In [7] and [8] a microcontroller-based DAS is used in a remote PV plant. The measurement system Dasatinib msds uses a silicon-cell pyranometer as a solar radiation sensor. The sensor data is collected by an internal A/D converter of the microcontroller and stored in a serial I2C EEPROM until uploaded to a portable computer. Keeping the DAS in a low-power Inhibitors,Modulators,Libraries mode, which is only interrupted when measurements are to be taken or when a computer is connected to retrieve the stored data, it is possible to minimize the power consumption. An on-chip timer provides a way to change operational conditions, whereby changing the low-power wait mode at 10-min intervals to sample and store the data. At the end of each data collection period, the acquired data is transmitted to the computer through a RS-232 serial interface.
In [9] a DAS applied to a PV plant that is capable of delivering 5 Inhibitors,Modulators,Libraries kWp of electrical power was described. Temperature, irradiance, array voltage and current data are acquired, processed and then transmitted. The system comprises sensors, DAS, wireless access point and computer, enabling users to access the array parameter via a wireless connection. Three current sensors with a maximum current value of 50 A and a sensitivity of 37.8 mV/A, are connected to the dc array output, while irradiance and temperature sensors are placed around the array. For voltage acquisition, a voltage divider was used, which means 10 mV for every one volt of solar panel output. LM35 temperature sensor with sensitivity of 10 mV/��C is used to measure the ambient temperature of the solar panel.
The irradiance is sensed using LDR. The microcontroller serial interface is connected to an EGSR7150 modem in order Inhibitors,Modulators,Libraries to convert format data from serial to Ethernet data. Furthermore, Inhibitors,Modulators,Libraries the acquired data is also sent to the Drug_discovery access point of the connected user computer in the form of a Wi-Fi signal (IEEE 802.11 standard).A data transmission technology of ample expansion in the area of telemetry for remote regions is the GSM (Global System Mobile Communications) modem, using GPRS (General Package Radio Service). Currently, this technology is the most popular standard for mobile telephones around the world. GPRS application is a net connection for data package transmission. During a net connection, whereby the system is online, data is transfered immediately and the tariff is only made on the volume of data transmitted without considering the connection time.
As GPRS is compatible with the TCP/IP protocol, GSM operators supply a gateway to the Internet, making it possible to connect and to control wireless equipment in this way. In [10], t
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