Outmanoeuvred
Perfect parking with a reversing aid
Published in issue 399, March 2010
It’s not always easy to reverse a car. There are some good reasons why modern cars are often fitted with sensors that indicate when the rear bumper comes dangerously close to an object behind the car. The circuit described here is the perfect solution to make parking easier in fixed locations, such as in a garage.
Resistors
R1,R2,R3,R14,R15 = 100kOhm
R4,R7 = 22kOhm
R5 = 68kOhm
R6 = 220kOhm
R8 = 470kOhm
R9,R10 = 39kOhm
R11 = 2.7kOhm
R12 = 1kOhm
R13 = 1MOhm
R16,R17 = 4.7kOhm
R18 = 1.5kOhm
R19 - R22 = 330Ohm
P1,P2 = 100kOhm preset (Piher)
Capacitors
C1 = 100µF 25V, radial, lead pitch 2.5mm (0.1'') , diam. 8mm max.
C2 = 100nF MKT, lead pitch 5mm (0.2'') or 7.5mm (0.3”)
C3 = 4.7µF 63V, radial, lead pitch 2.5mm (0.1''), diam. 6.3mm max.
C4 = 470µF 25V, radial, lead pitch 5mm (0.2''), diam. 10mm max.
C5 = 100nF ceramic, lead pitch 5mm (0.2'')
C6 = 10µF 63V, radial, lead pitch 2.5mm (0.1''), diam. 6.3mm max.
C7 = 220µF 25V, radial, lead pitch 2.5mm (0.1''), diam. 8 mm max.
Semiconductors
D1–D4 = BAT85
D5–D24 = LED, 5mm, red, low current
D25 = LED, green, 5mm, low current
D26 = zener diode 3.6V, 1.3W
T1 = BC550C
T2 = BD139
IC1 = MCP6004-I/P (Farnell # 1605571)
IC2 = 78L05
Miscellaneous
K1,MOD1 = 3-pin SIL pinheader
K2 = 3-pin right angled SIL pinheader
MOD1 (not on PCB) = GP2D120 (Farnell # 9707859)
2 pcs PCB solder pin, diam. 1.3mm
3 pcs BPH-002T-P0.5S, JST BPH-002T-P0.5S (Farnell # 3617210)
PHR-3, JST PHR-3 (Farnell # 3616198)
Socket for 3-pin SIL header
PCB # 090184-1
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Click below to download a PDF copy of this article from Elektor magazine. Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.
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