Re: Help on battery saving with ESP8266, battery info
Posted: Thu Mar 17, 2016 5:49 pm
Mattia, 7mA sounds like the quiescent current of the 3V3 regulator - the Feather appears to bring out an EN pin to shut down the regulator maybe this is what you need to do https://learn.adafruit.com/adafruit-feather-huzzah-esp8266/power-management
One thing I noticed when connecting Resest to the Wake pin (GPIO16) through a resistor is that the Reset input appears to have some capacitance that takes a while to discharge (maybe 100nF looking at the CR time-constant on a scope). A direct connection to GPIO16 might therefore cause a glitch on the internal supply as the output struggles to discharge it with no current limiting. This is with a bare ESP6266-12E module. To get comfortably below the reset threshold before the pulse goes high again I'd use no more than 220 Ohms.
One thing I noticed when connecting Resest to the Wake pin (GPIO16) through a resistor is that the Reset input appears to have some capacitance that takes a while to discharge (maybe 100nF looking at the CR time-constant on a scope). A direct connection to GPIO16 might therefore cause a glitch on the internal supply as the output struggles to discharge it with no current limiting. This is with a bare ESP6266-12E module. To get comfortably below the reset threshold before the pulse goes high again I'd use no more than 220 Ohms.