Hello Germ¨¢n,
??? You can just connect the two RX/TX pins on the ATU-100 board directly to the TX/RX pins on your Arduino. There's no need for the RS232/TTL adapter.
??? Programming the PIC isn't more difficult than Arduino. The main difference is that the Arduino framework hides a lot from the user (microcontroller oscillator setup, for example) and the whole ecosystem (libraries) is much vaster.
??? I would suggest you to not use MikroC and just download and install Microchip's MPLAB and XC8. There's build instructions on .
??? I plan to just use RS485 as it's way simpler than Ethernet and doesn't require much additional hardware. Anyway, there's TTL/Ethernet or TTL/WiFi devices available. Maybe there's no need for you to create your own module. Unless you want to do stuff like hosting a webpage where you can monitor and control the remote tuner.
??? There are some cheap TTL to RS485 modules available like:
??? And there's also lot's of USB to RS485 modules. Both cheap and industrial grade.
??? Maybe in the future I could implement something like ModBus. Using a standard communication protocol that can travel via TTL, RS232, RS485, Ethernet, Wi-Fi etc can be nice.
??? 73
