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Digital Tachometer for record player (LCD display)
Digital Tachometer for record player (LCD display)
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Old 7th November 2017, 06:00 PM   #211
zmck is offline zmck  Brazil
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Join Date: Apr 2015
My Falcon PSU finally arrived from USA, the tachometer signal didnīt work at first attempt.
I wired the plug as instructed by Bill, shield (gnd) and ring (Rxd), no tip connection.
Maybe my TTL>RS232 labels are incorrect, because I connected the TX signal from the Arduino to the RX of the interface TTL side and then the TX of the interface RS232 side to the plug ring (Rx).
If I connect the plug ring to a DB9 #2 pin and plug shield to a DB9 #5 pin of an old computer, that should read the data from a terminal program linked to the corresponding COM port, right ???

Anyway, the RPM readings from the tachometer, just with the Falcon PSU alone, are now A LOT more stable, and can be precisely adjusted! What a great product!!!
I donīt understand the reason why the Roadrunner is completely sold out and itīs still possible to find a Falcon or Eagle PSU ?
Because, if someone choose to buy just one, a PSU unit is the obvious choice.

Last edited by zmck; 7th November 2017 at 06:08 PM.
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Old 7th November 2017, 06:08 PM   #212
Packgrog is offline Packgrog  United States
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I used one of these with my RS232 shield and a radio shack mini cable, which wound up a little bulky, but *MUCH* easier: Amazon.com: DB9 Male Signals Breakout Board RX TX GND 3-Pin: Home Audio & Theater
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Old 7th November 2017, 06:16 PM   #213
Packgrog is offline Packgrog  United States
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Quote:
Originally Posted by zmck View Post
Anyway, the RPM readings from the tachometer, just with the Falcon PSU alone, are now A LOT more stable, and can be precisely adjusted! What a great product!!!
I donīt understand the reason why the Roadrunner is completely sold out and itīs still possible to find a Falcon or Eagle PSU ?
Because, if someone choose to buy just one, a PSU unit is the obvious choice.
Because many motors aren't synchronous AC motors, and thus wouldn't see much benefit (other than cleaner power). DC motor-driven decks could still use a Roadrunner, or even one of these DIY tachs, independently from the PSU.
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Old 7th November 2017, 06:25 PM   #214
zmck is offline zmck  Brazil
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Thanks Packgrog!
I guess youīre right for both your comments!
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Old 9th November 2017, 12:40 PM   #215
kffern is offline kffern  Australia
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Digital Tachometer for record player (LCD display)
How does Zmck's tacho reads to 4 digits? Its probably buried in the thread somewhere? 3 is plenty for my TTs though.
I am using a proximity sensor and it works well. Its surprising how long my Lenco takes to settle down to a steady speed. Using my Lenco Heaven PS its difficult to set an accurate speed. Now to start on Pyramids PS.
Regards,
kffern

Last edited by kffern; 9th November 2017 at 12:49 PM.
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Old 9th November 2017, 12:59 PM   #216
Pyramid is offline Pyramid  United States
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Originally Posted by kffern View Post
How does Zmck's tacho reads to 4 digits? Its probably buried in the thread somewhere? 3 is plenty for my TTs though.
I am using a proximity sensor and it works well. Its surprising how long my Lenco takes to settle down to a steady speed. Using my Lenco Heaven PS its difficult to set an accurate speed. Now to start on Pyramids PS.
Regards,
kffern
It has to do with the last parameter in the line that sends the reading to the LCD: LCD.print(RPM,3);

In my code, I set the decimal parameter to 3 because of the sampling frequency I used (31.25kHz). A count of 56250 would yield 33.3333333 RPM and a count of 56251 (+1) would yield 33.33274, so the effective resolution is only 3 decimal places.

On some of the earlier code scripts, the sampling frequency was 250kHz which would allow higher resolution than 3 decimal digits, but in practice, trigger ambiguity and other tolerances effectively makes anything more than 3 decimal places moot.

That being said, you can display as many decimal places as the Arduino function can return.
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Old 9th November 2017, 01:58 PM   #217
zmck is offline zmck  Brazil
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Sorry, I forgot to explain about the four decimal digits "precision"...
When testing the OLED display I wanted to know the maximum number of large digits possible to show and ended up with 4. So, it has nothing to do with an enhanced resolution.
I will reduce to 3 digits when I assemble it in a definitive aluminum case to pair with the Falcon.
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Old 9th November 2017, 02:09 PM   #218
Packgrog is offline Packgrog  United States
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Quote:
Originally Posted by zmck View Post
I will reduce to 3 digits when I assemble it in a definitive aluminum case to pair with the Falcon.
I would also recommend adding some damping material between the case and plinth *IF* you plan to leave your tach on the plinth during playback, is it would introduce some weird resonance back into your plinth. If it's just for setup, and removed during playback, no worries. :P
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Old 9th November 2017, 06:07 PM   #219
zmck is offline zmck  Brazil
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Sure, that portable 9v battery operated version I made for tests and to be used just as a tool for quick setup of friends turntables.
The definitive version will have a case similar to the Falcon PSU and will be placed under the TT.
Iīve just ordered the aluminum case from this website:

MWF eStore

It will be precisely CNC machined to fit the OLED display at the front panel and the connectors on the rear.
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Old 19th November 2017, 12:11 PM   #220
kffern is offline kffern  Australia
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Digital Tachometer for record player (LCD display)
I thought I would post pictures of my implementation. Thanks again Pyramid, Tauro and all those who assisted getting this done for us.
I have 2 inputs at the back which are switched from the upper toggle switch on the front panel. The battery at the back is for when I move it to the other system. I use a wired snap on 9v connector wired to a female DC plug to go to a 9V plugback for normal use. I use a proximity sensor with a 3.5mm stereo plug.
The arduino clone, display and sensor cost me AUD30 The box and plugs another $20 or so.
Sorry about the display but it got lost in the glare. The display cutout was a bit of a hatchet job.
I can post links to the parts I bought to help Aussie builders if any one is interested.
Regards,
kffern
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File Type: jpg PB110150.jpg (38.7 KB, 233 views)

Last edited by kffern; 19th November 2017 at 12:15 PM. Reason: content
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