This is RS485 version of a simple node on Atmega328
Awaiting PCB from fabrication. !!! Not tested in hardware !!!
D7 pin used for control RS485 DE/RE input.
On long side of board present 11-pin header include:
On short side of board present two pin header include:
On bottom side of board present MISO, MOSI, SCK and CSN for programming bootloader to ATmega328.
Present place to solder pull-up resistors for RES, D2, D3, SDA, SCL signals.
It is also possible to install LED connected between D6 pin and 5V through 510Ohm resistor.
You can order PCB from (not tested in hardware yet) PCBs.io - 4pcs for $4.65, black 1.6mm PCB