12oclocker Posted April 3, 2009 Author Report Share Posted April 3, 2009 Updated the firmware, now it can work for 2stroke or 4stroke engines, by setting a jumper or flipping a switch, the screen now updates every 500ms, and shows the RPM reading for the last 1sec of sampled data, data is sampled every 500ms, and it uses the last 2 samples for calculations. screen scan is still 5ms. This gives a faster screen response but still maintains smoother readouts Quote Link to comment Share on other sites More sharing options...
12oclocker Posted April 5, 2009 Author Report Share Posted April 5, 2009 I wrote a new firmware version yet again, which instead of sampling how many pulses that occur over a given period of sample rate time, it actually measures the distance in microseconds between 2 pulses, doing thousands of calculations per second. this drastically increases the stability and gives dead on accuracy without ANY floating at all! It also allows the display to update Instantaneously if desired, unfortunately for me the firmware is now incredibly more complicated. which is probably why most people who design RPM meters don't do this, but it is a far superior way to do the calculations if you have a microprocessor that can handle it. I spent about 40hrs or so on this firmware version. Quote Link to comment Share on other sites More sharing options...
12oclocker Posted April 6, 2009 Author Report Share Posted April 6, 2009 Video of the Tachometer prototype design connected to a bike and working...this video is of the redesigned firmware for the chip.http://www.youtube.com/watch?v=vsTTdsS879M Quote Link to comment Share on other sites More sharing options...
12oclocker Posted April 12, 2009 Author Report Share Posted April 12, 2009 I got 4 of them done, I probably wont be making anymore for a while because of how much time it took, here are some pics... Quote Link to comment Share on other sites More sharing options...
bvoklx Posted April 12, 2009 Report Share Posted April 12, 2009 Awesome Job. those are so clean! Quote Link to comment Share on other sites More sharing options...
420gsxr1000 Posted April 13, 2009 Report Share Posted April 13, 2009 wow!!! this should be like in a "smartPPL thread" or something!!! lol Quote Link to comment Share on other sites More sharing options...
12oclocker Posted April 13, 2009 Author Report Share Posted April 13, 2009 Devised a mounting method, here it is...I'll post pics of the final install, but I wanted to work out a good mounting method first.. Quote Link to comment Share on other sites More sharing options...
flounder Posted April 13, 2009 Report Share Posted April 13, 2009 Looks nice and clean. Quote Link to comment Share on other sites More sharing options...
exSRAaron Posted April 13, 2009 Report Share Posted April 13, 2009 Nice and clean 12! Quote Link to comment Share on other sites More sharing options...
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