ENGR 351 2020 Fall
HW 4
Name: Nicolas Llarena
Email: Njllarenaarias@fortlewis.edu

1. HW4 - LCDs

2. Introduction
The purpose of this lab is to get familiar with LCDs And Sensors while working with Arduino UNO. We will learn how to output data to an LCD. We will also work with different temperature and humidity sensors. Other tasks include learning how to use the 328P MCU as a standalonoe MCU without the Arduino UNO. We will use everything learned in this and past homeworks to make a standalone temperture meter displayed on an SSD.

3. Materials
Materials Quantity
Arduino UNO
1
Bread Board
 1
10k Ohm Resistor
 3
Thermistor
 1
tweezers
 1
330Ohm Resistor
 5
DHT11 Sensor
 1
LED
 3
jumper wires
 20
22 pF Capacitor
 2
Oscillator
 1
Pushbutton
 1
LCD
1
4-digit SSD
 1
Shifter Register
 1

4. Results
Task 1&2

               
Figure 1. LCD displaying "Hello, World!" and on the second line, the device counts to 5 and then resets to count again.
Task 3

               
Figure 2. LCD displaying scrolling text "Durango". When the text reaches the middle of the screen, it blinks three times and then continues scrolling. done with the 'lcd.clear()' command.
Task 4
            
Figure 3. Showing the room temperature on the LCD by using a thermistor by converting resistance to temperature.

Task 5
            
Figure 4. Displaying temperature and humidity of the room by using LCD and a DHT11 sensor. Sensor was blown to show change in humidity and temperature.

Task 6
            
Figure 5. Using a TMP36 (integrated circuit temperature sensor) to display room temperature.


Task 7
                   
Figure 6. Displaying codes for each key pressed on the arduino kit remote. remote worked with almost no problems. I had no access to the robot car remote at the time, but the remote used gave me no problems.

Task 8

            
Figure 7. Using the standalone 328p MCU to blink an LED on a breadboard without having to use the Arduino UNO.

Task 9
                           
Figure 8. Using the standalone 328p MCU, 4-digit SSD, Shift Register, and DHT11 to display room temperature and humidity on the SSD. (could not make it work, code might not be sufficient)

Discussion
Some parts of this homework were challenging. LCDs in general are easy and fun to work with, there are many projects that can be done easily with LCDs. I ran into some problems since my Arduino kit came with no thermistor or DHT11 so I had to borrow them from other classmates. I also only had one capacitor so I had to borrow that as well. Other than those issues, everything worked well until task 9. Task 9 was the most challenging, the wiring was not too bad, the issue I ran into was figuring out how to code everything together to work with the 4-digit SSD. The LCD would have been easier to code. If I had all the components in my kit, I would have had more time to debug my code for task 9, next time I will make sure to check whether I have all the necessary components.   Overall, this homework taught me a lot of new things that I will be able to apply in future projects.