Hello Everyone, I am stuck in a situation. I would like to implement 2 pushbuttons in a stopwatch programm, one to "start/pause" de time and another one to "reset" the displays to "zero-zero". I've been searching in the internet how to do it. Unfortunatelly without success up to now. [image] In the program below I just put the first two digits in order to summarize here... But my desire is that the stopwatch reach 59 seconds and then returns to "0". However, with the 2 buttons I can manipulate it stoping, starting and reseting. void setup() { pinMode(2, OUTPUT); pinMode(3, OUTPUT); pinMode(4, OUTPUT); pinMode(5, OUTPUT); pinMode(6, OUTPUT); pinMode(7, OUTPUT); pinMode(8, OUTPUT); pinMode(9, OUTPUT); pinMode(12, INPUT); } void loop() { // 00 digitalWrite(2, LOW); digitalWrite(3, LOW); digitalWrite(4, LOW); digitalWrite(5, LOW); digitalWrite(6, LOW); digitalWrite(7, LOW); digitalWrite(8, LOW); digitalWrite(9, LOW); delay(1000); // 01 digitalWrite(2, LOW); digitalWrite(3, LOW); digitalWrite(4, LOW); digitalWrite(5, LOW); digitalWrite(6, HIGH); digitalWrite(7, LOW); digitalWrite(8, LOW); digitalWrite(9, LOW); delay(1000);

[image] fermatias: For example, I would like to limite the stopwatch from "0" to "5", instead of "0" to "9" repeatly. byte unitsDigit = seconds % 10; changes to byte unitsDigit = seconds % 6;

Hello @UKHeliBob , regarding to read the input of a button I guess I can do . The problem is how put it in the middle of the program (in this case, into the loop) and how to control it. Att. Fernando

Hi @johnwasser , thanks. It seems to be very difficult for me to implement my program with 7 segments displays into your example. But I will try to study it further.

[image] fermatias: It seems to be very difficult for me to implement my program with 7 segments displays into your example. Is there some part of "This is where you would put your code to display the time" that you don't understand? The time is in milliseconds. If you want to display seconds, divide by 1000. Split the number of seconds into separate digits and display the digits on your BCD-to-7-segment displays: // This is where you would put your code to display the time byte seconds = displayTime / 1000; byte tensDigit = (seconds / 10) % 10; byte unitsDigit = seconds % 10; // Tens Digit digitalWrite(2, tensDigit & 0x01); // Low bit digitalWrite(3, tensDigit & 0x02); digitalWrite(4, tensDigit & 0x04); digitalWrite(5, tensDigit & 0x08); // High bit // Units Digit digitalWrite(6, unitsDigit & 0x01); // Low bit digitalWrite(7, unitsDigit & 0x02); digitalWrite(8, unitsDigit & 0x04); digitalWrite(9, unitsDigit & 0x08); // High bit

Hi @fermatias welcome to the arduino-forum. The forum can be a source of great help to learn the details that are needed to make a microcontrollerproject work the way you want it to. My offer is to point to that things that will "teach you fishing" to beeing able to find bugs yourself. You seem to be a real beginner. So my first question is: do you want the stopwatch beeing up and running quick and dirty as soon as possible? or do you want to learn programming. Which of course will take some time? EDIT: the picture of your wiring seems to be from Tinker-cad arduino. As far as I have experienced it most users here don't like tinker-cad Arduino. because tinker-cad-arduino requires an account. There is another arduino simulator that works without any account. It is called wokwi.com Do you have the real hardware and the microcontroller laying on your table or are you doing pure simulation? best regards Stefan

Hi @StefanL38 , thank you! Yes, you're right. I am a real beginner... I began my studies in the field of electrical/automation this year. This semester, one of the subjects is "digital electronics" and the teacher resquested a final project in order to be approved. Then, the requirements are: "Build a stopwatch with 2 units of 7 segments display by which the time goes from 0 to 59 seconds. Besides, it must have 2x pushbuttons: one to [reset] and another to [pause/start]." The problem is that we didn't have classes about programming/Arduino yet, and I have about 15 days to build this project. I have got already the real microcontroller arduino (by the way, I did some basic programs with leds :slight_smile: Up to now, I can do only exactly what I mentioned by prints in the original post (do a counter from 0 to 59 without buttons handling it). Furthermore, I want to study and learn programming more and more. However, at this moment I would like just to build this project and at least understand the core functios of the programm. Thank you for the suggestion of " wokwi.com". I will check it out and use for learning. Att. Fernando

[image] fermatias: The problem is that we didn't have classes about programming/Arduino yet, and I have about 15 days to build this project. Your teacher asked us to give you these links. [image] Share tips you have come across General Electronics Arduino links of interest. How to use this forum: Example sketches: https://docs.arduino.cc/built-in-examples/ Getting started: https://www.arduino.cc/en/Guide https://docs.arduino.cc/learn/ Basics of C++ on an Arduino Arduino Programming Course Programming course Listing of downloadable 'Arduino PDFs' : Either Google >>>- - - - > arduino filetype: pdf Or click the link immediately below: 100s of PDFs for Arduino [Arduino MASTERCLASS | What can Arduino do? PART …

[image] fermatias: The problem is that we didn't have classes about programming/Arduino yet, and I have about 15 days to build this project. So how many hours per day do have to learn and test?

Maybe about 2 hours from from Monday to Friday and full time at saturday and sunday. Anyway... I will try doing it the best as I can.

Who selected the CD4511 ? Confirm: You are using a common cathode 7 segment display You are using an UNO

Do you have to deliver working hardware in 15 days = Friday 16.12.2022? Is it a must to use a CD4511 (a BCD to 7 segment decoder)? there are much more comfortable to use 7 segment displays. So if you are free to use a different 7segment display I would recommend using a 7-segment display with a TM1637 driver and the library that is written for the TM1637-driver This will reduce the effort for displaying to data[0] = display.encodeDigit(thousand); data[1] = display.encodeDigit(hundred); data[2] = display.encodeDigit(ten); data[3] = display.encodeDigit(one); display.setSegments(data);

How to implement pushbuttons into a stopwatch

Projects Programming

LarryD December 2, 2022, 5:33pm 10

Your teacher asked us to give you these links.

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How to implement pushbuttons into a stopwatch

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