84 lines
2 KiB
C++
84 lines
2 KiB
C++
// door status on arduino
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// arduino is Duemilanove
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// sensor is a reed sensor
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const int REED_SWITCH_INPUT_PIN = 13;
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const int RED_LED_OUTPUT_PIN = 12;
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const int YELLOW_LED_OUTPUT_PIN = 11;
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const int GREEN_LED_OUTPUT_PIN = 10;
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const int DELAY_TIME = 1000;
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const int MAX_COUNTER = 20;
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const int LOWER_THRESHOLD = 4;
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const int UPPER_THRESHOLD = MAX_COUNTER - LOWER_THRESHOLD;
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const int CLOSED_DOOR = 1;
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const int OPEN_DOOR = 0;
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int measured_state_counter = MAX_COUNTER / 2;
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int published_state = OPEN_DOOR;
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void setup(){
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Serial.begin(9600);
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pinMode(REED_SWITCH_INPUT_PIN, INPUT);
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pinMode(RED_LED_OUTPUT_PIN, OUTPUT);
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pinMode(YELLOW_LED_OUTPUT_PIN, OUTPUT);
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pinMode(GREEN_LED_OUTPUT_PIN, OUTPUT);
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}
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void print_status() {
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Serial.print(" ");
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Serial.print(published_state);
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Serial.print(" ");
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Serial.println(measured_state_counter);
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}
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void update_measured_state_counter() {
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if(LOW == digitalRead(REED_SWITCH_INPUT_PIN)) {
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measured_state_counter = max(0, measured_state_counter - 1);
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} else {
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measured_state_counter = min(THRESHOLD, measured_state_counter + 1);
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}
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}
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void update_published_state() {
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// status check if we can switch the status.
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// low pass prevents waggling a bit
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if (measured_state_counter > UPPER_THRESHOLD) {
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published_state = CLOSED_DOOR;
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} else if (measured_state_counter < LOWER_THRESHOLD) {
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published_state = OPEN_DOOR;
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}
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}
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void update_led_pins() {
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if (published_state == CLOSED_DOOR) {
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digitalWrite(RED_LED_OUTPUT_PIN, HIGH);
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digitalWrite(GREEN_LED_OUTPUT_PIN, LOW);
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} else if (published_state == OPEN_DOOR) {
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digitalWrite(RED_LED_OUTPUT_PIN, LOW);
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digitalWrite(GREEN_LED_OUTPUT_PIN, HIGH);
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}
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if (measured_state_counter == constrain(measured_state_counter, LOWER_THRESHOLD, UPPER_THRESHOLD)) {
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digitalWrite(YELLOW_LED_OUTPUT_PIN, HIGH);
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} else {
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digitalWrite(YELLOW_LED_OUTPUT_PIN, LOW);
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}
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}
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void loop(){
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print_status();
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update_measured_state_counter();
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update_published_state();
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delay(DELAY_TIME);
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update_led_pins();
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}
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