Hardware features of current design

ON-Off toggle Switch.
2 x DS18B20 aviation connectors, for long lead DS18B20 heat sensors to measure telescope temperature.
2 x Celestron Thermistor 3.5mm Jacks, for the Celestron Thermistor Sensor to measure telescope temperature, compatibility for the celestron SCT dew heater ring.
Nextion 4.3" Intelligent Touch Screen HMI.
2 x PWM Mosfet driven heaters on female RCA plugs, isolated mosfet driver.
12v input Aviation Connector (8 to 10A recommended).
1 x 12V 5mm female jack plug output (1.5A).
Current Sensor.
ASCOM on RF serial communication.
BME280 Thermal, Humidity, Pressure sensor.
12 to 5 v - 5 amp DC-DC converter for the 5V side.
Teensy 4.0 processor.
Piezzo speaker
2 X internal I2C, 1 x SPI PCB pads broken out
2 x 5v Serial, 2 x 3.3v serial
Very high standard dual colour 3D printed case, PETG and PLA Carbon Fibre
Rear 5V PWM driven cooling fan
Serial RF output (115200 Baud)
32 Channel GPS (9600 Baud)

Possibilities for hardware expansion

GPS module, ADDED
I/O Expanders both I2C and SPI for extra I/O, LED's, Buttons
I2C Keyboard, Rotary Encoders
RF & Bluetooth modules, ADDED
I2C, SPI or Serial Rain Sensor, Cloud Sensor, ADDED
I2C RTC (DS3232), PRECISE TIME/LOCATION NOW TAKEN FROM GPS
SPI A2D converter for Buttons, Potentiometers and Toggle Switches
A 5V USB PWM controlled Dew Heater Output
Extra I2C or SPI mini Oled screen
PWM controlled stepper motor driver
Customisable 3D printed case, either mono or 4 colour options, DONE
Customisable 3D printed mounting options, DONE
Your own 3D printing materials (if you choose to print the casing yourself)
Alternate electrical components (limited to case design)
Nextion I/O and Buttons expansion module (Controllable directly from the nextion)
Nextion Audio, ADDED
ASCOM Drivers for NINA, ADDED
Remote Monitoring and Control, ADDED
12V 1.5A through port, ADDED