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Topic: basic read code, I think it works (Read 733 times) previous topic - next topic


This seems to give me some results with a scavenged Amtel 24C04, pins 1,2,3 & 4 to Gnd, 8 to Vcc(+5v), 7 to Gnd*, 5 (SDA) & 6 (SCL) to pin 2(SDA) & 3(SCL) respectively, on an Arduino Micro, on a breadboard with a 5v IC (KIA7805PI) powered by a 9v Battery

On the 24C04, pins 1,2,3 are A0, A1, A2, to set the address (7bit, starting at 0x50), 4 Gnd, 5 Sda, 6 Scl, 7 is tied to Gnd for write (or Vcc (+5v) for write-protect) and 8 is Vcc (+5v)

The Arduino Gnd & VI (Voltage Input / Reference) are connects to the 7805 Gnd and +5v pins respectively.

This might be some help  http://www.arduino.cc/playground/Code/I2CEEPROM

I need to do a write then read it to see if it's really working correctly... if anyone sees anything wrong let me know.


#include <Wire.h>

void setup()
  Wire.begin();        // join i2c bus (address optional for master)
  Serial.begin(9600);  // start serial for output

void loop()
  Wire.requestFrom(0x50, 1);    // request 6 bytes from slave device #2

  while(Wire.available())    // slave may send less than requested
    char c = Wire.read();    // receive a byte as character
    Serial.print(c);         // print the character



The code does not write.
And I think you should write the address (the register address inside the EEPROM) first, before you can start reading.
You request 1 byte, and in the comment it says 6 bytes.

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