Version 4
SHEET 1 880 680
WIRE 192 -32 64 -32
WIRE 336 -32 192 -32
WIRE 448 -32 336 -32
WIRE 64 0 64 -32
WIRE 192 48 192 -32
WIRE 336 128 336 -32
WIRE -16 144 -208 144
WIRE 64 144 64 64
WIRE 64 144 48 144
WIRE 96 144 64 144
WIRE 192 144 192 112
WIRE 192 144 160 144
WIRE 288 144 192 144
WIRE 336 240 336 224
WIRE 576 240 336 240
WIRE 336 272 336 240
WIRE 336 400 336 352
FLAG 336 400 0
FLAG 448 48 0
FLAG -208 224 0
SYMBOL cap 48 128 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 0.1µF
SYMBOL cap 176 48 R0
SYMATTR InstName C2
SYMATTR Value 0.1µF
SYMBOL schottky 160 128 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName D1
SYMATTR Value BAT54
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL schottky 48 64 M180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D2
SYMATTR Value BAT54
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL pmos 288 224 M180
SYMATTR InstName M1
SYMATTR Value BSS84
SYMBOL res 320 256 R0
SYMATTR InstName R1
SYMATTR Value 10K
SYMBOL voltage 448 -48 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 3V
SYMBOL voltage -208 128 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value PULSE(3V 0 0.2s 0 0 0.0002 0.0005 10)
TEXT -216 112 Left 2 ;Serial data
TEXT 448 200 Left 2 ;ESP 8266 CH_PD pin
TEXT -218 424 Left 2 !.tran 1