70 lines
1.5 KiB
C++
70 lines
1.5 KiB
C++
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#define FAN_PIN 9 // D9
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#define L_LED_PIN 13 // D13
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#define BMP280_I2C_ADDRESS 0x76 // BMP280 conneciton: D1 = SCL; D2 = SDA
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// minimum value to start both fan's is 110
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// without queeking noise is 255
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#define FAN_ON_TEMP 26.0
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#define FAN_OFF_MAX_TEMP 24.5
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#define FAN_ON_STATE HIGH
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#define FAN_OFF_STATE LOW
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#define BMP280_CHECK_INTERVAL_MS 2000 // every 60000 = 60 seconds
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float bmp280_temp = -99.9;
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uint32_t bmp280_lastcheck_millis = BMP280_CHECK_INTERVAL_MS;
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uint8_t fan_state = LOW;
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void setup()
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{
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// put your setup code here, to run once:
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// setup serial
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Serial.begin(115200);
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Serial.println();
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delay(1000);
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// setup BMP280
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Serial.println("Sensor BMP280 init status: " + String(sensor_bmp280_begin(BMP280_I2C_ADDRESS)));
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bmp280_temp = sensor_bmp280_temperature();
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// setup FAN Pin
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pinMode(FAN_PIN, OUTPUT);
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pinMode(L_LED_PIN, OUTPUT);
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}
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void loop()
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{
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// put your main code here, to run repeatedly:
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if ((bmp280_lastcheck_millis + BMP280_CHECK_INTERVAL_MS) <= millis())
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{
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bmp280_temp = sensor_bmp280_temperature();
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Serial.println("Temperature: " + String(bmp280_temp) + "°C");
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digitalWrite(L_LED_PIN, HIGH);
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if (fan_state > 0 && bmp280_temp <= FAN_OFF_MAX_TEMP)
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{
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fan_state = FAN_OFF_STATE; // off
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}
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if (bmp280_temp >= FAN_ON_TEMP)
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{
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fan_state = FAN_ON_STATE;
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}
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Serial.println("FAN state: " + String(fan_state));
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digitalWrite(FAN_PIN, fan_state);
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digitalWrite(L_LED_PIN, LOW);
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bmp280_lastcheck_millis = millis();
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}
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}
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