Printing equipment such as sheet-fed presses refer to speed in impressions-per-hour. I want to build a circuit that will display this number on 5 LED digits.The sensor will be a simple hall-effect or other sensor that is triggered up to 4 times a second (maybe less than one, probably not more than 5). It's a simple thing to start and stop a timer to calculate the period of the print cycle, but how to convert that to a meaningful IPH figure? Is a look-up table or maths done by microcontroller the only way? Or can some other means be used? I prefer the non-microcontroller solution, as I haven't yet broached the PIC [used as generic term] world... Thanks,-- Al, the usual

The fast response method is to take the reciprocal of the period between events and scale that to the desired units.There are industrial displays made to do just that. I think a common name for them is rate indicators. e.g.:

Counter/tachometer circuit?

Aug 06, 2007 23 Replies

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Usual Suspect 18 years ago

Yes, I frequently download user guides while researching a product.

But my question was more about whether I correctly understand the definition of and need for "scaling" as applied to my case?

Thanks,

Al, the usual

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Spehro Pefhany 18 years ago

First you have to be sure you've got the number you want and not the reciprocal of the number you want, then you can worry about scaling. Only studying the manual or talking to a sales rep will help with that.

Best regards, Spehro Pefhany

"it\'s the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com

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Usual Suspect 18 years ago

OK. Thanks!

Al, the usual

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**THE-RFI-EMI-GUY** 18 years ago

Links to the manuals for this model exist at this url:

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**THE-RFI-EMI-GUY** wrote:

Links to the manuals for this model exist at this url:

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**THE-RFI-EMI-GUY** wrote: I have a Shimpo DT-5TG-0 programmable panel mounted tachometer that will do exactly what you want. Its new/old/stock (never used) $150. Includes instructions.

Joe Leikhim K4SAT "The RFI-EMI-GUY"© "Treason doth never prosper: what\'s the reason? For if it prosper, none dare call it treason." "Follow The Money" ;-P

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