Aww. You are so nice. Thank you

I'm glad I could help. Cheers

I am so happy to hear that. Thanks for the comment

LOL i have to do the exact same on an 1993 Audi 100.

That's awesome! I am really happy that I could help.

@@interlinkknight it worked like a charm! Now I need to refine it and include it in my full sketch. Thank you again!

@@interlinkknight when I said refine I wasn't saying it's not good. I mean to Match the rest of my code! No misunderstood here, thanks again

I understand. Don't worry. Good luck with your project.

@@interlinkknight InterlinkKnight please show how to automatically lock a car when the car reached 40 kmph and AUTO unlock when engine is off from start. Awaiting with much appreciation. Thanks.

Thanks for those words. You have no idea how happy I am knowing that I could help you in that way. Your comment makes me smile :) Good luck.

@@interlinkknight InterlinkKnight please show how to automatically lock a car when the car reached 40 kmph and AUTO unlock when engine is off from start. Awaiting with much appreciation. Thanks.

@@tnamen1307 You should be able to do that with a simple loop + function. When RPM > SETVALUE = Lock(1) and set lock to one on setup

Great!

:)

Thanks :)

Cool! It's always nice to know I could help. Good luck

That's great. I'm glad I could help

That's great! I'm glad you like it :)

No problem

@@interlinkknight I have a project to.auto lock and unlock car please show how to automatically lock a car when the car reached 40 kmph and AUTO unlock when engine is off from start. Awaiting with much appreciation. Thanks.

I'm glad I could help

I'm glad I could help :)

I'm glad I could help

Hi sir can you help me for code for esp32 ?

@@interlinkknight thanks for sharing really help me

Wow anyway u could share code?

Was it?

where i can write it?

I'm glad. What was your idea?

@@interlinkknight actually I have a 3D printer and its filament sensor is only detecting filament either 0 or in 1 condition but I want to make a device which detect while filament is stucked ( non moving position ) for few seconds

@@interlinkknight please advise will it work or not

Yeah, that would work. Make a wheel spin with the filament and a few magnets on the wheel. With the hall effect sensor detecting the rotation, if for a while doesn't detect pulses, then create an action like an alert. Although it has to detect if it's printing or not, so that way doesn't alert you when you are not printing.

@@interlinkknight thanks dear

That's cool!

@@interlinkknight I already did build this set with Hall sensor and your program calculation quite accurate on Frequency reading compared with my Frequency Counter. Thank you.. Nice work

I'm glad. I'm happy to help :)

@@interlinkknight I have Question , Can I use the Basic NX4832TO35-011 instead of Enhanced version on this HMI file? because cost too expensive for the Enhanced version

Yes

Thanks for your kind words. I'm glad I could help.

I don't recommend adding another sensor. To read low speed you just need more magnets in the wheel/shaft. The more pulses per revolution, the lower RPM you can measure

Not sure what do you want me to do. I already show the connection and i provided the code

It's called "Nextion display" and I designed the graphics using the Nexiton Editor. I made a few video tutorials about that display, so you can check it out

Someone told me they tried it and worked. The arduino uno/nano has 2 interrupt pins (pin 2 and pin 3) so just use those. Let me know if works

I think you can just add a simple equation that converts RPM into speed

Hi Alejandro, maybe does your project requires a tft lcd module?

The smoothing takes multiple readings and average them

I have a lot of comments around that line in the sketch explaining what it does. Line 238: // Change the amount of readings depending on the period between pulses. // To be very responsive, ideally we should read every pulse. The problem is that at higher speeds the period gets // too low decreasing the accuracy. To get more accurate readings at higher speeds we should get multiple pulses and // average the period, but if we do that at lower speeds then we would have readings too far apart (laggy or sluggish). // To have both advantages at different speeds, we will change the amount of readings depending on the period between pulses. // Remap period to the amount of readings: int RemapedAmountOfReadings = map(PeriodBetweenPulses, 40000, 5000, 1, 10); // Remap the period range to the reading range. // 1st value is what are we going to remap. In this case is the PeriodBetweenPulses. // 2nd value is the period value when we are going to have only 1 reading. The higher it is, the lower RPM has to be to reach 1 reading. // 3rd value is the period value when we are going to have 10 readings. The higher it is, the lower RPM has to be to reach 10 readings. // 4th and 5th values are the amount of readings range.

What you need is a schmitt trigger to filter noise, but I prefer using sensors with included filters, like that ones I mention in the video. As far I know, those computer fans already have a filtered sensor. Only one way to find out (trying). I guess you don't have an oscilloscope? That would help to see if the signal is clean. Basically if works, it's fine. If you see weird readings, then you need to add the schmitt trigger. I hope it helps. Good luck

Yes

You use a 3D printed disc with 36 magnets, every 10° and run the hall sensor to the first interrupt pint of an arduino uno.. Then you use the library "elapsed Millis" which also features a elapsed micros time.. You setup the interrupt and a big variable You start the timer You enable the interrupt and set the time to 0.... When interrupt hits you store the time in an array or whatever you want... You get declaration by declining timer events, arduino uno is very much fast for this if your code is efficient

@@MoesKeckeEcke thanks for the reply!

