EEPROM EV24C512A + ESP8266

Zengzhong · 发表于 2024-6-23 16:35:19

Software ConfigurationRequired Libraries:

Wire.h for I2C communication.
ESP8266WiFi.h for Wi-Fi functionality.

Sample Code:

cpp

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#include <Wire.h>
#include <ESP8266WiFi.h>

#define SDA_PIN 4 // GPIO4
#define SCL_PIN 5 // GPIO5
#define EEPROM_ADDRESS 0x50 // Default I2C address for EV24C512A

void setup() {
  // Initialize I2C communication
  Wire.begin(SDA_PIN, SCL_PIN);

  // Initialize Serial for debugging
  Serial.begin(115200);

  // Initialize Wi-Fi
  WiFi.begin("yourSSID", "yourPASSWORD");
  while (WiFi.status() != WL_CONNECTED) {
delay(1000);
Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");

  // Example: Write data to EEPROM
  writeEEPROM(0x00, 0x42);

  // Example: Read data from EEPROM
  byte value = readEEPROM(0x00);
  Serial.print("Read value: ");
  Serial.println(value, HEX);
}

void loop() {
  // Your main code
}

void writeEEPROM(int address, byte data) {
  Wire.beginTransmission(EEPROM_ADDRESS);
  Wire.write((int)(address >> 8)); // MSB
  Wire.write((int)(address & 0xFF)); // LSB
  Wire.write(data);
  Wire.endTransmission();
  delay(5); // EEPROM write delay
}

byte readEEPROM(int address) {
  Wire.beginTransmission(EEPROM_ADDRESS);
  Wire.write((int)(address >> 8)); // MSB
  Wire.write((int)(address & 0xFF)); // LSB
  Wire.endTransmission();
  Wire.requestFrom(EEPROM_ADDRESS, 1);
  if (Wire.available()) {
return Wire.read();
  }
  return 0xFF; // Return 0xFF if nothing is read
}

Explanation:

Wire.begin(SDA_PIN, SCL_PIN) initializes the I2C communication on the specified GPIO pins.
WiFi.begin("yourSSID", "yourPASSWORD") connects the ESP8266 to your Wi-Fi network.
The writeEEPROM and readEEPROM functions handle writing to and reading from the EEPROM.

Ensure you have the ESP8266 and Wire libraries installed in your Arduino IDE. Adjust the GPIO pins if needed, depending on your specific ESP8266 module and pin configuration (Espressif) (Espressif).

Schematic Diagram:Components:

ESP8266 (ESP-12E module)
EV24C512A EEPROM
Pull-up Resistors for I2C lines (4.7kΩ)
Capacitor for power supply stabilization (0.1μF)

Schematic Connections:

scss

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                     +3.3V
                     |
                     [ ]
                  0.1μF
                     |
                     +-------+
                     |    |
                     (Vcc) (GND)
                     |    |
+3.3V----->Vcc GND----->GND
   |                   |
[4.7kΩ]                |
   |                   |
   +-------+             |
         |             |
         (SCL)          |
         |             |
         [4.7kΩ]       |
         |             |
         (SDA)          |
         |             |
         +--------------+
                     |
                     |
                     (A0) --+-- (A1) --+-- (A2)
                     |             |
                     (GND)       (GND)

            +-------------------+
            | EV24C512A EEPROM  |
            +-------------------+
                        |
                     (WP)
                        |
                     (GND)

Detailed Pin Connections:

EV24C512A to ESP8266:
- Vcc to ESP8266 Vcc (3.3V)
- GND to ESP8266 GND
- SDA to ESP8266 GPIO4
- SCL to ESP8266 GPIO5
- A0, A1, A2 to GND (Setting default address)
- WP to GND (Disabling write protection)
Pull-up Resistors:
- SDA to 3.3V via a 4.7kΩ resistor
- SCL to 3.3V via a 4.7kΩ resistor
Capacitor for Power Supply Stabilization:
- Connect a 0.1μF capacitor between Vcc and GND near the EEPROM for power supply noise filtering.

Notes:

The pull-up resistors are necessary for proper I2C communication.
Ensure the power supply is stable and within the voltage specifications of both the EEPROM and ESP8266.
Double-check the connections to avoid damage to the components.

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www.evashtec.com

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