An actual-size PCB layout for the timer kit is shown in Fig. Construction and testingĪssemble the circuit on a breadboard or PCB. Ensure that you select the correct board from the Tools menu in Arduino IDE before uploading the timing_kit.ino sketch file to the board. The sketch/program uses the interrupt and millis ( ) functions of the Arduino. The software (timing_kit.ino) is written in Arduino programming language using Arduino IDE version 1.8.5. It is tested with known values set in a mini programmable logic controller (PLC.) A reset button (connected across CON3) is provided to reset the display to zero and start a fresh timing measurement. Measurement in the range of milliseconds to several minutes is possible. The measured time is displayed in seconds on LCD1. The change-over operation of start contacts initiates timing measurement, and of the stop contacts stops the measurement. Both the contacts can be either normally open (N/O) or normally closed (N/C). It has external input contacts to start and stop the timing measurement. ![]() 2, has few components besides the Arduino Uno board (Board1). The schematic diagram of the kit, shown in Fig. 1: Author’s prototype of the timer kit Circuit and working This timer will be a low-cost solution for laboratory/industrial requirements. It can be used to measure the time delay duration of devices like timer relays, circuit breakers, and other sequential logic circuits. This way, it does not matter if your main loop gets blocked by an interrupt for some milliseconds.Presented here is a simple timer kit built around an Arduino Uno board. Rather just increment it by one second each time. You can avoid accumulating errors over time, by not setting the next update relative to the current time. This answer targets your example using millis(). StartMillis = currentMillis //IMPORTANT to save the start time of the current LED state. If (currentMillis - startMillis >= period) //test whether the period has elapsed Unsigned long startMillis //some global variables available anywhere in the programĬonst unsigned long period = 1000 //the value is a number of millisecondsĬurrentMillis = millis() //get the current "time" (actually the number of milliseconds since the program started) Here is the code I used with millis() and gave me around 12min difference. Any help with this problem or any additional information i am missing which will be useful or any other solution other than using timer2 interrupt will be appreciated. Doesn't that mean Timer2 has a higher priority? My ultimate goal is to do the one-hour countdown. ![]() But is timer1 interrupts priority is higher than timer2? But according to the ATmega328p datasheet, the vector no. In ledP10.cpp there is a callback method for timer1 and it contains loops and may line of code. My guess, it's happening because of the TimerOne library but I couldn't find the solution. When I use only MsTimer2 library the results are something like this. In the interrupt routine, I am printing millis() to see at after how many ms the interrupt occurs. myled.showmsg_single_scroll("this is single led test",2,8,0) Myled.showmsg_single_static((char*)time_buff, 0) Volatile bool xIsInterruptOcuured = false Uint8_t minute = 0, second = 0, hour = 1 But now suddenly my MsTimer2 doesn't generate pure 1sec. ![]() Now what I did is the added both the library in my project and I am doing the countdown. ![]() When I individually run both of the libraries, my scrolling on the display is perfect and my timer library also generates a pure 1sec interrupt. So for countdown i am using MsTimer2 library which usese timer2 of arduino. P10_LED and I need to display the one-hour countdown on the display module. Everyone, I am using, P10 Dot Matrix Display with Arduino Uno.
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