Water temo gauge thermistor values? - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


MEGAsquirt A place to collectively sort out this megasquirt gizmo

Reply
 
 
 
LinkBack Thread Tools
Old 09-04-2013, 09:37 AM   #21
Senior Member
 
Join Date: Dec 2004
Location: Brisbane, Australia
Posts: 1,272
Total Cats: 32
Default

Ahh yes, I didn't notice one was saying 60 degrees and the other saying 80 degrees.

I'd say our values are "close enough" for sure!
timk is offline   Reply With Quote
Old 09-04-2013, 10:33 AM   #22
Boosting since 1984
Thread Starter
iTrader: (1)
 
stefanst's Avatar
 
Join Date: Sep 2011
Location: Levittown
Posts: 1,198
Total Cats: 68
Default

Tim,

what I've done here can easily be copied. From your earlier posts I can see that you already own an Arduino Mega. My little gizmo is Arduino powered. I just did away with all the external circuitry that isn't necessary for the task at hand and wired it all up on a n experimental PC board.

We have two analog inputs with bias resistors (100 Ohms in this case). They read the values coming off the sensors. Then there are two PWM outputs that power small MOSFETs. Those drive the gauges. One of the gauges was not easily coerced into behaving, so I needed to add some more passive elements on that output, but overall it's a fairly simple thing. Below is the schematic as an image. I can email you the files and Arduino program if you'd like.

ST


Schematic


board


the real thing

Name:  WaterTemplinearized.jpg
Views: 56
Size:  57.1 KB
The linearization curve for the water temp gauge (PW over Analog in)
Attached Thumbnails
Water temo gauge thermistor values?-gaugelinearizer.png   Water temo gauge thermistor values?-gaugelinearizerboard.png  

Last edited by stefanst; 09-04-2013 at 10:48 AM.
stefanst is offline   Reply With Quote
Old 09-05-2013, 03:43 AM   #23
Senior Member
 
Join Date: Dec 2004
Location: Brisbane, Australia
Posts: 1,272
Total Cats: 32
Default

Very nice! Also you have bigger ***** than me soldering an AVR, I usually use a socket.
timk is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
My solution for Oiltemp and Oilpressure input into Megasuirt (MS3) Zaphod MEGAsquirt 41 01-24-2016 01:25 PM
MSPNPPro-MM0105: Coolant Temperature Output slomiata MEGAsquirt 5 10-07-2015 02:11 PM
Back to Stock Part Out!! Turbo Parts, MS2 Enhanced 01-05, Suspension, and MOAR! StratoBlue1109 Miata parts for sale/trade 16 10-02-2015 10:39 AM
Bad head gasket or ? shooterschmidty Engine Performance 8 09-30-2015 11:28 PM


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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 11:06 PM.