User`s Manual/Installation Manual
Contents
1. run the following MATLAB script clear all load sine dat sine transpose sine plot t sine Plot time domain signal axis 0 4 tone_freq 1 2 1 2 Only view 4 periods of time domain title Time domain signal xlabel Time s sound sine fs Listen to the audio of the signal y fft sine length t Compute the FFT f fs length y 1 length y scaling frequency axis by fs figure plot f real y Plot frequency domain signal axis 0 95 tone_freq tone_freq 1 05 0 3500 title Frequency domain spectrum xlabel Frequency Hz 8 After running the script you should hear a sample of the signal and see the following figures 2 Figure 2 o File Edit View Insert Tools Desktop Window Help File Edit View Insert Tools Desktop Window Help ATODOL TALEE EET ODECE AOLELE Time domain signal Frequency domain spectrum 3500 3000 2500 1L L 1 r L 960960970980 390 1000 1010 1020 1030 1040 1050 Frequency Hz2. User s Manual Installation Manual PC Software Setup This program must be run on Linux A terminal emulator may work as well but performance is not guaranteed Put the software in a working directory call it Work In Work enter the command make Then enter the command sudo readSerialPort Troubleshooting Alternatively if you do not want to worry about which directory you are in simply enter the command sudo cat lt serial device gt gt gt lt output file name gt lt serial device gt is how the computer recognizes the USB device plugged in Hardware setup 1 Plug in both USB connectors to computer with Linux operating system a Both board power LEDs should light up if on 2 Verify that the 5V 5V and GND pins are properly connected to their corresponding labeled pins on the breadboard Use DMM to test if necessary How to test if system is working 1 Connect phone to breadboard via the provided audio cable Using Signal Generator phone app play a 1kHz sine wave with maximum amplitude and the volume turned to maximum Turn off speaker if too loud 2 Using the grey buttons set the recording time on the LCD display to 2 seconds 3 Press the red record button 4 On your computer locate the newly created dat file in your local directory 5 Move the dat file to your working MATLAB directory and rename it to sine dat 6 With the sine dat file in your MATLAB working directory
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