Design and implementation of the ELIQ Smart-plug system device
Examensarbete för masterexamen
Embedded electronic system design (MPEES), MSc
The company Exibea AB plans to design and implement a new product called ELIQ Smart-plug device to help the households control the energy consumption at home more conveniently and intelligently. The expected function of the ELIQ Smart-plug device is to measure the power consumption value of the connected electrical appliance, send the measured value to the ELIQ Display Unit through RF wireless communication, switch on or switch off the power supply to the connected electrical appliance automatically and repeat the received ELIQ protocol RF message to work as a wireless repeater for other ELIQ devices in the company. This master thesis explores the design process and the implementation method of the ELIQ Smart-plug system device including both of the hardware part and software part in depth. MSP430AFE233 is chosen to be the microcontroller unit used on the Smart-plug electrical board to control the whole system. In order to calculate the power consumption value, the RMS (Root Mean Square) values of both of the voltage and current on the connected appliance should be measured firstly, then the power consumption value will be obtained easily by multiplying the voltage RMS value and the current RMS value. The calculated power consumption value will be encoded and combined with some other specified bits such as preamble bits and header bits together into a data packet according to the ELIQ protocol. The data packet will be transmitted to the RF module on the Smart-plug electrical board through SPI communication firstly, then the wireless communication between the antenna of this RF module and the antenna of another RF module on the ELIQ Display Unit board will be implemented. The power consumption value will be displayed on the ELIQ Display Unit device to show the households the transient power consumption of the connected electrical appliance. The Smart-plug device can also switch on or switch off the power supply to the appliance automatically according to the measured power consumption value to achieve the aim of energy-saving in a house. In addition, this Smart-plug device system can repeat the received RF message from other ELIQ devices and then send the same RF message to the ELIQ Display Unit or the ELIQ Hub to work as a wireless repeater in order to extend the wireless transmission distance and amplify the power of the signal. Furthermore, the comparison of selecting components for the Smart-plug electrical board and some important attentions need to be considered in both of the hardware design and software design are discussed in this master thesis.
Data- och informationsvetenskap , Computer and Information Science