@iguaan Try to set MY_RF24_PA_LEVEL to RF24_PA_MIN on gateway then use NRF24L01+PA+LNA module - in my case the OTA begin work perfect!

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

@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) ,

You can use anything like this:

https://electronics.stackexchange.com/questions/129463/switch-on-computer-with-microcontroller

i am using just one PC817:

@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:

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

@kiesel Great work!

1. 5V connected through diode to protect of polarity revers
2. MB = Motherboard, you right
3. First need to connect power button from front panel, second to connect to "Power Switch" on motherboard. This allows power on both from power button and Arduino.

You disign is absolutely working!

Very dangerous - too small gap between AC230 and GND:

@kiesel Sorry friend, I guess I confused you a little ..
The diode is needed so that, when powered from the contacts on the motherboard with 5V, it does not damage my arduino, that's all
Have a nice weekend to!

@vdomos it is possible to connect the ground wire of the RS485 adapters?

@vdomos this is very strange - it works for me without this directive..

#define MY_BAUD_RATE 9600
#define MY_NODE_ID 111
//#define MY_PARENT_NODE_ID 0
//#define MY_PARENT_NODE_IS_STATIC

#define MY_DEBUG

#define MY_OTA_FIRMWARE_FEATURE
#define MY_OTA_FLASH_SS 16  //  pin A2 of Arduino Pro Mini
#define MY_OTA_FLASH_JDECID 0xEF30

#define MY_OTA_RETRY (10u)
#define MY_OTA_RETRY_DELAY (2000u)

#define MY_RS485
#define MY_RS485_DE_PIN 7
#define MY_RS485_BAUD_RATE 9600

#include <SPI.h>
#include <MySensors.h>

void setup()
{
  pinMode(6, OUTPUT);
}

void before() { 
}

void presentation()
{
  sendSketchInfo("Test_RS485_OTA", "2.3.2.0.004");
}

void loop()
{
  digitalWrite(6,0);
  wait(100);
  digitalWrite(6,1);
  wait(100);
  digitalWrite(6,0);
  wait(100);
  digitalWrite(6,1);

  sendHeartbeat();
  wait(5000);
}

I want to share an interesting case about updating the firmware over FOTA..

I have several nodes on a RS485 bus with memory chips.
Recently I decided to update the firmware on several at once and ran into an unexpected problem - repeated attempts to update constantly ended up with a checksum error !OTA:FWP:CRC FAIL.

At the same time, I usually test all new nodes for FOTA firmware updates before installing.

I tried to understand what the problem might be and came to an unexpected result - in my case, disabling the directive OTA_EXTRA_FLASH_DEBUG, which I had been using for a long time, when I first tested updates, helped.

After disabling this directive, all firmwares were updated the first time. Very strange, but nevertheless ...

@gryzli133 I have a number of MySensors devices using RS485, it would be interesting to try to run PJON protocol over RS485, it seems like there is such an opportunity, but I could not figure out how to use it in the MySensors library.

like this

send(msgPir.setSensor(Number).set(State?"1":"0"));

@Flyer Do you can ping the gateway on it IP?

@skywatch May be you right - the distance between node and gateway so small..
But how can i solve the problem of unstable link with node on distance about 5m and more with wall between node and gateway?

@skywatch Yes, FOTA works with both modules, it is one gateway, i just change one module (black) to another (Ebyte), distance between gatway and node aprox 2-3m.
I want to find a solution to increase distance, because of some of my node work unstable..

@skywatch The peoblem is in not working OTA with NRF24-PA-LNA, if the RF24_PA_LEVEL parameter has not the RF24_PA_LOW value..
It's refers to Ebyte module too..
The power supply is the brand Samsung power adapter for the tablet and the LM1117 3.3V with 100uF capacitor.

@skywatch I am using this module

and like this