@Achim looks like a mistake in BOM (maybe that aliexpress listing has changed). Project uses same relay, but 5V version is needed.

@ludoarchi

@ludoarchi said:

2/ what are the pins 7 GND and 4 for ?

7 and 4 pins are mapped to 7 and 4 in/out of an arduino module. GND is for ground. These pins could be used to manually control relay state.

@hek

@hek said:

You can disable this behaviour by defining:

#define MY_TRANSPORT_DONT_CARE_MODE
#define MY_PARENT_NODE_ID 0

Tried it. Doesn't work. Btw, I searched all mysensors sources (2.0) and didn't find any use of a MY_TRANSPORT_DONT_CARE_MODE definition.

@hek

@hek said:

You can disable this behaviour by defining:

#define MY_TRANSPORT_DONT_CARE_MODE
#define MY_PARENT_NODE_ID 0

This is a really good news, I'll give it a try to check if it works correctly with controller and when controller is lost.

@okos Unfortunately current mysensors version won't allow to 'boot' your code before their module connects to a controller. This is a main reason I moved to ESP8266 hardware.

I bought here in Ukraine circular-shaped slow-blow fuses and soldered them almost normally (here is their datasheet http://www.rcscomponents.kiev.ua/datasheets/5rt.JPG), so far everything is ok.
And here is my board instance:

I found out, that reset of a node, which is built with mysensors 2.0 blocks all startup and loop execution (rendering node unusable) if there is no controller present or radio fails for some reason.
Is there any workarounds or documented methods to make node working, while mysensors library tries to connect to controller?

@Nca78 you're right, my FTDI was at 3.3v after experiments with ESP8266. With 5v everything works as expected.

@dpressle my experience shows, that this PCB works fine with LE33 when powered from mains, however nrf fails to receive data, when powered from FTDI through arduino.

I updated source file for this module, so it supports MySensors 2.0 now and sends temperature data too. You can pick it at my github page. Total size for 'Arduino Pro or Pro Mini w/ ATmega328 (5V, 16 MHz)'
Program size: 13 396 bytes (used 44% of a 30 720 byte maximum) (2,78 secs)
Minimum Memory Usage: 614 bytes (30% of a 2048 byte maximum)