A lab report by Tal Genkin
Below is the lab report for the Lab 1 : Frankenlight
a. What color stripes are on a 100 Ohm resistor?
There is a brown stripe, two black stripes, a red stripe and in between there there are green stripes.
b. What do you have to do to light your LED?
After setting up the board as shown in the image above, I connected the USB cord to my laptop for a power supply and pressed the button. When the button is pressed, the light is on.
a. What line(s) of code do you need to change to make the LED blink (like, at all)?
I took the Blink example as is.
b. What line(s) of code do you need to change to change the rate of blinking?
I changed the first delay and the second delay commands to affect the time during which the LED is on and off respectively.
c. What circuit element would you want to add to protect the board and external LED?
The resistor, which I connect to the ground.
d. At what delay can you no longer perceive the LED blinking? How can you prove to yourself that it is, in fact, still blinking?
After trying several different delay durations, starting from 50 miliseconds to 10 ms, the edge of my ability to see the blinking is around 12 ms. When I decrease the delay durations in one ms each time, it starts to look more and more constant. At 13 the eye can still see it's not completely constant.
e. Modify the code to make your LED blink your way. Save your new blink code to your lab 1 repository, with a link on the README.md.
// the setup function runs once when you press reset or power the board, it is also uploaded to the repository void setup() { // initialize digital pin LED_BUILTIN as an output. pinMode(LED_BUILTIN, OUTPUT); }
// the loop function runs over and over again forever void loop() { digitalWrite(LED_BUILTIN, HIGH); // turn the LED on (HIGH is the voltage level) delay(100); // wait for a tenth of a second digitalWrite(LED_BUILTIN, LOW); // turn the LED off by making the voltage LOW delay(10); // wait for a hudreth of second }
Make a video of your LED blinking, and add it to your lab submission.
a. Are you able to get the LED to glow the whole turning range of the potentiometer? Why or why not?
Yes, the LED lights from the point it has the most brightness to the point where it's almost turned off, because of the potentiometer.
a. What do you have to modify to make the code control the circuit you've built on your breadboard?
I need to modify the brightness, which is one of the parameters in the code (initially from the Fade example).
b. What is analogWrite()? How is that different than digitalWrite()?
digitalWrite is binary: it's either HIGH or LOW, while analogWrite can have several distinct descrete options.
a. Is there computation in your device? Where is it? What do you think is happening inside the "computer?"
Yes, since it is a smartphone, there is a chip right next to the battery.
b. Are there sensors on your device? How do they work? How is the sensed information conveyed to other portions of the device?
There is a camera, a flashlight and LEDs, as well as the smartphone's screen.
c. How is the device powered? Is there any transformation or regulation of the power? How is that done? What voltages are used throughout the system?
It has a Li-Ion battery of 3.8V, which can be charged using a USB cord.
d. Is information stored in your device? Where? How?
Since it's a smartphone, there is a chip and it has memory.
2. Using your schematic, figure out where a good point would be to hijack your device and implant an LED.
Describe what you did here.
I tried to look more closely at the button:
I tried to connect it to the Breadboard, without success, using one of the metal connectors.
Make a video showing off your Frankenlight.
Include any schematics or photos in your lab write-up.
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