SD Card With Toggle Switch & LED

1//Code By: Bo Bowman
2//This code connects toggle switch, LED, and SD  card (microSD card) together on a breadboard. 
3//Includes Fritzing diagram 
4
5//Connect  wiring as follows: https://create.arduino.cc/projecthub/GeneralSpud/toggle-switch-3763a2  
6//Connect switch pin to 3 (instead of pin 4 from the above url) 
7//Connect  led pin to 9 (instead of pin 5 from the above url) 
8//Use a 220 Ohm resistor  for the LED
9//Use a 1k Ohm resistor for the toggle switch 
10
11//Used Arduino  Uno R3 
12//Used 128GB SD card 
13//Used an SD Card Reader (microSD card reader),  purchased here: https://www.amazon.com/gp/product/B06ZYXR7DL/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1  
14//Used a standard MicroSD card adapter board with CS (chipselect), SCK, MOSI,  MISO, VCC pins on it. You can also buy one from adafruit here: https://www.adafruit.com/product/254?gclid=CjwKCAjwu5yYBhAjEiwAKXk_eB9RXsR5mKURYSPj84TBgerp9w3ubaqiiiWZdjVea9gIhsvzKWevyBoCCk4QAvD_BwE
15//Used  these instructions for wiring of the SD card: https://learn.adafruit.com/adafruit-micro-sd-breakout-board-card-tutorial/arduino-library  
16//IMPORTANT: You must format your 128GB SD card prior to using it!! 
17//Initialize  the SD card to FAT 16 using the following instructions for Mac OSX:  
18//http://arquivo.splat-n.com/scripts/format-a-flash-card-as-fat16-in-mac-os-x/  
19//See here for additional code on reading and writing data to a MicroSD card:  https://create.arduino.cc/projecthub/electropeak/sd-card-module-with-arduino-how-to-read-write-data-37f390
20
21//Used  a modified version of this code, for reading/writing to/from the SD card: https://create.arduino.cc/projecthub/electropeak/sd-card-module-with-arduino-how-to-read-write-data-37f390  
22
23//Wiring for the SD card: 
24//Connect CS to pin 10
25//Connect SCK to  pin 13 
26//Connect MOSI to pin 11
27//Connect MISO to pin 12
28//Connect VCC  along the + line of the breadboard, to the right of the wire that connects the +  line to 5V pin on the Arduino (the left side should go to the toggle switch) 
29//Connect  GND to pin GND 
30
31// Rocker on/off switch (basic toggle switch) from Amazon
32//  https://www.amazon.com/gp/product/B07XC5KB8D/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1  
33
34//Initialization Code for LED and toggle switch 
35int switch_pin = 3;  
36int led_pin = 9; 
37
38//Initialization Code for ID card 
39#include <SPI.h>
40#include  <SD.h>
41File myFile;
42
43void setup() {
44  //setup code runs only once
45
46  //Setup Code for switch & LED 
47  pinMode(switch_pin, INPUT); //set mode for  pin switch 3 to input 
48  pinMode(led_pin,OUTPUT); //set mode for led pin 9 to  output 
49
50  //Setup Code for SD Card 
51  
52    // This code helps prevent  error during SD card initiliazation. Note that you also must reformat your MicroSD  card to FAT 16 format with a USB MicroSD adapter prior to using this code! 
53  pinMode(10,OUTPUT); // set pin (the CS pin for the MicroSD card adapter board)  to pin 10, and set it as Output mode 
54  digitalWrite(10,HIGH); //initialize the  CS pin of the MicroSD card adapter board to HIGH 
55
56  // Open serial communications  and wait for port to open:
57  Serial.begin(9600);
58
59  while (!Serial) {
60    ; // wait for serial port to connect. Needed for native USB port only
61  }
62  Serial.print("Initializing SD card...");
63  if (!SD.begin(10)) {
64    Serial.println("initialization  failed!");
65    while (1);
66  }
67  Serial.println("initialization done.");
68  // open the file. note that only one file can be open at a time,
69  // so you  have to close this one before opening another.
70  myFile = SD.open("test.txt",  FILE_WRITE);
71  // if the file opened okay, write to it:
72  if (myFile) {
73    Serial.print("Writing to test.txt...");
74    myFile.println("This is a  test file :)");
75    myFile.println("testing 1, 2, 3.");
76    for (int i  = 0; i < 20; i++) {
77        myFile.println(i);
78    }
79    // close the file:
80    myFile.close();
81    Serial.println("done."); 
82  } 
83  else {
84    //  if the file didn't open, print an error:
85    Serial.println("error opening test.txt");
86  }
87  
88 
89}
90
91void loop() {
92  // main code here runs repeatedly:
93
94  if (digitalRead(switch_pin) == HIGH){
95    digitalWrite(led_pin,LOW);
96    
97  }
98  if (digitalRead(switch_pin)==LOW){
99    digitalWrite(led_pin,HIGH);
100  }
101}