2011年1月2日 · Why the L at the end? What does it mean. The L declares that the value is a long. Without the L, the value of duration * 1000 would be interpreted as an int, which can hold a maximum value of 32,767, limiting duration to a maximum of 32. With the L, duration * 1000L is treated as a long, which can hold a much larger value.

2016年7月27日 · It means 1000 as a long integer and in this context is used to make sure that the multiplication "duration * 1000" results in a long integer and does not overflow (as it could do without the L).

2022年10月31日 · This topic was automatically closed 180 days after the last reply. New replies are no longer allowed. Topic Replies Views Activity peculiar Arithmetic Programming 7 577 May 5, 2021 Confused re long Programming 7 383 March 21, 2024 Problem when storing result of multiplication as a "long" variable Programming 12 5529 May 5, 2021 x * 1000L - what does the L do Syntax & Programs 3 21259 May 6 ...

2017年7月25日 · Hi there I am new at Arduino and at this forum. I do not understand completely the Arduino sketch philosophy. Assume I would need to call 3 functions to run my code, my question is how many Timer.setInterval functions should I …

2011年5月11日 · When you change millis () to micros () in those two places you should also change: this->step_delay = 60L * 1000L / this->number_of_steps / whatSpeed; to this->step_delay = 60L * 1000000L / this->number_of_steps / whatSpeed; That calculates the number of microseconds between steps to get the RPM speed specified. Try a super- slow speed like 30 RPM (1/2 revolution per second) for testing. Then ...

2011年1月10日 · So I am working on a DIY electronic timer for a pinewood derby track. I found a general 2 lane schematic and program from the Derby Talk forums: Will GP Software communicate with an Arduino? - Derby Talk I believe I have made most of the necessary changes to use it for a 4 lane track. However, I am not a programmer, with a very rudimentary knowledge of programming. The timer will be utilizing ...

2017年10月2日 · The programs presented here overlap with those in that thread but I have put my own spin on using millis () and described the programs in my own way. Between the two you should have a clearer understanding of how to use millis () for non blocking timing. In this thread I will try to explain the principles of using millis () for timing and apply it to some common areas where questions arise ...

2017年7月20日 · You declare variables in the scope of setup (), and you try to use them in the scope of loop (), so the compiler tells you that you haven't declared them to be used in the scope of loop () . . . . What's the confusion? Put your variable declarations before setup () by where all of your #define 's are and they'll be global.

2017年11月16日 · Hice un proyecto con Arduino y me gustaría compartirlo con ustedes ahora que se aproximan las fiestas navideñas. El proyecto consiste en montar un circuito que incluya un buzzer pasivo (speaker) y un fotosensor LDR conectados a Arduino REV Uno (en mi caso). En este caso, es necesario alimentar el proyecto con una pila de 9V (es lo que usé) o con una bateria LIPO o similar. Todo estaría ...

2021年3月13日 · Not all boards define data pins as "D0", "D1", etc. Many just use 0, 1, etc. Try just: int Dsensor = 0; // Refrigerator door sensor And see if that correctly maps the pin.