sg_frost
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| posted on 25/6/03 at 10:39 PM |
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digital rev counter
anyone know how to build a digital rev counter, the type using 7 bit led number indicators, or where i can find a wiring diagram on this internet
thingy!!
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MikeRJ
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| posted on 26/6/03 at 08:13 AM |
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Maplin used to sell a kit might be worth chekcing their web site http://www.maplin.co.uk
However, digital tachometers are awfull, horrible things. You'd be far, far better off with a good quality analog style unit.
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ceebmoj
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| posted on 26/6/03 at 10:18 AM |
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hi I am producing theas that use a number of LEDs to signal the RPM if you are intrested then give me an email
However I do have a bit of a back log of devices to build because of problem with parts delivery at the moment
next weak some time I should have a section on the locost coop web sight.
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blueshift
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| posted on 2/7/03 at 03:13 PM |
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ooh, there's going to be a locost coop website? where?
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ned
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| posted on 2/7/03 at 03:55 PM |
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i know this was talked about a couple-a weeks ago.
any update on this?
where?
Ned.
beware, I've got yellow skin
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RichyMkIndy
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| posted on 7/7/03 at 01:21 PM |
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what so you can supply me with a set of green-orange-red LEDS which will light up as the revs increase like on the F1 Cars?
if you can i would be very interested
Thanks
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ceebmoj
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| posted on 7/7/03 at 03:32 PM |
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Yes that is exactly what I can build you however I have a back log of stuff to do for other people first so there would be a bit of a weight involved
and I would need to know what engine you have.
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Bob C
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| posted on 17/7/03 at 11:52 AM |
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digital rev counter
I'm making one too - going for row of LEDs, every 400rpm at low revs & every 200rpm over 7000 (yeah bike engine). The easy way to do this is
count ignition pulses in a fixed time period, however this gives a lousy jerky response, so I'm measuring the time from one ignition pulse to
the next and doing a 1/t thing. The other thing I'll be doing is to make the bar graph the shape of the engine's power curve. Should be
fairly cool (I hope). Just using big 7 segment LEDs for mph & the 10 LED bargraphs for fuel oil and temp. ETA about 4 yrs.... (though I have some
rtl VHDL already & a xilinx spartan dev kit to try it on)
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Spyderman
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| posted on 17/7/03 at 03:36 PM |
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quote:
Originally posted by Bob C
I'm making one too - going for row of LEDs, every 400rpm at low revs & every 200rpm over 7000 (yeah bike engine). The easy way to do this is
count ignition pulses in a fixed time period, however this gives a lousy jerky response, so I'm measuring the time from one ignition pulse to
the next and doing a 1/t thing. The other thing I'll be doing is to make the bar graph the shape of the engine's power curve. Should be
fairly cool (I hope). Just using big 7 segment LEDs for mph & the 10 LED bargraphs for fuel oil and temp. ETA about 4 yrs.... (though I have some
rtl VHDL already & a xilinx spartan dev kit to try it on)
Sound interesting even though you are speaking a foreign language!
Terry
Spyderman
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Bob C
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| posted on 18/7/03 at 12:14 PM |
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digital rev counter
If a few folk were interested I'd do a proper kit, PCB and parts list; trouble is I won't need it for years so god knows when it'll
be ready. It does what I want in a dash, not necesssarily to everyone's taste! I'll post more details when I've more hardware... Non
linear analog tacho the shapoe of the power curve (that'll be the shape of a R1 power curve.....) everything dims in the dark (Headlights on) be
about 3x6inches big. Outputs to drive LCD totalisers for odometer/trip.
cheers
Bob C
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gra
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| posted on 31/8/03 at 10:32 AM |
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quote:
Originally posted by ceebmoj
Yes that is exactly what I can build you however I have a back log of stuff to do for other people first so there would be a bit of a weight involved
and I would need to know what engine you have.
hi mate
do you know roughly what sort of price? for these, for a cossie engine
cheers
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stephen_gusterson
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| posted on 31/8/03 at 10:19 PM |
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many moons ago, I made a digital reve counter. It wasnt very readable. The problem with a rev counter is that the revs change very rapidly, giving a
rapid changing numeric display thats very hard to make sense of!
A trend bar, or limit leds would be much easier for a human to make sense of.
atb
steve
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ceebmoj
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| posted on 1/9/03 at 08:22 AM |
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Hi they are going to be some thing like 80 quid when I have finished them has it has taken me much longer than expected to develop them. To build a
system that switch on an LED at various RPM is relatively easy. However the rev limiter has become something of a problem I just cant put down. I come
up wit a nice solution and the I go to bed and wake up the next day with a better one. Witch is probably starting to annoy thowes who I have said that
I am building one for already however the rpm limiting is now nice and progressive and does not lead to the banding that you get in lots of comershal
systems.
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