Tachometer (RPM Meter) || DIY or Buy || How a 3€ sensor outdoes a 29€ product!

I'm generally useless with code, but would there be an easy way to add a peak rpm readout to the display (over a ~350ms window say) that could be reset with a momentary switch? Thanks for the great video!

hehe

Its almost 3 years. Now its time to upgrade with ESP8266 webpage base, display the RPM value on the webpage of ESP8266.
This will reduce the cost of making it.

Used one of these sensors with my oscilloscope. The problem I had was as soon as I went outside the IR from the sun messed up the sensitivity range.

Currently trying with a 38khz tv remote receiver and ir led transmitter.

I love you scott

ya,,, 300/150rpm... maybe start by using it correctly... shaft gotta go directly above it, not on the side... now theres a ratio the motor shaft been smaller.... its normal its giving 150rpm, the shaft of the tacho is turning at 150 man... (thats with other conic part that you've shown but didnt use at all)

Is it possible measuring two RPM's simultaneously? ...and further more to compare which one of the two is higher?

Would that code also work with an ATtiny88 chip ?

Thank you for the author's release, very practical test device, very suitable for professional technicians: electrician/car repairman/industrial...etc, I like this project, I will create and assemble a 3D shell (There is no need for any circuit board PCB, as long as the distribution line is enough), it will not be long before I will post a comment on the shell 3D printing to stl to share with everyone

optically the issue is the pulse rises and falls on the black tape.

Excellent, great with great details there is no any misleading information.

Is it possible to make the same rpm meter while using a 8266/esp32 chip instead?

Thanks for this , I built it but was getting twice the rpm my scope said ! I have changed 120 in the code to 60 and now it works perfectly.

Thanks for a great project.
I am going to run it off of an 18650 a fuse instead of the charging board . On the occasions I want to use it I will put in a battery. This keeps costs down for something it will use now and again.

This sketch wont compile for Pro MINI. uses 123% of available memory! how do yo runthis with pro mini??

the roller adapter would only give you a correct reading if the shaft of the motor is the same diameter as the roller, otherwise you'll get a different "gear ratio", which will cause the values to be off

Awesome, how did you calculate the minimum and maximum rpm? I suppose you could measure lower rpm with more pulses per revolution? (Two pieces of white tape on the shaft instead of one)

@GreatScott! I can't find the code

I can't find the code

Great Video.. do you have video for rotary incremental encoder or absolute encoder?

halo sir i will make it but its not proper work

I'm making a similar rev. counter, but I'm finding that the edges produced by the IR sensor are very noisy; it looks like it will need an additional Schmitt trigger to work reliably - the ESP32 board that I'm using never sees less than two interrupts per transition.

[edit: I seem to have cleaned up the edges very substantially by putting a 680 pF cap. between the IR o/p and ground - it slows the rise time from about 10 us to 20 us, but the ESP32 seems perfectly happy with that - so maybe there is no need for a Schmitt trigger after all]

hi, why did you use Protection board , when the battery has its own?

can i use an uno instead of pro mini?

That thing you do with your pen (going over and over the letters/lines/words) makes me uncomfortable. Just saying.

@GreatScott! With some tuning to the code would this work as an object counter as well?

Can this ir sensor measure about 30000 rpm or it would be out of range?

measuring below 20rpm is still useful

Nice job. Great project.

Till what turning speed (rpm) does this work? I want to measure a speed of a BLDC of around 40.000 rpm.

Did you build your 3d printer or buy?

Hi I am a hobbyist. I fallow your blogs but can"t write Code, So can you write Code for Liquid Crystal 16x2 I2c. i would like to make it with Liquid Crystal 16x2 I2c. Thanks

Wouldn't it be better to computer a moving average rather than the time between each sample? It seems as though a longer sample would give more precise results.

Love it 🙏

I have a question. Should any Arduino library be used for this code?

Great, I was having a plan to get a laser tachometer for my small cnc now I will build it. But the optical sensor can measure high speed rpm ? Like 8K rpm or more for the spindle

Hello sir. I would have a question. How can I determine my measurement tolerance in a system we have created in this way? What margin of error do you think the rpm you get with your microprocessor has? can i say +-5RPM or is it larger than that?

Cheap product always made in .....

Nice project but I'm getting either SLOW! or 14448 using the serial monitor.

Thanks for this project - works great for me. Even at high RPM values. One weird thing i had was that i've to use the analog output of the TRS5000 sensor module - had too much noise on the digital out with this code so I would get random numbers in the 5 digits even when i was testing with a 200rpm motor. With the analog output it works great though. At the end i've used the analog output with an additional schmitt trigger. So if anybody else should have a problem with the digital out of the sensor ....try the analog out.

contact measurement must be coaxial. Putting it on the side will never give the good value due to different diameters of the rods

ask for arduino code

I already have several of these parts in my prep box. I think I could make it for about $6 :)

Is the speed dropping in the tachometer since an external torque has to be applied to rotate the tachometer?

Homemade products are the best, greetings from Mexico

Just got mine to work : = )) Had to change the resistance pot some to get to start reading.

I hate watching yr video. 🤣 i realized how stupid i am. Thats nice. I can apply to count the rpm for my electric outboard motor
Thank u so much

I'm so going watch all your videos today.

Forget about Marvel or Disney....thanks for great entertainment.

The ATMega328 has an internal comparator that could be used instead of the other circuit board.

Great Scott, I am big fan of you and you never make mistakes but I am afraid this time you did using the tachometer attachment incorrectly to measure the RPM.
The way you used the attachment measures the linear travelling not the RPM. To measure the RPM tachometer attachment must be coupled with the motor shaft, face to face, not the side by side.
In your case change in shaft diameter would change the reading.

Great video !! in the schematic of IR distance measuring sensor there is hystersis resistor connected between the output and the non inverting input are you sure this is not there or did you miss it ? Those square are just too perfect lol may be C1 is acting like a damping cap but still never seen such a beautiful square wave on any comparator without a hystersis or at least it is a good practice.
Secondly at the beginning of the video would be nice if you mention the applied voltage to the motor and the current consumed by it at no-load so optically measuring the speed and current consumed when you probed it with the rotating shaft of the tachometer it is just for my interest thank you for your videos...