# Experiment 5.A. Basic Wireless Control. ECEN 2270 Electronics Design Laboratory 1

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1 .A Basic Wireless Control ECEN 2270 Electronics Design Laboratory 1

2 Procedures 5.A.0 5.A.1 5.A.2 5.A.3 5.A.4 5.A.5 5.A.6 Turn in your pre lab before doing anything else. Receiver design band pass filter Receiver design peak detector Receiver build and test Transmitter design modulator Transmitter build and test Communication test ECEN 2270 Electronics Design Laboratory 2

3 Lab 5: Part A.1 Familiarize yourself with the wireless receiver and transmitter included in your lab kit Read through the information on the RF modules, found on the materials page of the lab website. Make sure that you understand how the RF modules are supposed to be connected and used. How are the modules connected and how do they interact with each other? What are the inputs and outputs for each module? In your lab report, include a paragraph or two describing the modules and how they work. Electronics Design Laboratory 3

5 A.1 Receiver design band pass filter Adjust the values to match your design! Electronics Design Laboratory 5

9 A.4 Transmitter design modulator This part of the lab will deal with building the transmitter portion of your wireless communication circuit. Begin by designing a 555 timer in LTSpice to generate an approximately 50% duty cycle square wave at f m Use the astable operation mode shown in Fig.4 of the 555 datasheet, or the 50% duty cycle oscillator shown in Fig.14. The duty cycle does not have to be exactly 50%, but the oscillator frequency should closely match your filter fm frequency. Use the data sheet. Don t just grab equation from lecture. You may need to add a comparator to the output of this circuit in order to boost the 555 timer output from around 4V to 5V. This is the same thing we did in Lab 2. Simulate your circuit, and include a plot of the outputs. Supply the Reset pin of your 555 with a pulsed waveform at 30Hz, and show that the output pulses at f m while the reset pin is low. Electronics Design Laboratory 9

10 A.5 Transmitter build and test Build your 555 timer circuit on a separate breadboard Use a single resistor for R B For R A you may use a resistor 5kOhms less then calculated, and add a potentiometer in series (this will allow you to tune your transmitter to closely match your f m ) Tune your transmitter to the experimentally determined f m found earlier. It is very important to be exact! Capture a screen shot of your modulator output when the reset pin of your 555 is connected to a 30Hz square wave supplied by a function generator Insert your RF transmitter into your circuit Electronics Design Laboratory 10

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