Overclockers Australia Forums
OCAU News - Wiki - QuickLinks - Pix - Sponsors  

Go Back   Overclockers Australia Forums > Specific Hardware Topics > Electronics & Electrics

Notices


Sign up for a free OCAU account and this ad will go away!
Search our forums with Google:
Reply
 
Thread Tools
Old 13th March 2012, 9:44 PM   #1
heavywater Thread Starter
Member
 
heavywater's Avatar
 
Join Date: Oct 2009
Location: South Australia
Posts: 178
Default Tacho for 1 cylinder 2 stroke

Hey,

Just wondering if anyone has an idea of how I could build a tachometer for my bike engine using maybe seven segment displays (preferably 0 - 9,999RPM) ?

Thanks.
__________________
HAF932|i7 920 @ 4.20Ghz|NH-U12P-SE|6GB Trident 1600Mhz|EX58-EXTREME F12|Gainward GTX 275|150GB Raptor|4x 250GB Hitatchi's|Thermaltake Toughpower 850|Death Adder|Dell Keyboard|Benq FP222W|
heavywater is offline   Reply With Quote

Join OCAU to remove this ad!
Old 13th March 2012, 10:02 PM   #2
paulvk
Member
 
Join Date: Mar 2010
Posts: 815
Default

You use the pulse from the spark plug. This is the easy way as you only need a small pulse transformer cliped around the lead to detect it. I think silicon chip had one as a project search their site for it.

Regards Paul
paulvk is offline   Reply With Quote
Old 13th March 2012, 10:12 PM   #3
mike-s
Member
 
mike-s's Avatar
 
Join Date: Dec 2003
Location: Sydney, Australia
Posts: 1,833
Default

Remember if you do this it will be a compromise between fast refresh speeds and ease of readability of the numbers onscreen. Silicon chip mag had an article about making this very thing a few years ago. They may have plans/pcb's for this. Another alternative is maybe altronics if they are still around, they had a lot of kits in their cat'n'dog,uhm, catalog.
__________________
Successfull trades: RakOon, drfbro, mR_CaESaR, Spyfox
If I've got crap for sale on ebay you like, click here.
Old hardware giveaway thread here.
Sony Vaio Club Member #21
mike-s is offline   Reply With Quote
Old 14th March 2012, 1:24 PM   #4
heavywater Thread Starter
Member
 
heavywater's Avatar
 
Join Date: Oct 2009
Location: South Australia
Posts: 178
Default

Thanks lads i'll check those out
__________________
HAF932|i7 920 @ 4.20Ghz|NH-U12P-SE|6GB Trident 1600Mhz|EX58-EXTREME F12|Gainward GTX 275|150GB Raptor|4x 250GB Hitatchi's|Thermaltake Toughpower 850|Death Adder|Dell Keyboard|Benq FP222W|
heavywater is offline   Reply With Quote
Old 14th March 2012, 2:53 PM   #5
dualmassager
Member
 
dualmassager's Avatar
 
Join Date: Aug 2009
Location: Melbourne
Posts: 965
Default

Most tachos off the self are for 4-stroke, so be careful. Most of these tachos just hook up into the ignition source and measure the frequency.
__________________
Main Rig:Intel i7-930| ASUS Rampage III Extreme | G.Skill Sniper + Trident 18GB| 2x 5870 Crossfire| Enermax Modu87+ 700W | Dell U2311H | ATH-AD700 | HP 30B/12C | Late 2013 13" rMBP |


dualmassager is offline   Reply With Quote
Old 14th March 2012, 3:57 PM   #6
aXis
Member
 
aXis's Avatar
 
Join Date: Jun 2001
Location: Kalgoorlie, WA
Posts: 3,549
Default

It might sound overkill, but if you're going to build your own I'd reccomend using an arduino and a character LCD display. The wiring is quite simple, and you'll have more flexability in the display. You could also display more than just RPM, eg battery voltage & temperatures.

The Character LCD's on ebay are dirt cheap and very readable. I'd go for one with few lines but larger font - search for "Character LCD large" - I can see there is a 16x1 with 8mm characters here for only $7.

Programming would also be dead easy - have a regular 1 second timer, count the number of pulses between the start and end of the timer, then update the display.
__________________
Former OCAU Extreme Cooling Club H2O Member
Intel Core Duo E6600 Noctua NH-U12F
aXis is offline   Reply With Quote
Old 14th March 2012, 5:38 PM   #7
mike-s
Member
 
mike-s's Avatar
 
Join Date: Dec 2003
Location: Sydney, Australia
Posts: 1,833
Default

Quote:
Originally Posted by dualmassager View Post
Most tachos off the self are for 4-stroke, so be careful. Most of these tachos just hook up into the ignition source and measure the frequency.
Configure it for use with a twin 4 stroke, problem solved.
__________________
Successfull trades: RakOon, drfbro, mR_CaESaR, Spyfox
If I've got crap for sale on ebay you like, click here.
Old hardware giveaway thread here.
Sony Vaio Club Member #21
mike-s is offline   Reply With Quote
Old 14th March 2012, 6:01 PM   #8
ywn
Member
 
Join Date: May 2003
Location: port macquarie {nsw}
Posts: 859
Default

i use one of theres on my rotax http://www.alfano.com/home.php

it will tell u speed if u set up the gering and wheel size as it works on revs to determen the speed ( so when idling it will have a seepd reding but once moving its will be fine . it has water temp sensers
ywn is offline   Reply With Quote
Reply

Bookmarks

Sign up for a free OCAU account and this ad will go away!

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +10. The time now is 12:00 PM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd. -
OCAU is not responsible for the content of individual messages posted by others.
Other content copyright Overclockers Australia.
OCAU is hosted by Internode!