Hello, i am following this project: https://drive.google.com/drive/folders/1_hUStY0KOqpF1ZPhrsTKZY1Fm-ZIoOBg It's a simple program to count pulses when pushing some buttons. But when the button is being pushed on all the time, the counts go up also. I need to have only one count added (or subtracted) even when continue to push the button. And after releasing the button it should be ready for the next push / one count, etc. Can this simply be done by some extra code? And if so, how? I presently have omitted this "problem" in an electronic way, but prefer to have it "fixed" in the code. Thanks, Itsu

[image] itsu104: it is not my code Where did you get the link to the pdf, code and hex file? If it wa something like an instructable or havackaday, you cou,d post the link to the website from which you are working. On the other hand, code like this is trivial and I would not expect trouble if you posted it with attribution. a7

Hi Alto, i was / am working from a youtube video. If you search for "Arduino Counter For Winding Machine (0-9999) ||Proteus 8.10" in youtube, you will find the video and in the comments there is the link to the PDF and code. I am building such a coil winding machine and was looking for an up/down counter to count the number of turns on my coil using a magnet and a Hall sensor to track. But if the magnet for some reason stops in front of the hall during winding, then it keeps on counting, like when you keep on pressing the button. Itsu

Have you looked at the StateChangeDetection example as previously suggested ?

Hi Bob, yes i did: https://docs.arduino.cc/built-in-examples/digital/StateChangeDetection/ i guess this part of the code example (loop) is key: // compare the buttonState to its previous state if (buttonState != lastButtonState) { // if the state has changed, increment the counter I will take a shot at it later tonight, thanks, Itsu

There is a bit more to it because not only must you detect that the state of the input has changed, but also its current state Note too that de-bouncing the button inputs is also necessary otherwise the bounces can be counted as multiple inputs

Thanks Bob, not sure if de-bouncing is needed as i will use a Hall sensor as a switch instead of the buttons. The Hall seems to switch cleanly, but i will see. Itsu

Hi Delta, i saw that in the FAQ section, see top of this page. Anyway, as this code it pretty trivial as mentioned earlier, here it is: #include LiquidCrystal lcd(12, 11, 5, 4, 3, 2); int up = A5; int down = A4; int reset = A3; int count; void setup() { lcd.begin(16, 2); pinMode(up, INPUT); pinMode(down, INPUT); pinMode(reset, INPUT); lcd.setCursor(1, 0); lcd.print("TECH SHUBHAM"); delay(2000); lcd.clear(); } void loop() { if (digitalRead(up) == LOW || digitalRead(down) == LOW){ lcd.setCursor(2, 0); lcd.print("Nbr of turns:"); lcd.setCursor(6, 1); lcd.print(count);} if (digitalRead(up) == HIGH){ count++; delay(250); lcd.clear();} else if (digitalRead(down) == HIGH && count >= 1) { count--; delay(250); lcd.clear();} if (digitalRead(reset) == HIGH){ count = 0; delay(250); lcd.clear();} else if (count == 10000){ delay(1000); count = 0; lcd.clear ();} } So the problem i have with this code is that when keeping on pushing the button, (or in my case keep on activating a Hall sensor) the count keeps counting up (or down) while it should act on a single impulse only. I understand it could be fixed by inserting "edge detection" or "State Change Detection" code Regards Itsu

[image] itsu104: I understand it could be fixed by inserting "edge detection" or "State Change Detection" code Correctly, I believe. It's not clear you are on your way with that, see this post and maybe the thread it finds itself on: [image] Storing Button State Programming Questions I normally point ppl to the IDE Examples/02.Digital/StateChangeDetection sketch, and the article that goes with it. Here is an adjustment and reduction of that example, which actually works. And somewhat less code to slog through to get the basic idea. One of the original's flaws is that it does not handle Try it here [Wokwi_badge] State Change Detection This code also follows the IPO model, which is a very useful and very used model for many the things we do with the Arduino. IPO Pr… HTH a7

Thanks A7, nice simulation in that thread :+1: I will see what i can do with all this information, i need to handle 2 interrupts (A4 (Down) and A5 (Up)) with this edge detection (leave the A3 (reset) button as it is) and update the Up and Down counters. Itsu

You've used the word interrupt in the title, and only now speak of "hand [ing]" interrupts. The code you have provided does not use interrupts. If you know nothing about interrupts, or are using the word casually, forget about interrupts. If you know all about interrupts, you would probably not consider using them for this. One question may let us definitively rule out the need for interrupts, and that is at what maximum rate do you expect to press the button, or whatever the equivalent is to the pulses up and down? At this time, with the delay() you are using in your attempt to solve the issue you have observed, the maximum speed of counting is 4 steps per second. At that rate, interrupts are not appropriate. So, how fast do you need to count? Is the code in #15 your code or the code from the video? Is the code in the video meant to be a coil winder counter sketch? It is limited to 4 turns per second, it seems, is that slow for coil winding? I know nothing about coil winding, so. a7

Uno R3 pushbutton interrupt pulse only

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alto777 July 14, 2024, 4:33am 16

Correctly, I believe. It's not clear you are on your way with that, see this post and maybe the thread it finds itself on:

HTH

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Uno R3 pushbutton interrupt pulse only

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