Version 4
SHEET 1 1640 680
WIRE 288 -144 240 -144
WIRE 240 -128 240 -144
WIRE 240 0 240 -48
WIRE 512 0 240 0
WIRE 240 16 240 0
WIRE -80 64 -128 32
WIRE 0 64 -80 64
WIRE 128 64 80 64
WIRE 176 64 128 64
WIRE -80 96 -80 64
WIRE -128 112 -192 112
WIRE 128 128 128 64
WIRE 240 144 240 112
WIRE -720 176 -720 128
WIRE -560 176 -544 112
WIRE -80 192 -80 176
WIRE -720 304 -720 256
WIRE -560 304 -560 256
WIRE -80 320 -80 272
WIRE 128 320 128 208
WIRE 240 320 240 224
FLAG -720 304 0
FLAG -720 128 V+
FLAG 240 -144 V+
FLAG -128 32 Eingang
IOPIN -128 32 In
FLAG 512 0 Ausgang
IOPIN 512 0 Out
FLAG 240 320 0
FLAG -80 320 0
FLAG 128 320 0
FLAG -128 160 0
FLAG -192 112 Ree_Sch
IOPIN -192 112 In
FLAG -560 304 0
FLAG -544 112 Ree_Sch
IOPIN -544 112 Out
SYMBOL voltage -80 176 M0
WINDOW 123 24 124 Left 2
WINDOW 39 0 0 Left 2
SYMATTR Value2 AC 1 0
SYMATTR InstName Vin1
SYMATTR Value 5
SYMBOL npn 176 16 R0
SYMATTR InstName Q1
SYMATTR Value 2N3904
SYMBOL voltage -720 160 M0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
WINDOW 3 -26 58 Left 2
SYMATTR InstName Vb1
SYMATTR Value 3.3V
SYMBOL res 96 48 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL res 112 112 R0
SYMATTR InstName R3
SYMATTR Value 100k
SYMBOL res 224 -144 R0
SYMATTR InstName R4_Pull_up
SYMATTR Value 20k
SYMBOL e -80 80 R0
SYMATTR InstName E1_ree
SYMATTR Value 1
SYMBOL voltage -560 160 M0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
WINDOW 3 -216 105 Left 2
SYMATTR InstName V_ree
SYMATTR Value PULSE(0 1 0 0.1m 0.1m 0.2 0.5 10)
SYMBOL res 224 128 R0
SYMATTR InstName R4
SYMATTR Value 20k
TEXT -280 400 Left 2 !.tran 1
TEXT -288 368 Left 2 !;ac oct 100 1 500k
TEXT 192 -184 Left 2 ;3.3V GPIO Pin1
TEXT 424 -40 Left 2 ;RPi GPIO 18 or 23  Logic LOW
TEXT 144 360 Left 2 ;RPi Ground
TEXT -192 232 Left 2 ;9-12V
TEXT -248 -352 Left 2 ;https://www.mikrocontroller.net/topic/470146#new