For this we will use the PCICR register, in which we will indicate on which port we want to activate the interrupts.ĭon’t be scared yet, using it is very easy. It is very important to know this, since to activate interrupts on a pin we will have to know which group it belongs to and activate the group. Finally we have the PD port, which corresponds to the group of pins PCINT16 to PCINT23, corresponding to digital pins D0 to D7.The second port we see is the PC, which corresponds to the group of pins PCINT8 to PCINT13, corresponding to pins A0 to A5.First we will find the PB port, which corresponds to the group of pins PCINT0 to PCINT5 and which are pins D8 to D13.In this diagram we can see the different groups of pins that there are, which are named as PB, PC and PD: To do this, the first thing we have to learn are the different groups of pins that there are, for which we can take a look at this image: In this first part we will learn how to activate each of the interrupt groups in order to use it. Port Registers That Will Trigger Interrupts (PCICR) Pin registers that will trigger interrupts (PCMSK).Register of ports that will trigger interrupts (PCICR).To understand it better, I will divide this guide into three parts: These will be activated whenever there is any change of state on the pin, either from HIGH to LOW, or from LOW to HIGH. Of course it has its disadvantages, and the main one is that you cannot indicate when to trigger the interrupt as you would with hardware interrupts. The advantages of PCINT interrupts are that you can use any pin on the Arduino to trigger them (which is quite useful). Earlier we talked about hardware interrupts (INT), which were limited to certain pins depending on the Arduino model. NewPing sonar (TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE) // NewPing setup of pins and maximum distance.Today I am going to bring you something a little more advanced in Arduino, and it is the way to use PCINT Interrupts (Pin Changes interrupts), in Arduino. Here’s an example code: # include # define TRIGGER_PIN 9 # define ECHO_PIN 10 # define MAX_DISTANCE 400 // Maximum distance we want to measure (in centimeters). Using the NewPing library we can get the distance with just a single line of code. Then according to those results we calculated the distance based on it. In the previously explained code we manually triggered the sensor and measured the received signal pulse duration. There are actually a simpler and better way to program the Arduino to measure distance using the HC-SR04 ultrasonic sensor, and that’s using the NewPing library. void setup () Code language: Arduino ( arduino ) Example Code Using the NewPing Library In the setup we have to define the trigPin as an output and the echoPin as an Input and also start the serial communication for showing the results on the serial monitor. Int distance Code language: Arduino ( arduino ) defines pins numbers const int trigPin = 9 Then we need a Long variable, named “duration” for the travel time that we will get from the sensor and an integer variable for the distance. In this case they are the pins number 9 and 10 on the Arduino Board and they are named trigPin and echoPin. } Code language: Arduino ( arduino ) Code Explanationįirst we have to define the Trig and Echo pins. Prints the distance on the Serial Monitor Serial. Reads the echoPin, returns the sound wave travel time in microseconds Sets the trigPin on HIGH state for 10 micro seconds digitalWrite(trigPin, HIGH) Clears the trigPin digitalWrite(trigPin, LOW) begin( 9600) // Starts the serial communication PinMode(trigPin, OUTPUT) // Sets the trigPin as an Output pinMode(echoPin, INPUT) // Sets the echoPin as an Input Serial. */ // defines pins numbers const int trigPin = 9 Ultrasonic Sensor HC-SR04 and Arduino Tutorial Here’s a code for measuring distance using the HC-SR04 ultrasonic sensor and Arduino. As an Amazon Associate I earn from qualifying purchases. Breadboard and Jump Wires ……… Amazon / Banggood / AliExpressĭisclosure: These are affiliate links.Arduino Board …………………………… Amazon / Banggood / AliExpress.Ultrasonic Sensor HC-SR04 ………… Amazon / Banggood / AliExpress.You can get these components need for this tutorial from any of the sites below: The Ground and the VCC pins of the module needs to be connected to the Ground and the 5 volts pins on the Arduino Board respectively and the trig and echo pins to any Digital I/O pin on the Arduino Board.
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