i had my answer on ahtxx issue Hi, ...figured out that the _address is messed up (i guess by mysensors). It is impossible, because _address is private variable. The private data members cannot be accessed from outside the class (mysensors can not see it). Сan you try my original library but with class initialization line AHTxx aht10(0x38, AHT1x_SENSOR); //sensor address, sensor type

hi electrick, thank you for the hint, i'm so glad that someone finally talks to me :) Yes i reached the same conclusion about power supply of the nrf24 board. 3.3V pin from nano can only deliver 50mA when e01-ml01sp4 needs 120mA. I redesigned my project including a ams1117 between nano's 5V pin and the radio board https://forum.mysensors.org/topic/12109/nano-e01-ml01sp4-gateway/4?_=1679247873047 next episode when i'll receive the new pcb !

@bach It does look really great! As far of resistor divers I'm not much fan of that. There are several other options, like a logic level converter circuit with FETs. If I have all 3.3V devices connected to an mcu I prefer to use a 3.3v mcu. Like an esp2866, but I'm still waiting until the irq support on the esp2866 gets available. For me the nrf24's are still working great and I have a stacked up a lot lol. I'm however experimenting with the rfm's. As I need a bit more range to reach the end of my backyard.