I ordered a few of the v1.1 boards from this URL
I'm using an RN2903 (f/w from 0.8.4 Feb 2017) with a Wemos
D1 mini using software serial to communicate with the Lora chip.
The device functions well but I can't seem to figure out why it is
consuming 5ma when it enters deep sleep. If I disconnect the
D1 from the board and power it I can see that power consumption
drops to 0 when it enters deep sleep. I tested deep sleep with it
disconnected from the board and it works as expected. Sleeps
drawing very little current and wakes fine.
I know the RN2903 uses about 2-3 ma when idle. It to drops to
zero when it enters deep sleep. However, when I mate the D1 to the
board, the total sleep current is around 5ma.
I'm wondering if in the process of going into deep sleep the D1 using
software serial is somehow waking the RN chip up ? Still, the RN only
uses 2-3 ma, so I'm at a loss at why this is using so much power.
I'm powering the device using the 3.3V input on the board. Given the
high sleep current I'm only getting 20 days or so use with my 3200ma
Any ideas or hints on how to debug this would be appreciated.