Wemos D1 mini Serial reading with scanner.

[Aeoxia]

Good Day!
I am new in programming controller and i am trying to connect a barcode scanner and read data using wemos d1 mini.
I tried following this guide.
http://forum.arduino.cc/index.php?topic=288234.0
and was able to make the barcode scanner work with arduino uno by using this code.

const byte numChars = 32;
char receivedChars[numChars]; // an array to store the received data

boolean newData = false;

void setup() {
 Serial.begin(9600);
 Serial.println("<Arduino is ready>");
}

void loop() {
 recvWithEndMarker();
 showNewData();
}

void recvWithEndMarker() {
 static byte ndx = 0;
 char endMarker = '\n';
 char rc;
 
 // if (Serial.available() > 0) {
           while (Serial.available() > 0 && newData == false) {
 rc = Serial.read();

 if (rc != endMarker) {
 receivedChars[ndx] = rc;
 ndx++;
 if (ndx >= numChars) {
 ndx = numChars - 1;
 }
 }
 else {
 receivedChars[ndx] = '\0'; // terminate the string
 ndx = 0;
 newData = true;
 }
 }
}

void showNewData() {
 if (newData == true) {
 //Serial.print("This just in ... ");
 Serial.println(receivedChars);
 newData = false;
 }
}

I then tried to apply the same logic for my wemos and connected the barcode scanner's pins to tx and rx as shown in my attachment below. I am very confused on how i will be able to read the data using wemos mini d1 since it shows nothing on my serial monitor. i have tried changing the baud rate to 115200 and read some more similar posts but failed to understand which should i fix the breadboard connections or the code. Please help me make this work. Thank you so much for taking time in reading this post.

[J-M-L]

Your image

Try to think or learn about what Rx and Tx are connected to (here is something to read or that reference too)

[Robin2]

@Aeoxia,

What is the thing in the orange plastic bag?

A photo of a connection diagram drawn in pencil will be much easier to understand.

...R
Simple Image Guide

[Whandall]

Robin2:
What is the thing in the orange plastic bag?

Probably the serial scanner he wants to read?

And the "orange plastic bag" looks like Kapton tape to me.

[Robin2]

Whandall:
Probably the serial scanner he wants to read?

I was trying to make the point to the OP that s/he needs to provide a lot more information.

...R

[Aeoxia]

Robin2:
@Aeoxia,

What is the thing in the orange plastic bag?

A photo of a connection diagram drawn in pencil will be much easier to understand.

...R
Simple Image Guide

The one in kapton tape is the barcode scanner

(Wemos)TX->RX (Barcode)

(Wemos)RX->TX (Barcode)

J-M-L:
Your image

Try to think or learn about what Rx and Tx are connected to (here is something to read or that reference too)

I have read the links you have given and have learned that serial monitor cannot be used once UART0 was used to communicate with another hardware. I am limited into using UART0 since i need to receive data and since i cannot use the serial monitor i have tried my own way of checking the processes.

for every condition or function want to test i set an assigned pin to HIGH to know which ones are working but unfortunately neither of the functions im using was working.

void loop() { // run over and over
  recvWithEndMarker();
 showNewData();
}

void recvWithEndMarker() {
 static byte ndx = 0;
 char endMarker = '\n';
 char rc;

 // if (Serial.available() > 0) {
           while (Serial.available() > 0 && newData == false) {

digitalWrite(D5, HIGH);
delay(500);
digitalWrite(D5, LOW);
 rc = Serial.read();

 if (rc != endMarker) {
 receivedChars[ndx] = rc;
 ndx++;
 if (ndx >= numChars) {
 ndx = numChars - 1;
 }
 }
 else {
 receivedChars[ndx] = '\0'; // terminate the string
 ndx = 0;
 newData = true;
 }
 }else{
 digitalWrite(D6, HIGH);
delay(500);
digitalWrite(D6, LOW);
}
}
void showNewData() {
digitalWrite(D2, HIGH);
delay(500);
digitalWrite(D2, LOW);

 if (newData == true) {
digitalWrite(D3, HIGH);
delay(500);
digitalWrite(D3, LOW);
 Serial.println(receivedChars);
 newData = false;
 }
}

This puts me in a bind of being unable to determine whether the code im using is working, or maybe the scannerSerial->wemosSerial is wrong?

(Wemos)TX->RX (Barcode)

(Wemos)RX->TX (Barcode)

or maybe wemos really cannot handle this serial connection and i am misusing wemos?? i have searched a lot of examples and i have not seen any wemos used alone it is always paired to arduino to read the serial data. I always have wanted to use wemos d1 mini+scanner alone since since ill be able to achieve a smaller form factor.

[Robin2]

Aeoxia:
The one in kapton tape is the barcode scanner

(Wemos)TX->RX (Barcode)

(Wemos)RX->TX (Barcode)

That suggests that you are missing an essential GND connection.

Draw a diagram with pencil showing all the connections as I asked for in Reply #2 - then we will have all the necessary information in a neat package with no confusion.

...R