# Arduino Lab 1 - The Voltage Divider

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1 Arduino Lab 1 - The Voltage Divider 1. Introduction In this lab, we will endanger a cute animal, create a portal to another dimension, and invent a new genre of music. Along the way, we will learn about breadboarding, voltage dividers, photoresistors, and using the TOMYUM SynthScope with MATLAB. 2. Some Basic Circuit Theory Circuits are generally designed to accomplish some sort of fixed task, such as blinking a light or amplifying a sound signal. Often, however, you will want to add user input to your circuit, so that you can change its behavior on the fly (for example, setting the blink rate or adjusting volume). A common way of doing this is to use a potentiometer. A potentiometer looks like this: A potentiometer is a three terminal device. The resistance between the two outermost terminals, R1 3, is constant (this constant value is in fact written on the side of the potentiometer), but the center terminal (2) acts as a wiper that slides back and forth along the resistor as you rotate the potentiometer. Therefore, R1 2 and R2 3 change, but their sum R1 2 + R2 3 = R1 3 is constant. Note that the potentiometer is symmetrical. In this case, we will be using the potentiometer as an input to a MATLAB program, with the TOMYUM SynthScope as an intermediary. However, the SynthScope like many devices measures voltages, not resistance, so we must find a way to convert a change in resistance into a change in voltage. Enter the voltage divider. 1

2 Here is a circuit schematic showing a potentiometer used as a voltage divider: Through simple circuit analysis, it can be shown that: Now, since R1 3 is constant, and R2 3 will range from 0 Ω to R1 3 Ω, we can see that Vout will vary linearly from 0 V to Vin V, proportional to R2 3. In essence, we have created a simple way for the user to control the voltage Vout (by turning the potentiometer). 3. Introduction to the Arduino Platform In front of you is a highly capable micro-controller the Arduino Duemilanove: Yours will look like the one on the right, as it has the protoshield attached. This is an extension board that extends the pin headers on the main board while also providing a breadboard prototyping surface. You ll find that the board has plenty of connections. In this lab, we will be connecting the board with the USB connection (no external power supply is required) and then using the Analog Inputs and power connections on the board. 2

4 j. Make a note of this number 2. Opening command prompt a. Click Start button b. Click Run c. Type cmd for the command prompt d. Type in (if not already in C:\users) : chdir C:\users\ i. If installed on home computer, use directory where Arduino Uploader is located e. In the command prompt, type the following with a single space in between: avrdude (the program to flash the board) -c stk500v1 (the programmer used) -P comx (the COM port replace X) -p m328p (the microcontroller model) -b (the controller baud rate) -U flash:w: main.hex (flash the board by writing the file to the chip) This should look like the following: (Remember: replace X with your COM port if Arduino is on COM port 8, use com8 ) 4

6 The readanalog command tells MATLAB to measure the voltage at the SynthScope s input pin. To view visually how this value changes over time, try running the following command: showscope(s, CHANNEL) Notice how the value changes as you move the potentiometer. Is this what you expected? What happens if you flip the potentiometer around? 5. Practical Example #1: Rotating a Marmoset Here, on the left, we have included for you an ordinary marmoset. Problem is, he s been sitting in this lab manual for as long as he can remember and has really become quite bored. Notice his concerned expression and unnatural tenseness. Let s use what we ve learned so far to entertain him. We will now use the voltage output from the potentiometer to control the behavior of a software application, in effect creating a new input device for the computer. With the same circuit setup as before, try running the program in marmoset.m and rotating the potentiometer around. Now, you may find that rotating your marmoset is more fun than you could ever have anticipated. Just be careful not to rotate him too far, lest he slip off and injure himself. What does each command in the above program do? Can you add to the program to make MATLAB display a warning message when the marmoset reaches a dangerous incline? (Hint: try using the msgbox command) What other things could you control with the potentiometer? 6

7 On second thought, the marmoset actually doesn t seem too happy with all this moving around. Can you construct a voltage divider using fixed resistors such that he will constantly remain at a comfortable 30 degrees? 6. Practical Example #2: A Dimension-Piercing Flashlight Voltage dividers are also very useful when using photoresistors, a special type of resistor that changes resistance according to the amount of light that hits it. The more illuminated the photoresistor is, the lower its resistance; the less light hits it, the higher its resistance. In order to sense light intensity, we again wish to convert this change in resistance into a change in voltage, so we will use a voltage divider as shown in the following diagram: Using the circuit above, construct two separate light sensors (one facing leftwards and one facing rightwards) on your breadboard and connect the output voltage of each to an analog input on the SynthScope. For R1, choose any value of resistor (100Ω to 10kΩ) for now; we will fine tune it momentarily. Use the analogread command again to see what voltages are being output by your voltage dividers in ambient light. Since we will want to sense both increases and decreases in light, with the maximum possible dynamic range, we ideally would like the ambient light voltage to be 2.5 V (why?). Try calculating a more appropriate value for R1 to satisfy this design goal, and replace the resistor in your circuit. Now try using the showscope command again to see how these voltages change as you play around with a flashlight: showscope(s, [CHANNEL1, CHANNEL2]); 7

8 Try running the flashlight.m example program to see an example of how to use these two light sensors in tandem to locate the source of a light (you will need to change CHANNEL1 and CHANNEL2 in the program to match your circuit setup). Can you figure out how the program is working? For a brief non educational distraction, try changing the colormap command s argument. (Hint: type help graph3d into the MATLAB prompt to find a list of colormaps.) 7. Design Challenge: Synthesizer Try using what you have learned so far to make your own new kind of musical instrument, using the potentiometer and/or light sensors. To generate sound, connect a buzzer to the Digital Out 9 pin, and use the following two commands: writewave(s, SINE ) will start sound output; you only need to run this once setwavefreq(s, FREQUENCY) will change the frequency of the sound output Remember that frequencies around 3kHz sound best with the buzzer we are using. Go for it! 8

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