Add comment on I2C pin connections
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 *   - digital pin D2: DHT22 temperature and humidity sensor 
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					 *   - digital pin D2: DHT22 temperature and humidity sensor 
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 *   - analog  pin A0: MQ135 gas and air quality sensor
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					 *   - analog  pin A0: MQ135 gas and air quality sensor
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 *   
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					 *   
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					 *  Connect the ESP8266 D1 to ATMEGA A5 and D2 to A4 for I2C communcation.
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					 *  
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 *  (C) 2019 Macrocell - Environmental Sensing Solutions (MESS)
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					 *  (C) 2019 Macrocell - Environmental Sensing Solutions (MESS)
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 *   proudly presented by Macrocell - FPGA Innovators
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					 *   proudly presented by Macrocell - FPGA Innovators
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 */
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					 */
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