LED Tach Sources?

[Netjammer]

Hello, Can someone point me to a LED source that makes 20+ bar segments such as the ones shown here...

http://primeled.com/

Ideally they would be arranged in a round configuration as I'm planning on making a tach (I know, first time user project) :)

Cheers!
Netjammer-

[Dwayne]

Hello Net Jammer,

this may help...

http://www.allelectronics.com/cgi-bin/category.cgi?category=345&type=store

Dwayne

[mister_e]

well,
as i understand you want to use these bar to display an Variable value. Which kind of display you need. Full bar or only 1 led at the time ???

I assume you'll use full bar display. In this case you can use serial shift register in cascade to give you all outputs pins you need and use an trivial serial output to them. this should work as you wish. or, more simple use PIC16F871 with up to 33 i/o lines.

regards

[Acetronics2]

Hi,

Elektor magazine did what you intend to do several years ago ...
but, there's no PIC in; just an U 1096B ( 30 led's driven ...not too bad !!!) and a 555

it was in july/August 1986 issue ...project N°32; and overall, you get a wonderful PCB drawing ...

I did one ...no problems !!!

Alain

[mister_e]

Huummm. It seems U1096B is obsolete now. Why not using a few "old timer" LM3914,LM3915, LM3916 instead of. Input of tach can be connect to a simple LM2917 frequency to voltage converter. Since the tach signal is not really clear and *un-noisy* is better to use this one.

In the past i did something similar to read tach signal with PIC. The target project was an TachProbe for remote starter installer (like i was). It was reading Tach source and convert it into Cylinder reading. It's still on use and on *market* now. For this i just read the input frequency by using two Pulsin command to get the period of the input signal. With a simple formula i convert period in a cylinder reading.

maybe this can be use for your project too.

regards

[Netjammer]

Originally posted by Dwayne
Hello Net Jammer,

this may help...

http://www.allelectronics.com/cgi-bin/category.cgi?category=345&type=store

Dwayne

Dwayne, thanks for the lead. That place looks promising.
Cheers!
Netjammer-

[Netjammer]

Originally posted by mister_e
Huummm. It seems U1096B is obsolete now. Why not using a few "old timer" LM3914,LM3915, LM3916 instead of. Input of tach can be connect to a simple LM2917 frequency to voltage converter. Since the tach signal is not really clear and *un-noisy* is better to use this one.

In the past i did something similar to read tach signal with PIC. The target project was an TachProbe for remote starter installer (like i was). It was reading Tach source and convert it into Cylinder reading. It's still on use and on *market* now. For this i just read the input frequency by using two Pulsin command to get the period of the input signal. With a simple formula i convert period in a cylinder reading.

maybe this can be use for your project too.

regards

First off, I'd like to thank everyone for giving me some input to this starter project.

Mister_e, I went and purchased several LM2917 Freq to Voltage converters. I also picked up the 3914's LED drivers. I saw the tech application note 162 that showed how to make an automotive tach. That was nice but I want to go the route of using a 16877 PIC, since that is what came with my ME Lab kit (X1). Do you have any code that demonstrates what you did above?

Thanks for in advance everyone!
Cheers!
Netjammer-