Revision 0:591946e65c5b, committed 2015-01-07

Comitter:

kevinmark13

Date:

Wed Jan 07 00:13:04 2015 +0000

Commit message:

Lab 2 Part 3

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Jan 07 00:13:04 2015 +0000
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+
+/**********************************************************************************************************************************
+
+NAME: Kevin Maddox
+DATE: 2 JAN 2015
+
+    1. In this part of the Lab 2, you are given a 10kohm linear rotary potentiometer (included) in the kit, 
+    and then a resistor with unknown resistance (pick one resistor out of your resistor envelope in the kit). 
+    Without any meters, your task is to use the mbed to find out the resistance of the resistor of unknown resistance. 
+    Your are free to use any of the LEDs for indication.
+    
+    2. Design the hardware connection of the potentiometer and the unknown resistors to mbed to produce various voltages 
+    to some point of the circuit. Use your mbed to read the voltage at this point. Study the potentiometer that is provided in 
+    your kit, research and find the circuit diagram of such potentiometer and how you should connect it to mbed so that 
+    you can get various voltage reading from some point of the circuit. 
+    You may use the Vout of the mbed platform to provide the consistent voltage to your circuit of the potentiometer 
+    and the unknown resistor, but take into consideration (if needed) of limiting current when the potentiometer produce 
+    a zero resistance into the circuit. Use the analog input and the Tara Term to display your measurement. Build your circuit 
+    and include all the required information about your hardware design in your lab report.
+    
+    3. Based on the hardware you designed, write a code that takes voltage measurement every 10 seconds and write it to the 
+    Tera Terminal. You are also required to find a way to indicate to the user that he/she is free to change the potentiometer 
+    setting (no measurement is being currently taken). Your program will read the voltage and display the actual voltage reading 
+    to the Tear Terminal. What settings on the potentiometer is important to help you figure out the resistance of the unknown 
+    resistor? 
+    
+    4. Use your system to adjust your potentiometer and take various voltage readings (at least ten including the 
+    readings that are important for finding the resistance of the unknown resistor). Include screen shots of your potentiometer 
+    positions and also the sreenshots of the voltage readings displayed in the terminal. 
+*************************************************************************************************************************************/
+#include "mbed.h"
+
+Serial pc(USBTX, USBRX);  //define transmitter and receiver
+
+AnalogOut Aout(p18);  //defines the analog output on pin 18
+AnalogIn Ain(p20);    //defines the analog input on pin 20
+
+
+int main() 
+{
+pc.printf(" Code will now take voltage measurement every 10 seconds \n");
+pc.printf(" and will write it to the Tera Terminal. \n");
+pc.printf(" You are free to change the potentiometer setting at anytime. \n");
+
+    while(1) 
+    {
+       Aout = Ain;
+       float c = Aout * 3.3; // puts Aout value to c; Aout takes a floating poing number between 0.0 and 1.0
+                             // the actual output voltage on p18 is between 0v=3.3v, we scale this with * 3.3v
+       
+       
+       pc.printf ("%f \n", c);  //prints to Tera Term the Decimal floating point, lowercase from Aout
+       
+       wait(5);  //wait command before next reading
+       
+
+    }
+}

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+++ b/mbed.bld	Wed Jan 07 00:13:04 2015 +0000
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+http://mbed.org/users/mbed_official/code/mbed/builds/4fc01daae5a5
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