OBD-2 Analyser
Check out your car’s condition

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Materials
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.
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Extra info / Update
Component list
R1,R2 = 1k
R3,R4 = 100
R5,R9,R15,R16,R21,R25 = 4k7
R6,R7,R8,R10,R11,R14,R17,R22,R23 = 10k
R12,R13 = 510
R18 = 1k1
R19 = 3k9
R20 = 3k
R24 = 1
Capacitors:
C1-C4 = 10µF 16V radial
C5,C6 = 27pF
C7 = 1µF 16V*
C8,C9,C10,C13,C14,C15 = 100nF
C11,C12 = 560pF
Semiconductors:
D1 = LED, high efficiency, green
D2 = LED, high efficiency, yellow
D6 = LED, high efficiency, red
D3 = 1N4001
D4,D5 = 1N4148
T1,T5 = 2N3906
T2,T3,T4 = 2N3904
IC1 = T89C51CC02UA, programmed, Publishers’ order code 050092-41 or from www.ozenelektronik.com; ref. type OE90C2600
IC2 = LM339 in DIL14 case
IC3 = PCA82C251 of PCA82C250, in DIL8 case
IC4 = MAX232, in DIL16 case
IC5 = LM7805C, in TO220 case
IC6 = LM7808C, in TO220 case
IC7 = ZSH560C, in TO92 case *
Miscellaneous:
K1 = 9-way sub-D socket (female), angled pins, PCB mount
K2 = 99-way sub-D plug (male), angled pins, PCB mount
JP1 = 2-way SIL pinheader
X1 = 16MHz quartz crystal, 32pF parallel capacitance
28-way PLCC socket
Case: Hammond type 1591B
RS232 extension cable, non crossed, (1:1) male-to-female
Adapter cable, female DB9 to OBD wired according to Figure 4. Available ready-made, Publishers order code 050092-72
PCB, Publishers order code 050092-1
A complete kit of parts is available from the Publishers; order code 050092-71
Content of kit:
- PCB
- programmed microcontroller
- all other parts
- OBD-to-DB9 adapter cable
- Case
* mount either C7 or IC7
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