ESP-Phone

A simple way to turn two ESP8266 devices into interactive communication devices using ESP-NOW. This project includes a built-in web server to pre-make phrases and is built for the LCD1602 with an I2C backpack.

Features

• Real-time communication between two ESP8266 devices
• Web server for pre-saving phrases
• LCD display for message viewing
• Built-in message saving and deletion
• Simple and intuitive user interface
• Efficient, low-power communication using ESP-NOW

Planned Features

• Retransmission: If a message is sent and the peer is not within reach, the device will keep retransmitting the message until it is acknowledged (persists reboots).
• LoRa: LoRa for extended range.
• Keypad_I2C: Support for 4x3 Matrix Keypads via an I2C expander like PCF8574.

Hardware Requirements

• Two ESP8266 devices
• LCD1602 with I2C backpack
• Push buttons (4)
• LEDs (2)

Pinout

Function	Pin
LCD SDA	D1
LCD SCL	D2
Display Button	D3
Up Button	D5
Down Button	D6
Enter Button	D7
Blue LED	D8
Red LED	D4

Getting Started

Prerequisites

• ESP8266 board package installed in Arduino IDE
• Arduino IDE installed
• ESP8266WiFi library
• ESP8266WebServer library
• espnow library
• Wire library
• LiquidCrystal_PCF8574 library
• FS library

To Get Started

Device MAC Addresses

1: 0xA0, 0x20, 0xA6, 0x1A, 0xA3, 0x13 (AP1 TARGET MAC)

2: 0x8C, 0xCE, 0x4E, 0xCB, 0x0A, 0xF0 (AP2 TARGET MAC)

Identify MAC Addresses

1. Upload the following code to your ESP8266 devices to identify their MAC addresses:

#include <ESP8266WiFi.h>

void setup() {
  Serial.begin(115200);
  Serial.println();
  Serial.print("ESP Board MAC Address:  ");
  Serial.println(WiFi.macAddress());
}

void loop() {
}

2. Open the serial monitor: Tools > Serial Monitor or Ctrl + Shift + M
3. Copy the MAC address and take note.

Tip: Label your devices to keep track of them.

4. Copy the MAC address of the peer device into Line 68 of the main code file in this repository.
5. Change SSID and Password on lines 10 and 11.

Tip: Set a unique SSID for each device.

Usage

1. Power on your ESP8266 devices.
2. Connect to the WiFi network created by the devices.
3. Access the web interface by going to http://192.168.4.1.
4. Use the web interface to save or send messages.

Troubleshooting

1. Ensure both devices are powered on and within range.
2. Check the serial monitor for error messages.
3. Verify that the MAC addresses are correctly configured.

License

This project is licensed under the MIT License - see the LICENSE file for details.

Acknowledgments

• Rui Santos & Sara Santos - Random Nerd Tutorials

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Happy building!