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REQ: Tach circuit for motorcycle (bargraph)

M

me

Jan 1, 1970
0
looking for ideas (diagrams) for a bargraph tach for a motorcycle
Vtwin cylinder like a lm3914 with led's and a interface led per 500
rpm 0-5000 Thanks
 
M

Marlowe

Jan 1, 1970
0
I would use a PIC 16F628 chip as the central processor interfaced to your
cycle via a rare earth magnet & Hall sensor attached to the motor
crankshaft. The PIC reads the magnet crossing the Hall sensor and counts
time. At the next crossing the PIC computes the correct LED to light up the
correct via program logic or a simple table. The 628 has enough I/O pins to
read the Hall and light a ten segment LED bar display
http://www.allelectronics.com/cgi-bin/category.cgi?category=345&item=BG-10&type=store

I use the Hall from http://www.allelectronics.com/cgi-bin/category.cgi and
Radio Shack sells small rare earth magnets that can easily and reliably
attached to a rotating hob or gear.

I am using a 16F628 and the Hall/magnet to measure RPM for a PIC controlled
electronic ignition system for a 31cc gas engine for a R/C airplane. It
does the job quite nicely. You do need a PIC programmer and the necessary
software to program the chip.
 
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