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 NXP Semiconductors

  • Smart Climate Control System

  • Created: Feb 10, 2014

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People are so amazed about smart technology, in which they expect that the system can only be build by engineers, scientists, geeks, and those people who are smart and logical. This project shows that smart technology is not that difficult. Let us set aside for now about technicality, let us think about creativity. The residential, commercial, and industrial area are suffering from large temperature differences. It is caused by insulation, ventilation, proximity to the kitchen, and other areas that produces temperature change. The Smart Climate Control System will allow anyone with a Heating, Ventilation and Air Conditioning (HVAC) system to have greater control over the temperatures in each room. Each could have a remote temperature sensor and vent actuator that is controlled by a main thermostat unit via wireless network. The temperatures in each room area is then dynamically controlled by the user interface much like standard thermostats. If this will be related to an ordinary house, it will be the automation of the exhaust fan, standard fan, aircon, and other furnishings and appliances that could alter the temperature of an area.

This part will discuss the specifications and functions of the devices used, which could be skipped and proceed to the last paragraph of this article unless it is necessary to know the details. The upper part of the design is the I/O side. The voltage source has two outputs, 3.3V for devices such as the wireless transceiver, microcontroller, general purpose input/output (GPIO), humidity sensor, and temperature sensor and 6.6V for the servo motor that requires a higher voltage source than the other devices. The lower part of the design is the main control panel which the voltage source is almost the same with the upper part except for the additional devices such as LCD which is 3.3V and HVAC which is 24V. The I/O side is composed of Xbee Wireless Transceiver that handles the system’s transmission and reception of the data, the main control panel has also the same device with it. The Xbee Wifi S6B provides provide simple serial to IEEE 802.11b/g/n connectivity within I/O devices. The P87C51X2BN microcontroller processes the data from the sensor before it will be transmitted through the transceiver. The PCF8574AT device is a GPIO expander that handles the pin requirements and arrangements of the sensors with pull up resistors to meet the current rating requirement. The relative humidity sensor module or HH10D is used to measure the ambient relative humidity that will be used along with the temperature reading to determine HVAC ON/OFF state and vents open/closed state. The DS1701K temperature sensor is used to read ambient temperature. It is a digital thermometer that provides 9 to 12–bit centigrade temperature measurements and has an alarm function with nonvolatile user-programmable upper and lower trigger points. The temperature sensor and humidity sensor are also available in the main control panel for data comparison. The 900-00008 is a 4.8-6.0V servo motor with a control system of +pulse width control of 1500 microseconds neutral and ideal for inexpensive application. The main control panel is also composed of different devices aside from sensors, it has also an LCD which is used for the monitoring and the Home HVAC for the heat, cool, and fan control.

It is very applicable to environmental problems and also the concept is very simple. The sensors which sense the environment; the microcontroller that analyzes the data; the servo motor and HVAC system that executes the reaction to solve the climate problem; and the system flow which is purely basic. It is ideal for students and other individual who are interested in smart technology.