Digital Tachometer for record player (LCD display)

[Pyramid]

Hi I have question, Arduino Uno R3 - Power pin (5V) from this single point I can take power for LCD & Hall Effect sensor? Hall sensor from hifi heaven need 5V or 3.3V? Thanks Raj

Yes, the sensor runs from 5VDC.

 

[coolmaster]

Sorry to inform late that I've been hospitalized for a intestinal growth already removed. I'm not able to help further. Sorry again.

 

[Pyramid]

coolmaster-

I'm sorry to hear about your medical condition. Feel better and get well soon.

 

[Rajkumar_]

To Coolmaster, Thanks lot, you given idea build cool Midas tachometer, Mr. Bill helped me to complete my Midas tachometer. Please take care your heath.

To Bill, thanks lot. Rajkumar

 

[Rajkumar_]

Hi find my tachometer completed, I have ordered ZeroZone linear power supply for my turntable motor, I build my tachometer (Midas LCD+ Arduino Uno) inside linear power supply. Thank you all helping build accurate turntable tachometer. Rajkumar

 

[Pyramid]

Great looking build; glad it worked out. The table looks great and appears to be very accurate.

 

[Rajkumar_]

Thanks Bill, this table originally direct drive, I have modified 2 in 1 direct belt drive. There was sound different in belt and direct. When I build belt drive never use direct. I love to listen belt drive. Rajkumar

 

[flamethrower1]

Thanks Bill, this table originally direct drive, I have modified 2 in 1 direct belt drive. There was sound different in belt and direct. When I build belt drive never use direct. I love to listen belt drive. Rajkumar

That is a nice looking isolated motor housing, good job

 

[flamethrower1]

Not trying to hijack the thread.
I just checked HiFi Heaven website to purchase another of the sensor module.
Glad to see they are still around.
I will however say, it is sad to see the Roadrunner and the Falcon still listed but, unavailable.
Glad I have them in my system.

 

[raymondo]

I have been following this thread with great interest . Really great to see this come together and brilliant of Pyramid to share his code & expertise . I've built an RG4 so now on to this

I've got the Arduino , OSHPark Sensor PCB's (which I am just building) . and am about to buy these displays

MUZOCT IIC/I2C/TWI 1602 Serial Blue Backlight LCD Module for Arduino UNO R3 MEGA2560: Amazon.co.uk: Computers & Accessories

Do they look about right ? I just need to add that display type to the code ?

Thanks all

 

[Pyramid]

@raymondo- It's I2C so it should work, you just have to make sure you have the right address (use the Scanner script in post #307 to find the address if in doubt) and it doesn't need a negative supply like the Midas module; if it does, you will need to mod the display.

 

[raymondo]

thanks bill - i'll order and give it a go . modification is no problem if needed - is there an easy way to spot if it needs a -ve supply?

 

[Pyramid]

An indication would be lack of range in contrast control. I was surprised to learn the Midas display needed this; usually it is only needed for extended temp operation.

 

[raymondo]

ok great thanks bill - everything is ordered so I will give it a go in the next few days. do i need to do something to the line

LiquidCrystal_PCF8574 lcd(0x3f);

in the code once I have my display apart from change the address to whatever mine uses?

 

[tauro0221]

Hi,
I think for that type of display with the I2C adapter installed you need to do like this.
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2)
The second line you must set the address that it maybe Ox27 or 0x3F. and how many characters and how many lines.

 

[raymondo]

Hi,
I think for that type of display with the I2C adapter installed you need to do like this.
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2)
The second line you must set the address that it maybe Ox27 or 0x3F. and how many characters and how many lines.

thanks a lot - as soon as the kit lands i will build it and report back .

 

[raymondo]

Ok so I've got the display working and tested with a hello world sketch
But when I try and complile the tach ino i get this error

Using library LiquidCrystal_I2C-1.1.2 at version 1.1.2 in folder: C:\Users\braymond\Documents\Arduino\libraries\LiquidCrystal_I2C-1.1.2
exit status 1
expected ',' or ';' before 'const'

The line highlighted is the first one

const int TRIGGER=3; //* input on PB3

I'd post a screenshot but cant work out how to do that !

Any ideas ?

Thanks

 

[Pyramid]

Did you copy tach.ino from a file or from a screen shot here on DIYAudio. The screen shots will randomly omit characters.

The error may be at the end of the previous line; is there a semi-colon after the lcd declaration:

LiquidCrystal_PCF8574 lcd(0x3f);

 

[raymondo]

Did you copy tach.ino from a file or from a screen shot here on DIYAudio. The screen shots will randomly omit characters.

The error may be at the end of the previous line; is there a semi-colon after the lcd declaration:

LiquidCrystal_PCF8574 lcd(0x3f);

you were right it now looks like this

LiquidCrystal_I2C lcd(0x27, 16, 2);

and compiles and uploads fine - but - nothing happens . I've not got the sensor built yet but figured it would still display something .

so for example if im running the hello world scrolling program and then upload the tach one it uploads but the display freezes and then nothing happens . It is definitely uploading fine.....

 

[Pyramid]

It should display the title on the top line of the LCD and "RPM: --.---" on the bottom line.

Does the tach sketch use the same LCD initialization and configuration commands as your Hello World sketch?