Home › Magazines › 2008 › July/August › Digital Rev Counter for (Older) Diesels

Digital Rev Counter for (Older) Diesels

Published in issue 379, July/August 2008

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.

Components

Relevant websites

Free downloads

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

Click below to download a PDF copy of this article from Elektor magazine.

	Downloads
	Article PDF
	10 Elektor Credits
	PCB PDF
	Free download
	Order from Elektor
	Programmed controller AT90S2313
	071133-41 (USD 9.60)
	PCB, bare
	071133-1
	Free downloads
	Software Free download

Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.

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Digital Rev Counter for (Older) Diesels

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Digital Rev Counter for (Older) Diesels

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