Subject	The hardest part is over.
Posted by	DVDBURN (MD) on March 11, 2012 at 3:08 AM
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Message	At least I think it is. I pretty much finished interfacing the speedometer and RPM gauge into the iECU project. I knew those were going to be the hardest things to deal with so I went for those first. I figured if I wasn't able to display those then the whole thing wouldn't be very worthwhile. At first I was going to create a software routine to detect and calculate the pulses using the Arduino microcontroller but I decided to go a different route which will free up the controller for the many other things it will need to do. The first thing I thought of was building a little frequency to voltage converter. It would be easy for anyone to connect it to the back of the gauge cluster. I was wanting to build it this weekend but unfortunately the local electronics part distributer (Tritronics) which has the parts I need are closed on the weekends. Then I thought, wait a minute, why should I build this thing when the gauges themself already have that functionality. I searched out the data sheets for the chips on the speedometer and RPM boards and traced out where I needed to tap the voltages from. Both boards chips have a linear voltage output which is generated by the speed and RPM sensor inputs. I tapped a wire to each board and fed it to the microcontroller. After some corrective calculations in software I was able to sync everything together. Doing all this was the hardest part. Everything else is just a linear 0 to 5 volts or an on or off. Anyway, here is a link to a video I made of it on my "never used" YouTube channel for Nissan Data Voice. Someday I'll get around to posting videos of Nissan Data Voice too. In the video I only have signals going to and coming from the speedometer and RPM gauges. The other gauges have no signals so the app isn't displaying their readings correctly. [ http://www.youtube.com/watch?v=cTWE3s6F_s0 ] www.mytwinturbo.com Nissan Data Voice - The first Nissan diagnostic software with a voice! Download my Nissan 300ZX Vin/Model Lookup. Watch an ECZA meet caravan!
Follow Ups	The hardest part is over. - DVDBURN (MD) 03:08:05 03/11/12 Re: The hardest part is over. - Zsgetyoulaid 04:18:53 03/11/12 As usual, Amazing (n/m) - FuerGrissa 05:36:55 03/11/12 Cool stuff and nice work. (n/m) - Boosted1 07:07:12 03/11/12 When will it be in the app store :-) (n/m) - Alan(MD/NJ) 08:52:56 03/11/12 Actually, the app that uses the templates I'm making is - DVDBURN (MD) 14:31:25 03/11/12 I can always swing by - Alan(MD/NJ) 19:57:43 03/11/12 Any time Alan. (n/m) - DVDBURN (MD) 15:55:01 03/12/12 That's awesome Gary! Is gauge design/configuration gonna - PiotrC70 12:33:34 03/11/12 I like the way those look. - DVDBURN (MD) 13:59:26 03/11/12 That sounds promising, since the GUI was the - CoHPhasor 16:20:52 03/11/12 Re: That's awesome Gary! Is gauge design/configuration gonna - sdhsbaseball 16:52:50 03/12/12 Nope, sorry. - DVDBURN (MD) 22:50:39 03/12/12 Oh well.. Worth a shot, cant wait to be able to start - sdhsbaseball 14:01:38 03/13/12 Awesome! Keep up the great work! (n/m) - TheTwinZ (Peru) 22:46:00 03/11/12 Very cool, glad to see someone still innovating (n/m) - boileralum 11:47:00 03/12/12
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