Title: Displaying Barcode on Nokia 5110 LCD Using ESP32

[vishwjeet1231]

Hi everyone,

I'm working on a small project where I want to generate and display a barcode on a Nokia 5110 LCD using an ESP32 board.

Hardware Setup:

• ESP32 Dev Board (38-pin)
• Nokia 5110 LCD (PCD8544 controller)
• Powered via 3.3V (to avoid over-voltage)
• Connected as follows:

Nokia 5110	ESP32 GPIO
CE	22
RST	21
DC	17
DIN	23
CLK	18
VCC	3.3V
GND	GND
BL	GND

Libraries Used:

• Adafruit_GFX
• Adafruit_PCD8544

Installed via the Arduino Library Manager.

What I’ve Done So Far:

I created a test sketch that simulates a barcode by drawing vertical lines based on a string of 1s and 0s:

#include <Adafruit_GFX.h>
#include <Adafruit_PCD8544.h>

Adafruit_PCD8544 display(22, 21, 17, 23, 18); // CE, RST, DC, DIN, CLK

void drawBarcode(String pattern) {
  int x = 0;
  for (int i = 0; i < pattern.length(); i++) {
    if (pattern[i] == '1') {
      display.drawFastVLine(x, 0, 48, BLACK);
    }
    x += 1;
    if (x >= 84) break; // avoid overflow
  }
}

void setup() {
  display.begin();
  display.setContrast(60);
  display.clearDisplay();

  // Fake barcode pattern
  String barcode = "101100111000111001011000111011100101010";
  drawBarcode(barcode);

  display.display();
}

void loop() {}

Looking For:

1. A way to generate actual Code 39 or Code 128 barcodes in Arduino (or pre-converted patterns).
2. Tips for optimizing barcode width/spacing for Nokia 5110's 84x48 resolution.
3. Suggestions on a lightweight barcode library for ESP32 (if any exist).

Any advice, code snippets, or links would be super helpful!

Thanks in advance!
VJ

[pert]

I moved your topic to a more appropriate forum category @vishwjeet1231.

The Nano Family > Nano ESP32 category you chose is only used for discussions directly related to the Arduino Nano ESP32 board.

In the future, when creating a topic please take the time to pick the forum category that best suits the subject of your question. There is an "About the _____ category" topic at the top of each category that explains its purpose.

Thanks in advance for your cooperation.