A normal potentiometer is connected to AN4 Analog channel so feed in variable voltage, this variable voltage will be used as the data to be saved in the EEPROM. We have interfaced an LCD to visualize the data getting saved and retrieved.
The circuit diagram for the project is shown above. Now let us see how we can use these 256 bytes to read/write data by using a simple experimental setup.
In our case for PIC16F877A the available space is 256 bytes as mentioned in its specification datasheet. The amount of storage space available in EEPROM varies upon each microcontroller the details will be given in Datasheet as usual. The data saved in this will be erased only if it is mentioned to do so in the program. As the name suggests it is a memory present inside the PIC Microcontroller in which we can write/read data by programming it to do so. If you haven’t learnt the previous tutorials then it would be better to have a look at them now, because this tutorial assumes that you are familiar with Interfacing LCD with PIC Microcontroller and Using ADC with PIC Microcontroller.ĮEPROM stand for “Electronically Erasable and Programmable Read Only Memory”. This PIC EEPROM tutorial is a part of a sequence of PIC Microcontroller Tutorials in which we started from a very basic level. But we can avoid those tiring process if the data is small, we can simply use the EEPROM present in the PIC Microcontroller to save our data and retrieve it at anytime we want. If the data is large in terms of Mega bytes then we can interface a storage device like an SD card and store those data on them. This might sound like a complicated process, but with the help of XC8 Compiler this task can be done by just using a single line of code. In most real time projects we might have to save some data which should not be erased even when the power is turned off.
In this tutorial we will learn how easy it is to save data using the EEPROM present in the PIC16F877A Microcontroller.
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