Bill Of Materials

Details on parts to build your own. Under construction

As long as the ESP32-S3 CPU module of choice has enough output pins, either natively or through an i2c extender module, and it has at least one USB port that supports OTG, it should be usable.

Displays: You can have no display, or an OLED (SSD1306 128x32 is used here), or the color LCD in the M5AtomS3. You can add in your own display code if you want something different. There is not a lot of info as this is just a basic band decoder. It may be tucked away in a back seat of a vehicle or on a tower top and never to be seen.

IO pins: There is no reason you can't change the total number of IO pins as long as your hardware has the pins. The decoder code can be extended. Adding 2 more pins to each group (Band Select and PTT groups) is the easiest to do. Adding another group of 8 would be the next step. I have other Band decoder project that already support more pins, on several IO devices, this is a more targeted and simplified project starting out with 6 pins per group to match the IC-905's 6 bands.