I'll help you create code for a Raspberry Pi Pico to read data from a Morningstar ProStar charge controller via RS-232 and send it to a Signal K server over WiFi.I've created a complete MicroPython program for your Raspberry Pi Pico W to bridge the Morningstar ProStar charge controller to your Signal K server. Here's what you need to know:

Key Features:

• Modbus RTU communication with ProStar via RS-232
• WiFi connectivity to send data to Signal K server
• Multiple parameters monitored: battery voltage/current, solar panel voltage/current, temperatures, charge state
• Automatic scaling of raw Modbus values to real units
• Error handling and CRC validation

Setup Instructions:

1. Hardware connections:

   • Pico GP0 (TX) → RS-232 board RX
   • Pico GP1 (RX) → RS-232 board TX
   • Connect grounds and power

2. Configuration (update these in the code):

   • WIFI_SSID and WIFI_PASSWORD
   • SIGNALK_HOST - IP address of your Raspberry Pi 4
   • PROSTAR_ADDRESS - Modbus address of your ProStar (default is 1)

3. Install MicroPython on Pico W (download from raspberrypi.com)

4. Upload the code using Thonny IDE or similar

5. Signal K Server Setup on your Pi 4:

   • Ensure Signal K is accepting PUT requests
   • Data will appear under electrical.batteries.house and electrical.solar paths

Notes:

• The ProStar uses Modbus RTU protocol at 9600 baud
• Data is read every 10 seconds (adjustable via READ_INTERVAL)
• The code includes proper Modbus CRC checking
• Temperature is converted to Kelvin for Signal K compliance

Would you like me to add any specific features, such as MQTT support, data logging, or different update intervals?