External interrupt using hall effect sensor with Arduino based PLC

Software

This simple sketch allows us to perform digital reading counting of the Hall Effect Sensor every 1 sec. For this, we have used the input I0.5 of our M-Duino 21+. I0.5 allows external interrupt functionality, so we must add the attachInterrupt() function to set the interrupt functionality. 

As a test, we will check the result monitored by the serial port, open the serial monitor to see the counting levels.

/*

   Copyright (c) 2018 Boot&Work Corp., S.L. All rights reserved

   This program is free software: you can redistribute it and/or modify

   it under the terms of the GNU Lesser General Public License as published by

   the Free Software Foundation, either version 3 of the License, or

   (at your option) any later version.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License

   along with this program.  If not, see <http://www.gnu.org/licenses/>.

 */

////////////////////////////////////////////////////////////

volatile int counter = 0;

void setup() {

   Serial.begin(9600L);

   attachInterrupt(digitalPinToInterrupt(I0_5), count, RISING);

   Serial.println('Hall Effect Sensor started');

}

////////////////////////////////////////////////////////////

void loop() {

  Serial.println(counter);

  delay(1000); 

}

void count() {

  counter+=1;

}