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Adafruit_SSD1306 display = Adafruit_SSD1306 ( 128 , 64 , & WIRE ); DHT dht ( DHT_PIN , DHT_TYPE ); // Data structures. float gas_sensor_readings [ TOTAL_SENSOR_READINGS ], temperature_sensor_readings [ TOTAL_SENSOR_READINGS ], humidity_sensor_readings [ TOTAL_SENSOR_READINGS ]; float average_gas_reading , average_temperature_reading , average_humidity_reading , gas_total = 0.0 , temperature_total = 0.0 , humidity_total = 0.0 ; static int gas_index = 0 , temperature_index = 0 , humidity_index = 0 ; int...