We’re getting five light-dependent resistor readings and we’re also getting temperature sensor readings and the events are happening at the time we wanted them to. As seen in the previous part of this course, an Arduino sketch consists of two main functions called setup() and loop(). Programming Arduino UNO Timers. I already tried making another void loop, but it does not work. great work Michael , really have to work my old brain , but after working through these 6 Videos feel I have a good handle on it There are many methods to achieve a result, and some will argue this is the best way, others will argue this way. I currently can only run LED() first and then once LED() is finished, only then the IR() will run. Let’s make them unsigned long constants as well.The variables we’ve created are named previousTime_1 and previousTime_2 and again they’re both unsigned longs. On each pass through the loop, it looks at the millis() clock to see if it is time to change the state of the LED again. Active 3 days ago. You can stand there holding the hose until it is full. In the while loop, the loop-continuation condition is tested at the beginning of the loop before performed the body of the loop. its good to tackle in details , good for noobs and to those who wants to share their knowledge…, […] Doing multiple timed things with Arduino: Unleash the millis()! For example, you may want a servo to move every 3 seconds, or to send a status update to a web server every 3 minutes. Every good program has an even better algorithm to go along with it, so before we start typing away at the Arduino IDE, first we want to write out our plan of action. Connecting the LEDs. In the sketch above, the first time loop() is called, the delay(10000) stops everything for 10secs before turning the led off and continuing. Find anything that can be improved? If this first line of code is confusing try running some numbers through it. Example Code It looks like about every second we’re getting a reading from our light-dependent resistor. Let’s write our algorithm. Change language ... increment: executed each time through the loop when condition is true. I have found that new comers sometimes get focused on the code, and don't understand what the concept is  ... hence the pool example. It appears as unanswered that may generate confusion on what is the right procedure to follow. There is more detail in that discussion thread. So, we’ve got two independent repetitive events working concurrently. You will receive email correspondence about Arduino programming, electronics, and special offers. I use an analogy of filling a paddling pool. If you’re still confused, definitely check out our last lesson, Arduino Sketch with Millis () instead of Delay (), which explains this explicitly. element14 Software Version: jx, revision: 20190618211432.998b920.lithium_9.0.5.x-jx, // this first part was copied from the "Fade" example with some small modifications (pin numbers, brightness). This is part of a mini-series we’ve been publishing that’s all about using the Arduino millis function to create timed events. The loop() function in the Arduino program skeleton is a sort of "fake"; as a matter of fact it is only a way to tell the CPU "do this sequence indefinitely", but it is not covering the loop following the concept for(..) { } as it is usually intended in C/C++ programming. I have been using an Arduino Leonardo and the sections work fine separately; I just want them to use different pins and run independently, but at the same time. Because it’s an unsigned long it can hold a really big number, like we’ve talked about before. Buy access to all our courses now - For a limited time just 19USD per month with a 30 day satisfaction or your money back "No Hassle" guarantee! Well, bear with me if memory serves and most of the time, the vast majority of the time it does what we’ll do is: we’ll have a power supply here, cetera 24 volts, because I remember these numbers and we have a in Arduino microcontroller here. How are we going to do that? Error: You don't have JavaScript enabled. Let’s use the standard 9600 baud rate. We want to update the current time, and we want to do it frequently, hence why we’re using the loop section. Viewed 25 times 0. As far as I am concerned, if the OP understands the concept, and the result does what they want, then they can refine or improve on it when they need to. We can Help. The toughest part is just wrapping your head around the ‘if statement’ condition. First, we mapped out what we were doing just by writing out our algorithm before we actually get into the code. The Full Code. Those intervals aren’t going to change, so we can make them constants. In your example you use the 'long' declaration but a new comer doesn't understand why unless you point it out  ... yes they could look it up, but will they. If you haven’t seen the previous lessons in this series, we highly recommend that you go back and check them out either now or after this lesson. This is the interval at which we want each of these events to occur. Pin 12 would turn on 1/2 second after Pin 13 turns on. Arduino Sketch with Millis () instead of Delay (), Arduino millis() - The Beginners Guide to multi-tasking with Arduino - Programming Electronics Academy, Map out a program with 2 INDEPENDENT timed events, Code from scratch a program using millis() to time 2 repetitive events, Drink Kool-Aid and watch a beautiful sunset, Event 1: Read/Display LDR Value (every 1 sec), Event 2: Read/Display Temp Value (every 5 sec). Re: How can I run multiple loops at the same time with an Arduino? Welcome to the Machine. So let’s upload the sketch and test it out. The Arduino programming language Reference, organized into Functions, Variable and Constant, and Structure keywords. © 2021 OPEN HARDWARE DESIGN GROUP LLC | PRIVACY POLICY. Therefore, currentTime holds a snapshot value of millis, which will always be counting up from when you powered up the Arduino board. Please keep in mind the focus of this lesson is demonstrating how to code timed events with Arduino, so we won’t go into detail on how to set up your actual circuit for this experiment. Arduino Timers. No ones example, just that there are often several different ways to do something. What we want to do is read these values and display them to the Serial Monitor window but we don’t want constant readings. As you can see this wasn’t too painful to write out. Arduino | Run 2 Function at the same time. Both Timer0 and Timer2 are 8-bit timers (can count from 0 to 255) while Timer1 is a 16-bit timer (0 to 65535). Basically just check the millisecond timer and call a couple of functions at the appropriate times - one function to do the fading for one LED, and the other to do the blinking for the other LED. GREAT THANKS!!! 3: for loop. See the discussion here: http://www.element14.com/community/message/129449/l/re-multiple-arduino-functions-without-delay. (2^32)-1, or 4294967295 milliseconds converts to 49.71027-odd days. By setting the previousTime equal to the currentTime we restore the gap between currentTime and previousTime, allowing for a sustainable repetitive event. We look forward to seeing you next time! Learn everything you need to know in this tutorial. nice tutorial !! Returns the number of microseconds since the Arduino board began running the current program. Then plug in the other jumper wires like this: First, plug a wire from 13 on the … The do while loop is always run at least once before any tests are done that could break program execution out of the loop. Or 2 buttons for control servo and LED independently ? Off the top of my head I couldn't say if a while or for was more efficient, but personally for a fixed number of iterations I would go for a for loop, if I had to do a while loop then I would set I to zero so I could do (i