Version 4 SHEET 1 1200 680 WIRE -336 -336 -368 -336 WIRE -304 -336 -336 -336 WIRE -112 -320 -144 -320 WIRE -64 -320 -112 -320 WIRE -368 -304 -368 -336 WIRE -368 -208 -368 -224 WIRE -64 -208 -64 -240 WIRE -320 -144 -368 -144 WIRE 688 -128 688 -192 WIRE -368 -112 -368 -144 WIRE -128 -112 -144 -112 WIRE -64 -112 -128 -112 WIRE -368 -16 -368 -32 WIRE -64 0 -64 -32 WIRE 688 0 688 -48 WIRE 320 16 320 -144 WIRE 320 144 320 96 WIRE 448 144 320 144 WIRE 608 144 512 144 WIRE 688 144 688 64 WIRE 688 144 608 144 WIRE 800 144 688 144 WIRE 800 160 800 144 WIRE 608 176 608 144 WIRE 320 240 320 144 WIRE 800 256 800 240 WIRE 1072 256 800 256 WIRE 256 288 16 288 WIRE 608 288 608 240 WIRE 800 288 800 256 WIRE 16 336 16 288 WIRE 800 432 800 352 WIRE 320 528 320 336 WIRE 16 576 16 416 FLAG -64 -208 0 FLAG -368 -208 0 FLAG -336 -336 VV2 FLAG -112 -320 VV1 FLAG 608 288 0 FLAG 16 576 0 FLAG 800 432 0 FLAG 320 528 0 FLAG 320 -144 Vcc FLAG -368 -16 0 FLAG -320 -144 Vcc FLAG -64 0 0 FLAG -128 -112 apin FLAG 688 -192 apin SYMBOL voltage -64 -336 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V1 SYMATTR Value PULSE(0 2 300us 150us) SYMBOL voltage -368 -320 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V2 SYMATTR Value SINE(0 1 40kHz) SYMBOL bv 16 320 R0 SYMATTR InstName B1 SYMATTR Value V=2.5+V(VV1)*V(VV2) SYMBOL schottky 512 128 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 cap 592 176 R0 SYMATTR InstName C1 SYMATTR Value 0.1µF SYMATTR SpiceLine2 IC=2.8 SYMBOL cap 784 288 R0 SYMATTR InstName C2 SYMATTR Value 1000pf SYMBOL res 784 144 R0 SYMATTR InstName R1 SYMATTR Value 47K SYMBOL pnp 256 336 M180 SYMATTR InstName Q1 SYMATTR Value 2N3906 SYMBOL res 304 0 R0 SYMATTR InstName R2 SYMATTR Value 8.2K SYMBOL voltage -368 -128 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V3 SYMATTR Value 5 SYMBOL res 672 -144 R0 SYMATTR InstName R3 SYMATTR Value 10K SYMBOL schottky 672 0 R0 SYMATTR InstName D2 SYMATTR Value BAT54 SYMATTR Description Diode SYMATTR Type diode SYMBOL voltage -64 -128 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V4 SYMATTR Value PULSE(0 5 0 0 0 100us) TEXT 208 -344 Left 2 !.tran 1ms TEXT 904 288 Left 2 ;Output to Arduino TEXT -368 368 Left 2 ;Analogue signal in from HC-SR04 TEXT 696 -168 Left 2 ;Arduino digital output used to reset C1