I have finally got around to setting up a beehive scale using an Explorer and LoraWan (and it's working well!).
In the previous configuration which used an Autonomo with GPRS modem, the device slept for 1 hour, awoke and took a reading, sent it off and then went back to sleep. Once a day it synchronised the RTC with an Internet time server.
I would appreciate some help with a couple of questions about the Explorer.
1) Do I need to switch off the Lora and Bluetooth modules or does putting the board to sleep achieve this?
2) How do I get a clock sync signal via Lora to set the RTC (I'm using TTN and the CayenneLPP library). I realise that transmissions are timestamped at the gateway so it doesn't really matter, but it would be good to have the device wake up at a predictable time.
3) The coin cell battery seems to run down quickly. Am I right in thinking this is only 20mAh and perhaps rather underpowered for running indefinitely with a solar panel with only intermittent sunshine each day? The Autonomos typically went forever using a 1200mAh battery with a panel. Or does the Lora modem use so much less power than the GPRS modem that this is enough? I haven't been able to measure the current consumption yet, I've ordered an INA219 so that I can run some checks.
Thanks in advance, Andrew