Circuit schematic for LED tachometer?

[wsemajb]

My circuit/electronics skills are pretty limited to following schematics and building a circuit directly from them.

I'm trying to find a circuit to get me 99 percent of the way toward interfacing the following two items for indicating ml/min water flow...

https://img.diytrade.com/cdimg/163371/3406791/0/1174985167/MS_Mini_flow_sensor.jpg
15 LED Circular & Linear Bargraphs - LEDtronics - 12991

I'd like the bargraph to register 0 - 2000 ml/min. With straight up (middle) bar indicating 1000ml/min

I realize that this is essentially an LED bargraph tachometer reading pulses from a hall effect switch.
Since RPM measurement with hall switches is such a common task, I'm hoping that there exists
some schematic involving the following ICs to accomplish this with little additional conditioning
or (hopefully no) programing.

LM2917 freq/volt converter IC
LM3914/15/16/17 LED driver ICs

Would the following page be of use to me?




Thanks so much.

Brad

 

[wsemajb]

Am I wrong in approaching this as a tachometer?

 

[ericgibbs]

Am I wrong in approaching this as a tachometer?

hi,
Look thru these, one is for 2917/3914
https://www.electro-tech-online.com/search.php?searchid=481998

 

[Reloadron]

Hi Eric

Maybe it is me but the Link no workie, workie?

Ron

 

[ericgibbs]

Hi Eric

Maybe it is me but the Link no workie, workie?

Ron

hi Ron,
Just retried it OK,??

This is the actual thread for the 2917/3914

I Searched the Forum for 2917 tachometer

Many Thanks
Eric
https://www.electro-tech-online.com...r-schematic.106247/?highlight=2917+tachometer