A Global Positioning System or GPS is a technological innovation that uses a number of satellites in the earth’s orbit, to transmit signals back to earth enabling GPS receivers to calculate and identify the exact location, time information and speed to the user. The GPS receivers can be able to pinpoint the person’s location at anytime using signals from either three or more satellites. Originally, the GPS was created by the US Department of Defense to be used for military purposes. Though the system started being used in the 1980’s it became available to public use in the 1990’s. The main advantage of the GPS is that it can be able to function even in all weather condition any time, day or night.

GPS receivers operate using clocks that are less accurate while the satellites use accurate atomic clocks. Because of this, there is a timing error when the GPS receiver gets the satellite signals. Since the signals arriving to the receiver from the three satellites are measured simultaneously, the distance measurements are falsified by the receiver’s clock error. Therefore, to accurately measure the position of the receiver, four unknowns are required namely; the three satellite coordinates and the receivers clock error. To solve the four unknowns at least four satellites are required. The use of four satellites allows the GPS to determine the location with a pinpoint accuracy. With the four satellites, the receiver can now be able to calculate accurate estimates of the receiver’s clock and its location. The functioning of the Global Positioning System may sound quite complicated but it is simple if followed keenly.

Bluetooth technology is a low cost short range radio transfer wireless communication technology which is getting immensely popular with passing days. Various portable fixed electronic devices like laptop, mobile, Bluetooth headset cars and digital cameras are examples of the implementation of Bluetooth technology in our daily life. Nowadays, the experts are trying to target the medical equipment to launch their Bluetooth modules there. The prices of all these modules are a bit expensive even today, but the way Bluetooth technology is progressing, it can come down a bit in future. The Bluetooth connections can be multipoint or point to point. It depends on the device and working environment.

You can use various Bluetooth devices to connect your desktop with your PC. There is a wireless rs232 port that signifies the logic level of 0, and -25 and signifies a logic level of 1. Sometimes it might happen that the communication does not happen properly because the translation between the microcontroller and the pc gets corrupted in between. To overcome this problem, you can use new CMOS to wireless rs232 converter. If you can establish the connection properly then you can utilize in various types of work and can access your pc from the microcontroller easily and comfortably.

If you want low range wireless connectivity Bluetooth communication is no doubt the best options for you. If you have Bluetooth serial adapter then you can use it almost in any device which has an USB port to connect with. If your old desktop does not have Bluetooth facilities then you can simply use this serial adapter in it to enjoy all the Bluetooth services from it. No charges will be deducted and that is what making Bluetooth modules popular among all. The range of Bluetooth rs232 is nearly 300 feet. If you go beyond that it will start malfunctioning. You can transmit voice messages and other data messages by using Bluetooth serial adapter at the same time.