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How to Connect a 24LC256 EEPROM to an Arduino

For more information please read http: Now all we need is the code. Check out our videos Follow us on: Next we have to send the address on the eeprom we want to write to. The pinout of this chip is shown below. Next, we have our setup function. So this is what we will use for this circuit.

In this circuit, we’re not interested in disabling the write feature. This means our 24LC chip gets the address and then which tells it to store the next byte in address location 20, The 24LC gets the data and writes the data to that address location.

24LC Serial I2C EEPROM K | Microchip

The last pin, the WP or Write Protect pin connects to ground. This variable is not required but it allows us to easily change the address we want to access without going through all of the code and replacing the value.

Time to move on to software! To illustrate this lets follow the steps below. These are the hardware connections.

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However, there are times where it may be very necessary. The clock is used to synchronize data transfer to and from the device between the arduino microcontroller and the EEPROM chip. Below is the entire tutorial code, scan over it and see if you understand it before I dive into what each section does.

We then create a for loop where we write out 5 ‘2’s representing a zip code. In most other kinds of non-volatile memory, this can’t be done.

How to Connect a 24LC EEPROM to an Arduino

This establishes a clock line so that the master and slave device can work in synchrony. The SDA pin, pin 5, is the serial 24lc25 pin. We will ground all the address pins.

The next function requestFrom sends the command to that chip to start sending the data at the address we set above. The WP pin, pin 7, is the Write-Protect pin. Therefore, we put all the functions in the setup function and not in the loop function.

If you are using Arduino 1.

This produces an address of This tutorial was originally posted on the 10kohms. We then have a for loop, but it contains nothing because a for loop repeats itself over and over again.

If you are going to connect more than one 24xx EEPROM to a microcontroller, you will need to vary the addresses of each of the pins. However, if the address pins wereit would be 0x We then call a for loop reading this value. First, to power the chip, we connect V CCpin 8, to 5V.


Arduino Sketch Below is the entire tutorial code, scan over it and see if you understand it before I dive into what each section does. Next we start off just like we did with the write function by starting the process with beginTransmission and then we send the address we want to access; this works exactly the same way as the write function. Before we get into the software part lets hook up the 24LC chip up to our Arduino. For the purpose of explaining how the address works we can ignore the Start and Acknowledge bits.

If it wasit would be 0x This means you can turn off a device, keep it off for 3 days, and come back and turn it on and it can still run the program that was programmed in it. Since this is I 2 C communication, we have 2lc256 create a Wire object. The breadboard circuit of the circuit above is shown below. Then connect the SCL pin 6 to pin 5 on the Arduino.