How to read ASCII values from AT24C32 IC using Arduino? And what is serial.begin(?) in that EEPROM?

Question

#include<Wire.h>
#include<Eeprom24C32_64.h>
#define EEPROM_ADDRESS 0x000

void setup() {
  Serial.begin(9600);
  eeprom.initialize();
  const word address = 0x000;
  const byte count = 94;
  byte inputBytes[count] = { 0 };
  byte outputBytes[count] = { 0 };
  Serial.println("Read bytes from EEPROM memory...");
  eeprom.readBytes(address, count, outputBytes);
  Serial.println("Read bytes:");
  for (byte i = 0; i < count; i++) {
    Serial.write(outputBytes[i]);
    Serial.print(" ");
  }
  Serial.println("");
}

void loop() {
}

Next code... I have tried many sketches.

#include <EEPROM.h>

void setup () {
  Serial.begin (115200);
  Serial.println ();
  for (int addr = 0x0000; addr < 0x0010; addr++) {
    Serial.print ("Address = ");
    Serial.print (addr, HEX);
    Serial.print (", value = ");
    Serial.println (EEPROM.read(addr), HEX);
  }
}  // end of setup

void loop () {
}

And most of the sketches check the internal EEPROM of the Arduino, not the external, stored on address 0x000. I want to read data from external AT24C32.

@IHaveQuestion Please don't post code in the comments. Edit your question and add the code there. — sempaiscuba
– sempaiscuba, Commented Dec 20, 2017 at 12:16

jose can u c · Accepted Answer · 2017-12-20 15:20:42Z

1

You have to know what the I2C address of your EEPROM is. Right now you have

#define EEPROM_ADDRESS 0x000

The example from the library you cite has this:

/**************************************************************************//**
 * \def EEPROM_ADDRESS
 * \brief Address of EEPROM memory on TWI bus.
 ******************************************************************************/
#define EEPROM_ADDRESS 0x50

Then, you have to create an instance of the Eeprom24C32_64 object:

static Eeprom24C32_64 eeprom(EEPROM_ADDRESS);

That sets up the object for the EEPROM on the right I2C address, so you can later use the eeprom object to read and write.

answered Dec 20, 2017 at 15:20

jose can u c

6,9742 gold badges17 silver badges27 bronze badges

Your picture shows an LCD display. Are you expecting output to that?

jose can u c
– jose can u c

2017-12-21 03:44:43 +00:00
Commented Dec 21, 2017 at 3:44

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