Source code for Yaris Tachometer - Toyota Yaris Forums

CtrlAltDefeat · 04-02-2009, 02:52 AM

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...

metalshark · 04-02-2009, 05:14 PM

http://i351.photobucket.com/albums/q...il209DL066.jpg
http://i351.photobucket.com/albums/q...oStichWire.jpg
http://i351.photobucket.com/albums/q...1/HPIM1368.jpg

The first picture is the trial layout.

The second picture is the stitch wire prototype I've used in the car for a year now.

The third picture is how I installed 15 LEDs in the dash. The display is currently set to start flashing all lit lites at 4 Hz when my revs hit my 6000 RPM shift point. The top red comes on at 6'800 RPM as programed and, yes the mill will make it.

metalshark · 04-02-2009, 06:20 PM

Quote:

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...

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.

04-02-2009, 02:52 AM	#1
CtrlAltDefeat I ♥ Yaris View User's Garage Drives: Black 08 LB MT & red 97 Miata Join Date: Oct 2008 Location: Indianapolis IN Posts: 1,313	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... __________________ The trouble with the world is that the stupid are cocksure and the intelligent are full of doubt. - Bertrand Russell

04-02-2009, 05:14 PM	#2
metalshark MetalShark Drives: 2008 Yaris LB Join Date: Oct 2008 Location: Mesa, AZ Posts: 104	Tach Board trial layout http://i351.photobucket.com/albums/q...il209DL066.jpg http://i351.photobucket.com/albums/q...oStichWire.jpg http://i351.photobucket.com/albums/q...1/HPIM1368.jpg The first picture is the trial layout. The second picture is the stitch wire prototype I've used in the car for a year now. The third picture is how I installed 15 LEDs in the dash. The display is currently set to start flashing all lit lites at 4 Hz when my revs hit my 6000 RPM shift point. The top red comes on at 6'800 RPM as programed and, yes the mill will make it. __________________ Absolutely red, Drawtite hitch, CAI, Insulated Header, Amsoil 5w-30, Mag-drain plug, Red-Line MT-90 tranny oil, Scotch-Guard, Window Tint, Dash rug, Custom short throw shifter, Lowered OEM arm rest, Super-Turbo muffler/w chrome slash cut tip., TRD rear sway bar, sticky pads, front shock tower bar, RS grill badge, VVT-i emblems, Second tire set from Tirerack.com, DISABLED DAY TIME RUNNING LIGHTS, platform- style locking custom bike rack. 86K miles so far. 5 years use now on ceramic wrapped insulated stainless-steel header.

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