Ton Giesberts
About the article


Perfect parking with a reversing aid

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.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.

Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Component list

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)
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.
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
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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