swiftakias
New Member
:!: I want to build a tachometer with a lcd or led display to watch my rpm of my car. Can anyone knows or knows a site that can i find something?. I need a schematic please..:roll:
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csaba911 said:Example: the counter counted 100 pulse in one second, your 4 cylinder engine ignition coil make 4 sparks per 1 rotation, 100/4=25, 25*60=1500 RPM, and you done.
:idea:
Correct me if I'm wrong.. :!:
DEVICE 16F84
DECLARE XTAL 4
DECLARE LCD_TYPE 0
DECLARE LCD_DTPIN PORTB.4
DECLARE LCD_ENPIN PORTB.3
DECLARE LCD_RSPIN PORTB.2
DECLARE LCD_INTERFACE 4
DECLARE LCD_LINES 1
PRINT $FE,128
W0 VAR WORD
START:
COUNT porta.0,1000,W0 ' COUNT FOR 1 SEC
W0=(W0*10)/2
CLS
PRINT DEC W0*6," RPM "
GOTO START