I am trying to run a project on batteries with NANO and gsm sim800l. The purpose of the project is to display the temperature in a room with blynk (History graph). I want the arduino nano to sleep most of the time and sim800L to be powered off and only 2 to 3 times a day arduino will wake up power on the sim800l and send the temperature.
I tried with some sleep options in arduino but i failed. Can you please advice?