Arduino and External EEPROM

Reading and writing to a 24LC512 external EEPROM chip with Arduino.

[amitpatelpatel]

The best demonstration on YouTube about EEPROM. You forgot that how to erase an EEPROM. Good Works

[MegaJefflin]

That's an amazing and simple tutorial, I finally understand eeprom

[bigheat]

Great video. Short, precise, nice. Thank you.

[colindgrant]

Simple logical and concise. Nice video, thanks.

[elyesmehri]

For those who received 255 value returned, this is the new code i did fixed it, you just have replace some instructions with data byte ..

#include "Wire.h"

#define EEPROM_I2C_ADDRESS 0x50

void setup()
{
Wire.begin();
Serial.begin(9600);

int address = 0;
byte val = 110;

writeAddress(address, val);
byte readVal = readAddress(address);

Serial.print("The returned value is ");
Serial.println(readVal);


}

void loop()
{

}

void writeAddress(int address, byte val)
{

Wire.write(byte(0x00));

Wire.write(val);
Wire.endTransmission();

delay(5);
}

byte readAddress(int address)
{

char rData ;



Wire.write(byte(0x00));
Wire.endTransmission();

Wire.requestFrom(EEPROM_I2C_ADDRESS, 1);

rData = Wire.read();

return rData;
}

[sujanmahmud]

Thank you for the great tutorial, it really inspired me to work on the similar chip i found from a broken car security circuit. I really like to test on the cmos serial eeprom from ATMEL 93C46 using your method and the datasheet.

[P_Manom]

Your valuable tutorial helps a lot. Many many thanks.

[Golubnich]

Hi! Is there any difference between programming this eeprom chip and 24LC01B?

[DasIllu]

Oh hey, there is a little mix up which may cause some confusion. MSB & LSB are the wrong terms (somewhere around minute 5:00 )
High byte and low byte are the terms i know for describing the two bytes you've shown. I just mention it, so people don't get confused.

[mecemodzada]

Hey, could you help me? It says 255 instead the needed value every time I try it.

[bradhollan]

I like your EEPROM video demonstration. However I am still a little bit confused. I downloaded your sketch, and wired everything up as show and it seems to work as it should. I enter the value of 110 and it returns it just fine. My question though is how do I have to change the code so I could enter value of say 750. When I try that I get a value back of 0. You mention in your video that you are reading 1 byte on the line Wire.requestFrom(EEPROM_I2C_ADDRESS, 1); How do I read the next byte to be able to enter larger numbers? Thanks

[stefano.a]

5:49 Why did you used an AND bitwise operator between an integer “address” and a number formed by all ones (0xFF)? The result should be the same “address” value, so why it would be useful? Thanks

[saipratyushapratyusha]

i dont get the output immediately after opening the serial monitor.
i get the output only after sending any character from the serial monitor.
why is that?

[ianide]

I don't want to be "that guy" but EEPROMs don't have a limit on read cycles. Write/Erase operations are what reduce the life of an EEPROM. So if you have something you want to store in EEPROM, do it... and read till the cows come home.

[ahmetselim]

what is most logical eeprom for arduino uno more than 4k sram is enough for me

[psharmahello]

Hi, I saw the datasheet and should't the address be 0xA0 for write and 0xA1 for read ? So it is 0b 1010 0000, why did you write 0x50 & 0x51 ?

[خالدباشميل-بو]

I try make this tutorial but I use EEPROM 24C08A and use same the code in this video and result in serial print "the returned value is 255"
why don't get this message "the returned value is110"

[davidbolha]

Hi,

Could you use the Arduino to reset/reprogram various BQXXXX ICs that are usually found in laptop batteries ? 🤔😕

Thanks &....

Best Regards,

[WearenerdsShop]

Hi but with this programm i can write 24C64?

[robostudio]

Hi, I have a 24 LC 64 chip and I also receive only 255 as a return value. Are there any other tips around than those below? Switching pin 7 to 5v does not work