Sapphire ESP32 Laser Controller

A robust, web-based controller for Coherent Sapphire lasers built on the ESP32 platform. This project provides a real-time telemetry dashboard and control interface for multiple Sapphire lasers via RS232 serial communication.

Features

Multi-Port Support: Control up to 3 Sapphire lasers simultaneously (2 implemented, 1 planned).
Real-Time Telemetry: Monitor power, current, temperatures (base, diode, controller), and operational status via WebSockets.
Interactive Control: Set laser power levels and send raw serial commands directly from the web interface or USB serial.
Automatic Discovery: Smart state machine handles connection, initialization, and fault recovery for each laser port.
OTA Updates: Seamless firmware updates over-the-air using ElegantOTA.
Responsive Web Dashboard: Built-in HTML/CSS interface served directly from the ESP32.

Hardware Requirements

ESP32 Development Board
RS232 to TTL Converters: One for each laser port (Sapphire lasers use RS232 levels).
Coherent Sapphire Laser(s)

Serial Pinout

The ESP32 communicates with the lasers at 19200 baud (8N1).

Port	RX Pin	TX Pin	UART Peripheral	Notes
Serial 1	GPIO 26	GPIO 27	UART2	Primary laser port
Serial 2	GPIO 32	GPIO 33	UART1	Secondary laser port
Serial 3	GPIO 18	GPIO 19	UART1 (Remapped)	Optional/Planned

Note: GPIO 1 is used for Debug/USB Serial (115200 baud).

Software Dependencies

Ensure you have the following libraries installed in your Arduino IDE or PlatformIO environment:

ESPAsyncWebServer
AsyncTCP
ElegantOTA
ArduinoJson
WiFi (Standard ESP32 library)

Installation & Setup

Clone the Repository:
```
git clone <repository-url>
```

Configure WiFi: Open Sapphire_ESP32.ino and update the WiFi credentials:

const char* ssid = "Your_SSID";
const char* password = "Your_Password";

Flash the ESP32: Upload the sketch using the Arduino IDE or your preferred tool.
Connect Hardware: Connect the RS232 converters to the designated GPIO pins and the Sapphire lasers.

Usage

Web Interface

Once connected to WiFi, the ESP32 will print its IP address to the Serial Monitor. Navigate to this IP in your web browser to access the Sapphire Controller Dashboard.

Main Dashboard: View telemetry and control power.
Firmware Update: Access http://<ip-address>/update to upload new firmware binaries.

Serial Console

You can also interact with Port 1 directly via the USB Serial Monitor (115200 baud). Any text entered will be sent as a command to the laser on Port 1.

Protocol Support

The driver implements the Sapphire serial protocol, supporting commands such as:

?P: Read output power
?C: Read laser current
?STA: Read system status
P=XXX.X: Set laser power in mW
?FF: Read fault flags

Firmware Versioning

The current firmware version is defined in the source code. Please increment FIRMWARE_VERSION in Sapphire_ESP32.ino when making changes.

Developed for high-precision laser control applications.

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