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April 20th, 2005 12:05 AM #11and here is the MAP sensor output characteristics
note that high vacuum is on the left side of the plot where the output is nearly 3 volts ... so the bargraph should display full scale (all LED's lit) at this condition ... since the LM3914 is set for 1.25 volt full-scale at its input pin 5, you could expect the trimpot to be positioned just around the middle for proper calibration
in my car, during idle, 6-7 LED's are lit ... all LED's lit up during deceleration ... no LED lits up when gas pedal is pressed hard ... i've used rectangular LEDs with red for 1&2, yellow for 3 to 6, and green for 7 to 10
good luck!
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April 20th, 2005 09:08 AM #13
OT: those diagram reminded me of my pre-engineering days in college. wheew.
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April 20th, 2005 09:22 AM #14eto datasheet ng LM3914 sa mga may kelangan:
http://www.national.com/ds.cgi/LM/LM3914.pdf
para naman sa LM3915
http://www.national.com/ds.cgi/LM/LM3915.pdf
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April 20th, 2005 09:29 AM #15Originally Posted by Poops
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April 20th, 2005 10:51 PM #16Originally Posted by Poops
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April 21st, 2005 11:51 AM #17Cool..no limiting resistors. Mindset ko kasi before was with thos LS245 drivers.
Thanks. BTW, what 5V regulator are you planning on using (i.e. with a 12VDC input voltage)?
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April 21st, 2005 02:35 PM #18Originally Posted by Poops
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April 21st, 2005 11:08 PM #19sir kinyo, nice project... patanong na rin... san ba MAP sensor ng civic? wala akong alam dun e... pwede rin bang makita yung led display mo? (yung finish product) tia!
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April 22nd, 2005 01:10 AM #20jepoy ... hirap akong sagutin ang tanong mo kasi nahihilo ako sa avatar mo!
kunan ko muna ng pics yung mga gusto mo makita ... kapag nawala ang hilo ko bukas ... btw my project is not a finished product, when i saw that my prototype worked, had some fun watching the the display while driving, i didn't have the time to finally install it permanently so i shelved it ... i was happy enough that it worked
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