Hello mfalkvidd,

Thanks for your swift reply.
IDD i do not need exact timer for sending the sensor data So I will change to yours script.
Still interresting howe to have the arduino, RTC , sensor and nRF24 sleeping?
External signal means one of a divice must be on all the time and consume current.
I check your script and come with feedback.
Thanks,
ilioSS

Good day,
As newbee in Arduino land.
I wants to read the outside temp, hum and air-press by means of a nRF24L01 a BME280 with a arduino pro-mini and a RTC DS3231 a solarcell aprox. 6 to 8 Volt and 250mA a battt. LiPo 2400mA/3,7V and a batt. charger ??? with the following number 03962A
it has a USB connector a batt. connector and out + and - it works with a bleu LED if batt. is chatrged and a red LED if not and power is connected by means of the solarcell or batt.

My question is the following;
I would like to run the outside unit as described above on the solacel and batt.
This means the whole set needs only send the data lets say ones a ten minutes.
This can be done by the use of sleep modes for the arduino it looks clear to me.
But the sensor and ther RTC howe about these?
The Nick Gammon and the article to remove the LED and voltregulator on the Arduino is known.
For me not clear is the sleep for the RTC and the sensor. This I would like to have clear before I will swap to the MySensor lib. and scripts.
Now my set-up is working.

Like to hear.
ilioSS