235 lines
6.9 KiB
Markdown
235 lines
6.9 KiB
Markdown
## Bram's Learning Curve
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Here I post my progress on learning and mastering Arduino. I originally did the Game development study but decided to switch to "Technische Informatica". That is why I need to learn everything from scratch, and everything is new to me.
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This is the reason that I made these documents, in order to track my progression in this new study.
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### Buzzer
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For one of my first projects, I wanted to learn how to use a buzzer with different notes.
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To achieve this, I went on a search across sites to see how I can use frequencies to make different sounds.
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Then I came across a teaching site (https://www.codingkids.nl/arduino-buzzer.html) that taught me the language to communicate to the buzzer what frequencies to use. This way I can make any sound come out of this simple buzzer.
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### Arduino Video
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I watched a video about using Arduino and took a lot of op notes along the way.
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The link is: (https://www.youtube.com/watch?v=BLrHTHUjPuw).
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\/\/Arduino information:
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\/pinnumber(locatie, in-/output)
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\/digitalwrite(locatie, high/low)
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\/delay(time in millisec)
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\/int... <- variable
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\/with a decimal its a double -> 1,2
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\/a character is a char -> "a"
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\/\/serial communications:
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\/setup:
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Serial.begin(9600) -> the text speed
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Serial.sprintLn(text)
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\/Loop:
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Serial.print("text")
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Serial.printLn(....) -> variable because no "
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\/Ctrl + shift + M = serial monitor.
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The text speed needs to be the same as given.
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\/\/If Statements:
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if(condition){
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action
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}else{
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action
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}
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\/&& = "and"
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\/|| = "or"
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\/\/For loops:
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For(int*i; i <= 10 ; i++){
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serial.print(i)
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}
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\/The fading of led's:
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examples, basics, fade
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\/ servo's
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examples, servo, sweep
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### Linux and raspberry PI.
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To gain more knowledge about Linux, I first asked my classmates if they could get me started.
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They showed me how to gain access to a server and told me how to navigate through files.
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By doing this I got taught the following commands:
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~ $ 'ls -la' = show file / folders
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~ $ 'top' = see currently running programs
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~ $ 'cd ' = change directory
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~ $ 'mkdir name' = make directory
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~ $ 'touch name' = make file
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~ $ 'ping ip addres'
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~ $ 'ssh username@ip address' = open ssh connection.
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### Air, temperature, and all sort of stuff.
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After the Linux coding I decided to take a step back and began gaining experience with sensors.
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I began trying to make our group project's "node" for myself.
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I did this by using one of the main sensors and tried programing it myself.
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I used this website for the information and for the right library:(https://randomnerdtutorials.com/esp32-dht11-dht22-temperature-humidity-sensor-arduino-ide/).
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Aside from the website I used my teammates for help where it was needed.
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I wanted to make my own spin on the original design by including a button to activate the sensor and an LED to show if its on.
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The rest of the tutorial was clear and worked like a charm.
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the code used looks like this:
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```
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#include "DHT.h"
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#define DHTPIN 4
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#define DHTTYPE DHT11
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DHT dht(DHTPIN, DHTTYPE);
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void setup() {
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//the serial port:
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Serial.begin(9600);
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//the initial test if the code works
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Serial.println(F("DHTxx test!"));
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//the library start
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dht.begin();
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}
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void loop() {
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delay(2000);
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//a float has decimal numbers and the library reads the measurements.
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float h = dht.readHumidity();
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float t = dht.readTemperature();
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float f = dht.readTemperature(true);
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//isnan = there is no reading , the || is "or"
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if (isnan(h) || isnan(t) || isnan(f)) {
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Serial.println(F("Failed to read from DHT sensor!"));
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return;
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}
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float hif = dht.computeHeatIndex(f, h);
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float hic = dht.computeHeatIndex(t, h, false);
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//all serial.ptint's send stuff to the serial board to showcase.
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Serial.print(F("Humidity: "));
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Serial.print(h);
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Serial.print(F("% Temperature: "));
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Serial.print(t);
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Serial.print(F("°C "));
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Serial.print(f);
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Serial.print(F("°F Heat index: "));
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Serial.print(hic);
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Serial.print(F("°C "));
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Serial.print(hif);
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Serial.println(F("°F"));
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}
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```
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And the physical board looks like this:
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And here it looks in action:
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Later on, I could expand this code and the physical product to include the rest of the sensors.
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### Buzzers .pt 2
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I found out how to make multiple buzzers go off with the press of one button and increase as Mutch as there are pins.
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I tried to not look up anything for this one but did ask questions from time to time.
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I designed it to work with scanning if there is any input and then output this signal to activate the buzzers.
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This output signal can activate over multiple pins so this one button can set off all sorts of stuff.
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The code is short and simple:
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```
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//set up some variables
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int button = 20;
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int buzzerone = 12;
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int buzzertwo = 11;
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void setup() {
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//put down some pins that will output , and some that input.
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pinMode(button, INPUT);
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pinMode(buzzerone, OUTPUT);
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pinMode(buzzertwo, OUTPUT);
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}
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void loop() {
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//read is there is input on the button pin, if so send output to the other pins., otherwise keep them off.
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if(digitalRead(button) == HIGH){
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digitalWrite(buzzerone, HIGH);
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digitalWrite(buzzertwo, HIGH);
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}else{
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digitalWrite(buzzerone, LOW);
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digitalWrite(buzzertwo, LOW);
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}
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}
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```
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Here I made the physical design but instead of buzzers i used lights in order to show it working.
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And here is the the board working:
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### Python For Dummies.
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My job was to make a connection between the WebSocket and the database we had set up, and to do this we wanted to use python.
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I had never used python before and was totally new to the entire code structure and wording.
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Because I was totally new to all of python, I asked ChatGPT for and example and some concrete code.
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I asked it my question which was the assignment I was given and tried to reverse learn this way.
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I went and looked up fitting tutorials on W3SChools.
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The following were used:
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(https://www.w3schools.com/python/python_mysql_getstarted.asp)
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(https://websockets.readthedocs.io/en/stable/)
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(https://www.w3schools.com/python/python_mysql_insert.asp)
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(https://www.w3schools.com/python/python_json.asp)
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After still not getting it very well i asked Dano (a teammate of mine) if he could teach me some basics, and so we did.
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He taught me how to make a simple calculator and told me why my code worked the way it did.
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(This was the code:
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print("1 = + 2 = -")
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c = int(input())
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print("first number")
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a = input()
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print("second number")
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b= input()
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if c == 1:
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print(int(a) + int(b))
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elif c == 2:
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print(int(a) - int(b))
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)
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Even if it looked simple, this was the ignition I needed to understand python better and continue my own research. |