-- Factroy reset doesn't work; need to test again. 10K pull-up is too high?
-- Lipo voltage ADC sensing
-- Lipo charger configuration: fast charge time: USB charger spec?
-- Low voltage alarm: LED indcates voltage of Lipo
-- CTS/RTS lines are needed? just connect in loop back if no flow control is needed.
-- CTS is needed for waking up from deep sleep?
-- Serial API callback when data are available/received(and when send buffer is available)
-- Serial API instance several serial ports can be used
-- DCDC converter: squeaky inducter with onsemi NCP1402
-- Lipo charger MCP73831: needs capacitor 4.7uF *2
+
+Testing:
+- Factroy reset doesn't work; need to **test again** 10K pull-up is too high?
+- Lipo voltage ADC value is not stabilized
+- DCDC converter: squeaky inducter; try other inductors
+