Cannot use radio transmitter after switching to LowPower library about low-power

[lukas12p]

Try do float temp = dht.readTemperature(); twice with 1000msec delay to wake up dht.

[ribtoks]

@lukas12p I will try, but so far I assume reading temperature works, but sending data with radio does not work. I log all radio signals on the receiver side so if the temperature reading would fail - it would just log some garbage.

Maybe I just need to insert delay(1000); after power sleep to wake up everything?

[rocketscream]

Yes, you should dd the delay(1000) after sleep and probably before sleep too. I believe the DHT sensor needs some time to stabilize after waking up. You can also replace the transmission data with a known constant to prove this.

[ribtoks]

@rocketscream will try, thanks!

[ribtoks]

@rocketscream do I need to "reinitialize" radio module and DHT22 after power-down sleep? Is it equal for them as if you would just turn them off? I mean do I need to rerun setup() after low-power sleep?

[rocketscream]

I have never use that radio module nor the DHT22 before but by right it shouldn't and will not mess anything related to it by going to sleep. Have you try removing the sensor portion and simply sending known constant data with the radio?

[ribtoks]

Adding delay(1000); before and after power-down sleep and setup() call after this delay made the sensors work again.