DIY Arduino based Digital Tachometer │ Revolution counter

Hello guys I have made a Digital Tachometer using Custom made PCB

Material required

6) 9V Battery

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Music
Creative Commons — Attribution 3.0 Unported— CC BY 3.0

My Gears :-

[kreynolds]

I believe the circuit be simplified feeding the output of the (light sensing diode and resistor voltage divider) directly to an analog input, and the output of the potentiometer directly to another analog input, and then compare the signal levels in software, and Get rid of the comparator and indicator diode opting instead to use the display as an indicator.
I also think you'll ensure greater sensitivity if you put a partition between the infrared LED and the light sensing diode.

[yeyee]

you know its not a good idea to use delay(1000) for a time based measurement. the delay function value will drift off over time. My advice is to use timer1 to create precise 1s overflow interrupt & use ext interrupt to save the count on how many times the white stripe get detected by the sensor. that way it wont miss any count caused by the stuck at waiting for delay function, further increasing its accuracy. just some advice from a noob tho✌️

[alkatechnology]

great job bro... thanks..
hello from Indonesia..

[fudgymcfudgerson]

3:05
When you think he is about to show you the mistake he made creating the board...

Nope - just the song...

lol

[JonathanBydendyk]

Would be nice if there was an explaination

[moycjoe]

The value of the resistors on your board and on the schematic diagram are not the same...even there are missed resistors on your you tell us why?

[pavan]

Man i doubt whether someone has used Arduino as efficiently as you do 🙌 .

[Rintarok]

Do you know if the coding can be adjusted so that the LED screen will show a flow rate instead of rpm, I'm trying to use this on a turbine flow meter

[Dancopymus]

Hello, is it possible to use this code with the TCRT5000? (not module) Thanks

[cjones]

On the quote now page, there is $58.00 showing. What is that for???

[patrickmclaughlin]

No problem with the 'float rev' variable? I usually see 'volatile unsigned int rev' or similar.
Think the rpm display is accurate?

[rigobustamante]

Me gustó el proyecto, me puedes pasar el código para fabricar uno yo también por favor

[cbanosabreu]

YOU CAN PROVIDE GERBER FILES FOR MANUFACTURING

[TheDavidrhd]

Ola. Como faço para zerar a contagem ?

[--KIRUTHIKAP]

please explain the full concept and using things

[yassinelemallem]

Please how to make net fishing with andruino

[motivationramansir]

I want to buy it but what is full name of Arduino.
As Arduino UNO or some other

[mindaugask]

Avoid taking signal from LED, for example if you add a blue LED (voltage drop 2V) you may get wrong results or if any.

[Skibidigamerwahid]

In which principle this circuit work? Can you please give me details about how ir circuit detects the rpm .

[DSB.TecnologiaMaker]

Ok, mostrou como faz, más não mostrou como programa. Pulou a parte wue liga a bateria *_*