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LCD sniffer for 12 pin custom LCD

VikramSaharan

Hello everyone 

I am trying to interface a TDS test pen with arduino. It has a 12 pin custom LCD. I want to get its LCD readings on serial monitor. I have no data sheet of the device under question.  Kindly help. 

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  • 0 in reply to anniel747

    I connectd scl and sda and run I2C scanner on arduino i2c device foun at 0*50. when I run eprom read code 

    #include <Wire.h>

    #define EEPROM_ADDRESS 0x50  // The EEPROM I2C address

    void setup() {
      Serial.begin(9600);   // Start serial communication at 9600 baud
      Wire.begin();         // Initialize the I2C bus
     
      // Example: Write data to EEPROM and verify
      Serial.println("Writing 0x55 to address 0x01");
      writeEEPROM(0x01, 0x55);   // Write 0x55 to address 0x01
      delay(10);
     
      byte writtenData = readEEPROM(0x01);
      Serial.print("Data read from address 0x01: 0x");
      Serial.println(writtenData, HEX);  // Verify if data was written successfully
    }

    void loop() {
      Serial.println("Reading first 16 bytes of EEPROM:");
     
      // Read and display data from the first 16 addresses of the EEPROM
      for (int addr = 0; addr < 16; addr++) {  // You can increase the range to read more bytes
        byte data = readEEPROM(addr);
        Serial.print("Address 0x");
        Serial.print(addr, HEX);
        Serial.print(": Data 0x");
        Serial.println(data, HEX);
      }
     
      delay(5000);  // Delay 5 seconds before reading again
    }

    // Function to read a byte from a specific EEPROM address
    byte readEEPROM(int addr) {
      Wire.beginTransmission(EEPROM_ADDRESS);
      Wire.write((byte)addr);    // Specify the EEPROM address to read from
      Wire.endTransmission();
     
      Wire.requestFrom(EEPROM_ADDRESS, 1);  // Request 1 byte from EEPROM
     
      if (Wire.available()) {
        return Wire.read();      // Read and return the byte
      } else {
        return 0;  // Return 0 if no data is available
      }
    }

    // Function to write a byte of data to a specific EEPROM address
    void writeEEPROM(int addr, byte data) {
      Wire.beginTransmission(EEPROM_ADDRESS);
      Wire.write((byte)addr);  // Specify the EEPROM address to write to
      Wire.write(data);        // Write the data byte
      Wire.endTransmission();
      delay(10);               // EEPROM write requires a short delay
    }
    out put is   
    Address 0x3: Data 0xA0

    Address 0x4: Data 0xA0

    Address 0x5: Data 0xA0

    Address 0x6: Data 0xA0

    Address 0x7: Data 0xA0

    Address 0x8: Data 0xFF

    Address 0x9: Data 0xFF

    Address 0xA: Data 0xFF
  • 0 in reply to VikramSaharan

    I checked on PCB that eprom is connected with HOLD button to hold readings

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