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Car Central-Locking System

Car Central-Locking System
For a few pounds you can buy a kit from any automotive accessory shop that will allow your car to be fitted with a central-locking door system. Such a kit essentially comprises a number of motors. There is also a control unit that enables the whole system to function. Here we show an example of such a unit.There are 5-wire motors and 2-wire motors. The 5-wire version is used in doors that have a key-lock.There are 2 connections for the motor itself and 3 connections for the sensor part (an ‘open’ and a ‘close’ contact). These sensors determine whether the door is to be unlocked or locked. If there is no key lock in the door, these sensors are superfluous and a 2-wire motor can be used.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor 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.

Resistors:
R1,R5,R10,R14 = 4kOhm7
R2,R13 = 22kOhm
R3,R12 = 10kOhm
R4,R11 = 47kOhm
R6,R8,R15,R16 = 15kOhm
R7,R9 = 2kOhm7
Capacitors:
C1,C2,C5,C6 = 2µF2 25V radial
C3,C4 = 10µF 25V radial
Semiconductors:
D1-D8 = 1N4148
T1,T2 = BC547B
T3,T4 = BC557B
Miscellaneous:
RE1,RE2 = PCB mount relay, 12 V, 1 x changeover, size 19x15.5x15.5 mm (e.g. Conrad Electronics # 504289)
PCB, order code 040060-1 from The PCBShop
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