many simultaneous voice channels can you have if allocated a 87MHz bandwidth total
Assessment on Electricity and Circuit Theory, What part of a cable are insulators and conductors? Describe, in terms of charged particles, why some objects are electrically attracted to each other, while others repel each other?
The address field of the instruction (stored at W + 1) is designated by the symbol Y. The operand used during the execution of the instruction is stored at the effective address symbolized by Z. An index register contains the value X.
The teacher decides that he will not lecture unless at least k of the n students enrolled in class, are present. Each student will independently show up with probability pg if the weather is good, and with pb if the weather is bad.
Sketch the baseband signals for the two users when user 1 sends the bits 011, and user 2 sends the bits 101. Add the signals for the first bit only, and show that the output of the correlator for user 1 is -4, corresponding to a 0
Explain the operation of sequential logic devices and evaluate the output waveform in relation to the clock for QA, QB and QC in the subsequent circuit and show the binary sequence represented by these waveforms
How to Calculate the Value of Resistor for different types of LED's Circuits ?
1) When discussing the generation of electron/ hole pairs by light in semiconductors is it best to use the wave or particle rendition of light energy. 2) In what type of electron transition from valence to conduction band is momentum conserved, dir..
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