Hi, time to share the results from my first long running tests over the last couple of months.
I had two MRKWAN1300 running with the MKRWAN library plus the ArduinoLowPower Library to put them to SLEEP after sending, and then they had the sensor libraries on.
They were both powered by 2 AAA (not AA) standard Duracell batteries.
The question I tried to answer for myself was: how far would I get?
- The first device with an AM2305 (DHT22 library) reached a round 5000 uplinks in both cycles.
- The second, having an Si7021 attached (via I2C) sent 19000 in the first and 16000 uplinks in the second run.
Based on the result I take it, I2C sensors are more efficient in terms of power consumption. To be honest I did not do much checking yet around the DHT22, maybe there’s a way to tune its power consumption.
Note: I saw that some people are doing great research about the power consumption of the board on a hardware level (MKRWAN1300 high current in sleep mode), really curious to see if a V2 is going to be launched soon.
Now, to answer the question above: in best case assuming a reasonable scenario where the device is sending max. 140 messages per day it would - mathematically - run for about 3 month. Not too bad, but if it was double I would be more satisfied 