CE351 Lab 4 2020 Fall
LCDs and Sensors
Name: Audra Benally
Email: albenally1@fortlewis.edu

1. Introduction
    In this lab, a liquid crystal display was paired with several different sensors in 7 different tasks. The sensors used were a thermistor, a DHT11 humidity sensor, a TMP36 temperature sensor, and an IR receiver sensor. After these tasks were completed, the microcontroller chip was removed and the "bare bones" microcontroller was programmed to blink a light then make a portable digital temperature meter.

2. The Code and the Results

1. The LCD:


   
                Figure 1. First circuit code used to print "Hello, World!" and seconds.

   
                Figure 2. "Hello, World!" printed on the LCD screen.

~~~~~~~ Task 1:

   
                Figure 3. Task 1, the difference is on line 9 where the cursor is set to the second column, first row.

   
                Figure 4. The resulting LCD screen from the task 1 code.

~~~~~~~ Task 2:

   
                Figure 5. Task 2 code with added flair on line 34.

    Link: https://youtu.be/aCb6Q5638CU
                Video 1. Task 2 LCD screen result, the video did not go long enough to show the reset to 0 but the code does make it repeat (void loop).

~~~~~~~ Task 3:

   
                Figure 6. Task 3 code.

    Link: https://youtu.be/TGXlwWFhSMs
               Video 2: Resulting LCD screen from task 3 code.

~~~~~~~ Task 4:

   
                Figure 7. Task 4 code.

    Link: https://youtu.be/gXWPflrstSc
                Video 3. Resulting LCD screen from task 4 code.

~~~~~~~ Task 5:

   
                Figure 8. Task 5 code.

   
              Figure 9. Resulting LCD screen from task 5 example code.

    Link: https://youtu.be/epgjx93QxGY
                Video 4. Task 4 LCD screen from code from figure 8.

~~~~~~~ Task 6:

   
              Figure 10. Task 6 code.

   
             Figure 11. Resulting LCD screen from task 6 code. TMP36 sensor is also connected on the left.

~~~~~~~ Task 7:

   
             Figure 12. Task 7 code with switch cases changed for the following remote control.

   
             Figure 13. My own remote used for task because I did not grab the given remote.

    Link: https://youtu.be/IVprw8mMDgI
             Video 5. Video taken pressing all the buttons that were mapped in the code from figure 12.

~~~~~~~ Task 8: Bare Bones

   
             Figure 14. Bare bones circuit set up.

    Link: https://youtu.be/UWkfdQUzQYU
             Video 6. Code and blinking led from the bare bones set up.

~~~~~~~ Task 9: Portable Thermometer

   
             Figure 15. Full Circuit (including blink circuit) with one missing capacitor by the orange wires (near oscillator). Before getting capacitor replaced.

   
             Figure 16. Task 9 code. I realized too late that I should have used the shift register to display the digits.

    Link: https://youtu.be/aejy1-5j9n0
             Video 7. After much tinkering this is what I was able to do.

Discussion:
    Learning about LCS screens and sensors in this lab was very informational. The LCD screen coding was easy to understand and learn. The IR sensor was really fun to play with and I enjoyed mapping an unknown remote control. The bare bones circuit was tricky, especially with all the issues. I was able to get the LED blink to work but the thermometer was giving me problems. In my debugging I switched out the temperature sensors which is why it is different in Figures 15 and 16. I was unable to get the A and F segments to work; I tested the seven segment display in another circuit then I tried switching to analogRead(), then I switched out the wires. I'm not sure what the problem was but maybe it had something to do with those being the only analog pins used? Overall, awesome lab!!