I'm glad you like my projects. About your problem, I'm guessing you are using a different hall effect part than mine? You put the pullup resistor in the output?

That's interesting. I never done that but what comes to my mind is something similar with what I do with smoothing the RPM, which it stores several values in an array of variables. You just have to do simple math between the current reading and the old reading.

@@interlinkknight thanks a lot for your reply. I realized the current and previous recorded RPM values are saved in the array in your smoothing code, like you said. Now, to get the time that has passed between the instant those two RPM measurements were taken, would that be equal to your "PeriodBetweenPulses" value, or would I need to set up a new array with the timestamps corresponding to the RPM values?

I would do a new array, so the values are smoothed already. To get the time that has passed, you need to record the time in a variable using the micros function

I show that in the video

@@interlinkknight thanks for the reply. I do see the schematic showing the pull up resistor for the sensor, but what about the rest of the tachometer. I'm a little ignorant

You mean the display? The pins are listed on the sketch comments, on the top

@@interlinkknight we don't see any schematic for the sensor wiring

What's the name of the variable you are changing? For slow speeds, I recommend having a lot of pulses per revolution

Like I mentioned on the video, you need to add a schmitt trigger to remove the noise of the signal. Or use a sensor that already has it included.

You could run that program without affecting the tachometer code because the tachometer counts the pulses using interrupts that are not affected by the main loop

I'm not using any unit there so don't pay attention to how many zeros does it have

Of course you can change the trigger type. The only thing you might want to change is the pulses per revolution. By default it's 2 pulses per revolution, but each person put different amount of magnets in their wheel/shaft

Of course you can. Using PWM. But those gauges are not always linear so you might need to add a asymmetrical remap

InterlinkKnight many thanks, a bit more learning for me.

I already did a few video tutorials about that display. It's called nextion display

@@interlinkknight okey i will check it later, thanks😁

An op-amps can send a signal to arduino. The real question is: can you really get a clean signal from that setup?

Of course. Remap the rpm to whatever you calculate the mph is. I mean, to really say how many mph is in rpm depends on you setup. You can't say the speed of a disc in mph, for example. You would have to convert the motion in to linear.

@@interlinkknight please help how to AUTO lock and unlock car after reaching some speed. Thanks.

No idea what could be the problem. But since you also have a problem with a library, the cause might be on the code for the 7 segment display. What I do in those cases is to copy parts of the code, one a the time and see when stops working.

@@interlinkknight Many thanks for the answer! the problem where on the fastled library, I changed it to Adafruit_NeoPixel.h. Now I have woking the RGB led Strip as a shift light and the 7 segment display showing the rpm. Your code is the best with diference because you have real time rpm. Congrats and thanks for sharing!!

I'm glad I could help :)

You can clearly see it in the video. It's only 2 magnets. And yes, "PulsesPerRevolution" is equal to the number of magnets. In my example you can clearly see that by default is 2.

I'm not sure you want to measure the belt instead of the roller

Search on google for "Arduino if function"

Maybe add a pull-up resistor. The problem is your sensor

If you need to use an IR sensor, just keep it enclosed so it doesn't get external light. And if you have to use a sensor that is very noisy, you need to add a schmitt trigger which will filter the noise. You can make one with an op-amp and a few resistors. This would only work if the output of the sensor is analog, not digital.

Using Schmitt Triggers

@@interlinkknight Thank you very much for your suggestion! I will try that.

You can always do anything you want with the display

@interlinkknight Can you advise how you would shift it to the center ? Thanks

Do you mean the OLED display? You would have to put a few if statements that if RPM is between 0 and 9 the text x position is a value in the center. If RPM is between 10 and 99 the text x position is a value in the center. If RPM is between 100 and 999 the text x position is a value in the center. Etc.

It's a bunch of images. I explain that on one of the video tutorials about the nextion display. Also, the file is in the description so you can open it and see

@@interlinkknight thanks, I know it’s a bunch of images and have found the images in the file. I was wondering if the images were generated with some kind of scripting tool. I don’t fancy doing 208 images by hand in MS paint

I did it in Photoshop and PowerPoint

Yes, that's the lone that selects the pin. But you most use a pin that has an interrupt. In the Arduino uno and nano it's only pin 2 and pin 3. This means you can't use pins 4, 5, 6, etc. Why? We need to use a pin with interrupt because that's the only way to be sure it never miss a pulse, no matter how quick is the pulse

100% you are not going to have problems with that speed. I've seen it measuring above 50,000 RPM with 2 pulses per revolution.

👌👌@@interlinkknight

No idea what sensors they have so I can't know for sure but it should work

I haven't test at such high speed, but it should work

I'm sorry but I don't know anything about converting Arduino code to esp32

I made another code for 2 sensors at the same time. Check it out in the description of the video

@@interlinkknight Thank you, I will check to see how you did it. What I did to use 2 sensors was to duplicate the code with different names, including two different loops to use with two attachinterrupt from two different pins.

You are right. Everything is duplicated with different names

Hey! For me, knowing that I'm making a positive difference in the world, however small, is enough. But if you want to become a patreon it would help me.

@@interlinkknight guy please i need to get in contact with you.

Of course you can, but you need to separate the decimal numbers yourself with different objects