HELP ME PLEASE! I'm stressed out like crazy

Projects General Guidance
1

Please help, I am working on a project about a scanner for borrowing books in a library. I chose the top clip and ordered the equipment to do it, but it turned out that I had problems from the first step! I've been stuck with this problem for almost 2 weeks now. And it's getting close to the day I have to submit my work. But no matter what I do, the numbers never appear on the monitor. I don't know why!

Here's the video I used as an example!

You can say I'm stupid. But I'm really confused. I feel like crying

2

It seems like you are really so confused that you can't even explain what your problem is.
There is no point in showing someone else's video where it works.
Show us your code and wiring diagram.

3

So you want someone else to do your work for you?

4

I tried to connect the circuit according to the website and it was confusing. When I saw the video, I was even more confused.

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <SoftwareSerial.h>
SoftwareSerial mySerial(4, 3); // RX, TX

#define SCREEN_WIDTH 128    // OLED display width, in pixels
#define SCREEN_HEIGHT 64    // OLED display height, in pixels
#define OLED_RESET -1       // Reset pin # (or -1 if sharing Arduino reset pin)

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup() {
  Serial.begin(19200);  
  mySerial.begin(19200); // set the data rate for the SoftwareSerial port
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0,0);
}

void loop() {
  if (mySerial.available()) { // Check if there is Incoming Data in the Serial Buffer.
    display.clearDisplay();
    display.setCursor(0, 0); //oled display
    display.clearDisplay();

    while (mySerial.available()) { // Keep reading Byte by Byte from the Buffer till the Buffer is empty
      char input = mySerial.read(); // Read 1 Byte of data and store it in a character variable
      Serial.print(input); // Print the Byte
      display.print(input); // Print the Byte on OLED
    }

    display.display(); // Update the display with all new content
    Serial.println();
  }
}

I just learned to code. forgive me
Arduino-Barcode-QR-Code-Scanner-Reader-690x439

5

No, just please tell me what I'm doing wrong. That's it.

6

Break it down into parts.

  1. Run one of the examples for your screen to know if its working correctly.
  2. isolate the code for the scanner and see if you get anything in the Serial Monitor
  3. make sure you have an adequate power supply. 5 volt @ 2 Amps.
7

I see the error.
EDIT, I was mistaken, I didn't realize the picture was upside down and of extremely poor quality so I mistook what looked like A5 for the correct 5V, see how they are almost exact mirror images.

8

thank you for code.
Now tell us, what did you expected from it, and what you got in reality

9
  • Lets see good images of your actual wiring.
10

I'm not sure because I'm not the one who thought about this project. But my friend said that he wanted it to act as a librarian.
(Sorry, English is not my native language)

When I run the code that the website gives as an example, this problem always occurs.

11

Make sure the baud rates match. You are using 19200 in your code, so the serial monitor needs to also be 19200. By default it is set to 9600.

12

Yes, at first I thought so. But no matter what I do, I always get the same results.

13

swap the values in mySerial(4, 3);

14

(4,3)
It keeps flowing and when I scan it it says '?'

(3,4)

Nothing happened at all.

15

Its still set for 9600 baud, look at the value in the lower right corner of the serial monitor. That needs to match whatever is in your code.

16

the baudrate on your screen is set to 9600, but 19200 in the code!

17

I changed it all to match.

18

So why did you posted a wrong screenshot?

19

I try to change it gradually. Sometimes it's 9600. Sometimes19200 I don't forget.

20

I looked up your scanner. Are you using the 5 pin port or the 6 pin port?