Article
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.
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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PCB
Component list
Resistors
R1,R2,R4-R8 = 4kOhm7
R3 = S14K14 varistor
R9-R16 = 220Ohm
Capacitors
C1 = 100µF 25V
C2 = 10µF 25V
C3 = 100nF
C4 = 10nF
C5,C6 = 22pF
Semiconductors
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
Miscellaneous
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
R1,R2,R4-R8 = 4kOhm7
R3 = S14K14 varistor
R9-R16 = 220Ohm
Capacitors
C1 = 100µF 25V
C2 = 10µF 25V
C3 = 100nF
C4 = 10nF
C5,C6 = 22pF
Semiconductors
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
Miscellaneous
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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