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Now, time to install the Nexstar GPS program code into the Arduino. This requires a 5V TTL serial-to-USB cable or adapter.

The Vcc, GND, RXI, TXO, and RTS/RESET pins need to be connected for this to work. There will be one pin left over, usually an extra GND pin.

If the serial adapter also has a CTS wire, just leave it unconnected.

Plug the USB end of the adapter into your PC. The Arduino's RED power LED should light up. If not, quickly unplug it and find/fix the wiring error before trying again.

Now you can fire up the Arduino IDE, load the nexstar_gps.ino program ("sketch"), and select "Arduino Pro Mini" from the "Boards" sub-menu. Compile and send the code to the Arduino. The LEDs on the serial adapter should be blinking for many seconds during the transfer.

When done, leave the serial cable still connected at both ends, and press the "Reset" button on the Arduino board. The onboard LED should blink three times at half-second intervals, confirming that it is indeed now running the nexstar_gps code.
Now, time to install the Nexstar GPS program code into the Arduino. This requires a 5V TTL serial-to-USB cable or adapter.The Vcc, GND, RXI, TXO, and RTS/RESET pins need to be connected for this to work. There will be one pin left over, usually an extra GND pin.If the serial adapter also has a CTS wire, just leave it unconnected.Plug the USB end of the adapter into your PC. The Arduino's RED power LED should light up. If not, quickly unplug it and find/fix the wiring error before trying again.Now you can fire up the Arduino IDE, load the nexstar_gps.ino program (sketch), and select Arduino Pro Mini from the Boards sub-menu. Compile and send the code to the Arduino. The LEDs on the serial adapter should be blinking for many seconds during the transfer.When done, leave the serial cable still connected at both ends, and press the Reset button on the Arduino board. The onboard LED should blink three times at half-second intervals, confirming that it is indeed now running the nexstar_gps code. (serial_cable_wiring)
serial_cable_wiring (14/22):
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