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How responsive is it?
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Originally Posted by CtrlAltDefeat
I am very interested in this... If I read the schematics correctly it uses LEDs to show the revs... how responsive will this be? If it's cheaper then an aftermarket tach and can be made to look good I would love a DIY tach... trying to think of where would be best to put the LEDs...
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The BS2 chip scans at 20,000 cycles per second on its clock. The entire code is less than 100 lines. The output display driver section is a rather primitive analog/linear op-amp arrangement but it is very fast. This design is WAY faster in its response than any mechanical tachometer needle can possibly be. The code uses the pulsein command for data and in a worst case situation will generate an accurate RPM number in one revolution of the crankshaft.
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04-02-2009, 07:20 PM
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