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,

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 21 Replies

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Usual Suspect 18 years ago

OK. Thanks!

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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: 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.

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