.net core qr code reader

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Often it is necessary to use a microprocessor to control a relay. In order to have the STAMP 2 control a relay, a transistor driver must be used. In the next example, shown in Fig. 2-11, pin P0 is used to drive a 2N2222 npn transistor, which in turn is used to control the relay. Although some mechanical relays may draw a low enough current to control a relay directly, this is not recommended. When the electromagnetic field of a relay collapses, a voltage spike is generated. This spike can damage MOS-type circuits found in microprocessors. In this circuit a high signal on P0 causes the transistor to conduct and sink the relay to ground. The magnetic field energizes, and relay contacts close. Upon deactivation, the relay coil generates a reverse voltage spike. This voltage spike is shorted out or snubbed by the diode across the relay coil. Also note that if you want to control very large currents, then a low-current relay could be used to drive a high-current relay. The STAMP 2 can be used to control a dc motor as shown in Fig. 2-12. In this circuit, a high at pin P0 drives the IRF511 MOSFET device, which in turn operates the dc motor. A diode is placed across the MOSFET when the motor field changes, thus protecting the MOSFET and the STAMP 2. Note that you will have to scale your motor and its current requirement with the MOSFET used in your particular application.

When receiving a digital signal such as pulse code modulation (PCM), a digital-to-analog (D/A) converter is used. This reverses the process of A/D conversion at the transmitter, so that the original analog data is recovered.

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If instead you elected to use your own PC server instead of the on-board mini web-server module on the Weblink monitor board to send e-mail notification, you will need to supply your own always-running computer, which will act as your server. This configuration also requires an always-on Ethernet connection in order to send e-mail or FTP notifications to your remote monitoring computer, cell phone, or alpha pager. You will need to make up serial connection cable from the output of the Weblink controller board to your always-on server PC via header J4. Figure 24-8 depicts the Weblink-to-PC server connections. Sensors as well as power are connected on the bottom of the circuit board at J1. Connector J2 is provided for a sensor daughter board. Once your serial port cable is connected between the Weblink monitor board and your PC server, you will need to power up the Weblink board and load the EMDAT1.BS2 into your STAMP 2 controller, for alarm email notification. Note that the program contains a sample e-mail address, which will have to be changed to your own e-mail address. Next you will need to install the mini server program WEBSERV .EXE into your always-running PC, and configure it for e-mail files. Your Weblink monitoring system is now ready to serve you.

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510 Data reception You might ask, Why convert a signal to digital form in the first place, if it s going to be changed back to analog form at the receiver anyway The reason is that a digital signal is inherently simpler than an analog signal, in the sense that is less random Thus, a digital signal resembles noise less than an analog signal It s good to make a signal as different from noise as possible, in as many ways (or senses) as possible This is because the more different a signal is from unwanted noise, the easier it is to separate the data from the noise, and the better is the realizable S/N ratio You might think of signal/noise separation in terms of apples, oranges, and a watermelon It takes awhile to find an orange in a tub of apples (You ll probably have to dump the tub).

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