Afterburner operation checklist
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Modifications performed:
  Pullup on Debug Rx line
  Swapped GPIO In#1 with Analogue input
  5V via blocking diode to GPIO port
  
OLED intact
Latest firmware uploaded
SPIFFS uploaded
Keypad functions OK
Indicator LEDs function
Web server functions and serves heater control page
Bluetooth pairs and streams SPP data
GPIO functions:
  Input x2
  Output x2
  Analogue