**2.3 Microcontroller boards (ADUC7024 and LPC2368)**

As it is known that the embedded system with the two selected ARM7 microcontrollers which are ADUC7024 and LPC2368 are the developed microcontroller boards, using in this chapter. The first board is used for sampling waveforms and for writing the sampling signals to the external memory and the latter is used for various purposes: (1) reading voltage, frequency and fault detection from ADE7758; (2) storing fault data in SD-CARD up to 2 GB, for communicating with PC or laptop via the Ethernet Network and; (3) controlling the sampling process of the ADUC7024 board. The picture of the two microcontroller boards are shown in Fig. 4 and Fig. 5.

A Power Quality Monitoring System

Fig. 4. The development board of ADUC7024 microcontroller

Fig. 5. The development board of LPC2368 microcontroller

circuit of the external memory board is shown in Fig. 6.

This external memory board is one device of this power quality monitoring architecture to collect the fault data from ADUC7024 microcontroller into its memory in series. The data will be read by the LPC2368 microcontroller board and will be stored in SD-CARD for recalling or downloading later via the Ethernet network when of necessity needed. The

**2.4 External memory board (AL440B)**

Via the Ethernet Network Based on the Embedded System 235

Fig. 3. The circuit of the voltage and frequency measurement and fault detection board

Fig. 3. The circuit of the voltage and frequency measurement and fault detection board

Fig. 4. The development board of ADUC7024 microcontroller

Fig. 5. The development board of LPC2368 microcontroller
