1/1/2024 0 Comments Arduino delay secondsThe reason we’re using the unsigned long data type is because the value for millis gets really big. The variables we’ve created are named previousTime_1 and previousTime_2 and again they’re both unsigned longs. Let’s make them unsigned long constants as well. Those intervals aren’t going to change, so we can make them constants. We want to read and display the temperature sensor every 5,000 milliseconds. This is the interval at which we want each of these events to occur.Īs previously mentioned, we want to read and display the light-dependent resistor value every 1,000 milliseconds. We need to create two constants and two variables. Next let’s setup variables for the timed events. To Do: Sensor Pin ConstantsĬonst byte LDR = A2 //Light Dependant ResistorĬonst byte tempSensor = A4 //LM34 temp sensor We’ve assigned analog pin A2 for the LDR and analog pin A4 for temp sensor. they will never change, so let’s make these constants. The sensors are always going to be at these pins, i.e. The first thing we need to do is set up some pins for where we’ve got our sensors attached. This is just one technique that’s useful to split the algorithm into chunks. Code… From SCRATCH!īefore we get too crazy, let’s write ourselves a little “to-do list” in comments. OK, assuming you have a functioning circuit (or not, you can follow along without one), let’s jump into the Arduino IDE and start coding this bad boy from scratch. If you’re wondering how to wire a circuit like this, definitely check out the website for lessons on setting up different circuits. We’ve included a schematic below as one possible way you could set it up, or even easier, you can use our Kit-on-a-Shield which makes programs and experiments like this super easy. 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. Luckily for us, we are using the millis function instead of the delay function, which would make this MUCH more difficult. When we lay this out on our timeline, we see that we have two events that overlap every five seconds. This is especially true when you have overlapping or concurrent events. When you’re creating a program that has repetitive timed events it doesn’t hurt to lay out the timing of the events on a piece of paper. println(), to display those values to the Serial Monitor Window on our computer. Then we could use functions from the Serial library, Serial. Looking at this it appears we could use the Arduino millis () function to set up the timing for these events, and we could use analogRead () to read the LDR and the temperature sensor values. Think of the algorithm as our plan of action.
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