However, if, at any time the state has changed (low->high or high->low) I want to reset the timer to zero and start over again. If the state is LOW and has not changed, I want it to automatically switch to high (ie: shut off the lights). What I want to do is to constantly poll the digitalRead of GPIO_0 and GPIO_2 for a period of one hour. I realize it cannot work without having a way to manually toggle the states using pushbuttons or other form of control.) I just want to keep the example simple for academic purposes. I really just need help with the timer code. In fact, the sample sketch doesn't show any manual light control. (I am toggling these with pushbuttons on RX & TX, but do not plan to use those pins in the timer function and have not included that in the sample sketch. I will be using millis() to do this.įor purpose of this question, I have defined pins GPIO_0 and GPIO_2 to control the relays for the lights (active low). Now I would like to add a timer to the lights so that if one is left on for an hour it shuts off automatically. I have working code (running on an ESP8266-01 in Arduino IDE environment) to turn two lights on/off using two pushbuttons and the avd_web_Switch library. This way, it does not matter if your main loop gets blocked by an interrupt for some milliseconds.Relative noob seeking advice on this code I have adapted form online examples. 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) Sprintf((char*)time_buff, " %d%d:%d%d:%d%d", (hour/10), (hour%10),(minute/10), (minute%10),(second/10), (second%10)) 3,983 29 Download By ForceTronics ForceTronics Store Follow More by the author: In this Instructable we take a look at the Watchdog Timer on Arduino and the three different ways to configure it. Volatile bool xIsInterruptOcuured = false The Arduino Countdown Timer is a fun weekend project for beginners who wants to move on to something slightly more advanced. 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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