70 lines
1.1 KiB
C
70 lines
1.1 KiB
C
#define SENSOR_PIN A3
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#define RELAY_PIN 3
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#define SENSOR_SAMPLE_COUNT 50
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#define SENSOR_THRESHOLD 50
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#define RELAY_SHUTOFF_DELAY 5000
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bool RELAY_STATE = HIGH;
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int INDEX = 0;
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int SAMPLES[SENSOR_SAMPLE_COUNT] = {0};
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int getMaxIntFromArray(int *arr, int len)
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{
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int maxValue = 0;
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for (int i = 0; i < len; i++)
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{
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if (arr[i] > maxValue)
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{
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maxValue = arr[i];
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}
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}
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return maxValue;
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}
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int getSensorValue()
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{
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for (int i = 0; i < SENSOR_SAMPLE_COUNT; i++)
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{
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INDEX = (INDEX + 1) % SENSOR_SAMPLE_COUNT;
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SAMPLES[INDEX] = abs(analogRead(SENSOR_PIN) - 512);
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delay(10);
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}
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return getMaxIntFromArray(SAMPLES, SENSOR_SAMPLE_COUNT);
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}
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void setup()
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{
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pinMode(RELAY_PIN, OUTPUT);
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digitalWrite(RELAY_PIN, HIGH);
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}
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void loop()
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{
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int sensorValue = getSensorValue();
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if (sensorValue < SENSOR_THRESHOLD)
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{
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if (RELAY_STATE == LOW)
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{
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delay(RELAY_SHUTOFF_DELAY);
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sensorValue = getSensorValue();
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}
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if (sensorValue < SENSOR_THRESHOLD)
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{
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// Vacuum off.
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RELAY_STATE = HIGH;
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}
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}
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else
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{
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// Vacuum on.
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RELAY_STATE = LOW;
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}
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digitalWrite(RELAY_PIN, RELAY_STATE);
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} |