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Digital Rev Counter for (Older) Diesels

Digital Rev Counter for (Older) Diesels
Current diesel vehicles are (practically) all fitted with a rev counter. But diesel-engined cars tend to ‘last’ longer than their counterparts with petrol engines, so it is more than likely that there are still a fair number of older diesel cars around without such an instrument for measuring engine speed. We’re going to enable you to fit them with one.
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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,R4-R8 = 4kOhm7
R3 = S14K14 varistor
R9-R16 = 220Ohm
C1 = 100µF 25V
C2 = 10µF 25V
C3 = 100nF
C4 = 10nF
C5,C6 = 22pF
D1-D8 = LED, red, rectangular
LD1-LD4 = 7-segment LED display, common anode, e.g. HD1105
T1-T5 = BC557
IC1 = AT90S2313, programmed with hex file from archive 080238-11
IC2 = 7805T
X1 = 3.6864 MHz quartz crystal
K1,K2 = solder pin
K3 = 3-way pinheader
K4 = 2-way pinheader with jumper
UGN31 Hall-effect sensor
PCB, ref. 071133-1 from www.thepcbshop.com
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