@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!

It has long been known, that the NRF24 module with PA-LNA work strangely, if the RF24_PA_LEVEL parameter has not the RF24_PA_LOW value.

I decided to study the issue a little and found such a parameter in the registers of the NRF24 chip settings - "LNA gain":

"6.5 LNA gain
The gain in the Low Noise Amplifier (LNA) in the nRF24L01 receiver is controlled by the LNA gain setting. The LNA gain makes it possible to reduce the current consumption in RX mode with 0.8mA at the cost of 1.5dB reduction in receiver sensitivity.The LNA gain has two steps and is set by the LNA_HCURR bit in the RF_SETUP register."
(see nRF24L01 Single Chip 2.4GHz TransceiverProduct Specification)

I see this setting in RF24registers.h:

#define RF24_LNA_HCURR		(0)

May be here I may use "1" for module with PA-LNA?

#define RF24_LNA_HCURR		(1)

@kiesel Yes, you rigth - between 3.3V on mainboard and VCC of arduino!

@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!

@kiesel See for example this for understand the idea:
https://www.allaboutcircuits.com/technical-articles/how-to-protect-your-circuits-using-only-a-diode/

@kiesel I don't undestand - why you want to use diode between 3.3V and GND?
About resistor on the mainboard side - i don't use it and all works fine

@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!

You can use anything like this:

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

i am using just one PC817:

What about RS485 bus topology and connection to RS485 recievers on Arduino Pro Mini module?

@skywatch Don't worry - in my case it doesn't matter, because the plug can be inserted into the socket on both sides

I am using the same power supply in one of my device (dimmer for aqua LED lamp)- it work good..