show_quadrature_states/show_quadrature_states.ino

   1 /*
   2  * Show quadrature states of two Hall effect sensors.
   3  *
   4  * Copyright (C) 2018  Antonio Ospite <ao2@ao2.it>
   5  * SPDX-License-Identitier: WTFPL
   6  */
   7
   8 #define HALL_CHANNEL_A 2
   9 #define HALL_CHANNEL_B 3
  10 #define LED_PIN 13
  11
  12 int hall_state_A = 0;
  13 int hall_state_B = 0;
  14
  15 int old_hall_state_A = -1;
  16 int old_hall_state_B = -1;
  17
  18 void setup()
  19 {
  20         pinMode(HALL_CHANNEL_A, INPUT);
  21         pinMode(HALL_CHANNEL_B, INPUT);
  22         pinMode(LED_PIN, OUTPUT);
  23         Serial.begin(115200);
  24 }
  25
  26 void loop()
  27 {
  28         hall_state_A = digitalRead(HALL_CHANNEL_A);
  29         hall_state_B = digitalRead(HALL_CHANNEL_B);
  30
  31         if (hall_state_A != old_hall_state_A ||
  32             hall_state_B != old_hall_state_B)
  33         {
  34                 digitalWrite(LED_PIN, hall_state_A);
  35
  36                 old_hall_state_A = hall_state_A;
  37                 old_hall_state_B = hall_state_B;
  38
  39                 Serial.print(hall_state_A);
  40                 Serial.print(" ");
  41                 Serial.print(hall_state_B);
  42                 Serial.print("\r\n");
  43         }
  44 }