Does anyone know if the deepsleep shield impacts the operation of the LiPo charger on the Expansion Board? i.e. if this is enabled, does it disable the LiPo charger onboard?
I just tested this. I have a LoPy on a 18650 battery (via an expansion board), with a current shunt inline to monitor battery current.
Control test: Without DeepSleep shield:
While connected to USB, I observed charging current going into the battery. If I unplug the USB, then the battery discharges: 100mA for active Wifi, 35mA w/o Wifi, and 10mA for disabled WiFi and
With DeepSleep shield:
Using the "deepsleep" library with the DeepSleep shield, and connected via USB, I put the device to sleep. The charging current for the battery was unchanged. I then disconnected the USB, and the current draw from the battery dropped below 1mA. I can't measure much lower than that with my setup.
The DeepSleep board works as expected with batteries.
I don't have a deep sleep shield yet but there really should be no problem, the deepsleep shield (like the LoPy) comes after the power multiplexer while the charger chip is before it
Interesting questions, I also would like to know the answer. If you have a Lopy that is plugged into a power source (e.g. via USB power only) and the LoPy is set to deep sleep with deep sleep shield, will an attached 3.7v LiPo battery be charged?
I don't have a deep sleep shield to test this with yet.