May be it's help you - in my case with Winbond W25X40CL changing code in SPIFlash.h solve the problem with CRC error:

i change this:

#define SPIFLASH_BLOCKERASE_32K   0x52        //!< erase one 32K block of flash memory

on this:

#define SPIFLASH_BLOCKERASE_32K   0xD8        //!< erase one 64K block of flash memory

@yveaux Sorry, i don't test the range of nodes - plan to use in the 2 floor house of 60 meters.
But you opinion is correct, this design is compromise of size, pins count and range degradate.
This is prototype, work good about 1 year:

@feanor-anglin said in Newbie wants to do everything wired:

If you like it, please feel free to contact me. We've made some significant progress, which is not published yet.

I am also intresting in implementation of RS485 in my MySensors network, and i like yor hardware and use some of your ideas in my project Simple compact RS485 node (ATmega328 + MAX485) ,

As i see, two first module is impulse, but third - linear?

Most likely you are right, nevertheless, all my simple devices are working correctly, the only problem that I have encountered is a problem when flashing some controllers through the USBASP.

@dzjr Congrats! My works on hobby is not hard because of we have nice weather too

@dzjr This is terrible, but yesterday I received a message from PSBs.io that my order from 04/13/2020 is only sent ..

@dzjr I am ordered a new revision of this PCB at 2020.04.13, and the order status is "in fabrication" too, don't worry.

@dzjr I am using simple solder station like 936 with 900M-T-I iron tip, first solder the MCU and pin-headers, programm with USBASP using pads SCK, MISO, MOSI, RES, VCC ang GND, then solder other components (MAX485, resistors and capacitors).

@dzjr Ordering PCBs you will get only pcb, without components (no matter - SMD or TH). You may use PCB assebling service like JLCPCB or other, or you may solder SMD components yourself, it is not so hard, as you can think.

@dzjr I can upload new revision, but it still not tested in hardware, only ready to place order for PCB!

Soon a new revision of the board with the possibility of installing memory for OTA and fix some components footprints will be ready.

@VonJoost I see in serial console about the same picture - dump is 000000....

May be it's help you - in my case with Winbond W25X40CL changing code in SPIFlash.h solve the problem with CRC error:

i change this:

#define SPIFLASH_BLOCKERASE_32K   0x52        //!< erase one 32K block of flash memory

on this:

#define SPIFLASH_BLOCKERASE_32K   0xD8        //!< erase one 64K block of flash memory