Version 4
SHEET 1 880 680
WIRE 256 -160 224 -160
WIRE 224 -96 224 -160
WIRE 224 0 224 -16
WIRE 96 48 64 48
WIRE 128 48 96 48
WIRE 96 80 96 48
WIRE 96 80 -112 80
WIRE 128 80 128 48
WIRE -112 112 -112 80
WIRE 224 144 224 80
WIRE 128 192 128 160
WIRE 160 192 128 192
WIRE -112 208 -112 192
WIRE 224 272 224 240
FLAG 64 48 GPIO23
IOPIN 64 48 In
FLAG 256 -160 +9V
IOPIN 256 -160 BiDir
FLAG 224 272 0
FLAG -112 208 0
SYMBOL npn 160 144 R0
WINDOW 3 56 60 Left 2
SYMATTR InstName Q1
SYMATTR Value 2N3904
SYMBOL ind 208 -112 R0
WINDOW 3 36 68 Left 2
SYMATTR InstName Lcoil
SYMATTR Value 1
SYMBOL res 208 -16 R0
SYMATTR InstName Rcoil
SYMATTR Value 580
SYMBOL res 144 176 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 48 Left 2
SYMATTR InstName Rb
SYMATTR Value 1k5
SYMBOL voltage -112 96 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 3.3
TEXT 320 40 VLeft 2 ;relay coil
TEXT 64 32 Left 2 ;+3.3V
TEXT -78 296 Left 2 !;op
TEXT 8 304 Left 2 !.dc temp -55 125
RECTANGLE Normal 336 96 208 -112