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Figure 25-4 illustrates a preprogrammed keyboard chip from ham radio operator K1EL. (Type K1EL in you web browser.) This chip will allow you to use a standard IBM PS/2 keyboard to input controls to the STAMP 2 controller in order to locally control the Xlink system, if you do not wish to use the remote Internet feature. The 8-pin encoder chip is powered by 5 V. The keyboard is connected to ground and a 5-V source, as is the
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CONSTRUCTION OF THE BOARD 341
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chip. Pin 2 is a reset pin and is not used. Pin 3 is the output to the STAMP 2 controller. Pin 4 is the baud rate selector and is connected to 5 V for 9600-baud operation. Pin 6 is the mark/sense input and is programmed to ground. Pin 5 is connected to the keyboard CLK pin, and pin 7 of the Katkbd chip is connected to the data pin of the keyboard. Also note the output of the Katkbd could be connected to a mini RF link transmitter such as one of the Abacom models. A compatible RF receiver could then be connected to the input of the STAMP 2 controller serial input pin, for a wireless X10 system. To utilize local keyboard control of X10 devices, you will need to connect the output from pin 3 of the Katkbd chip to pin 25 (P15) of the STAMP 2 controller for local operation.
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The diagram in Fig. 25-5 highlights how to connect high-power output devices to the Xlink control system. As mentioned, the X-link system provides an output for external devices. Output pins 18 (P8) through 23 (P13) from the controller are connected through 1-k resistors to the base of the 2N3904 relay driver transistors. Relay 1 is a 5-V driver relay that can be used to turn on Sonalert or other small sounders or lamps. You can also use relay 1 to drive a second higher-current relay, which can be used to drive a large motor siren or strobe lamp, etc. The smaller 5-V relay at relay 1 is used to drive the larger-current 110-V relay 2. So, for low-current loads only one relay is needed, while higher-current loads must have two relays, to control motors, pumps, and heating and cooling devices.
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The X-link control system was fabricated on a 3- by 5-in double-sided circuit board, which houses the STAMP 2 microprocessor, the optional X-link server, and the glue, or support components (Fig. 25-6). A 5-V regulator, at U4, powers the STAMP 2, the mini web server, and associated support components. The 9-V zener is used for the a reference source for relay control.
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1 2 3 4
0.1 F
1 3 8 7 DATA 6 5 CLK 2 5
N/C 4 5V 5
3 DATA 2 GND ( ) 1 CLK
STAMP Pin (P25)
N/C 6
PS/2 connector
Figure 25-4 Keyboard controller.
342 X-LINK INTERNET CONTROL SYSTEM
9V Sonalert 5 9V Relay 1 N/O IN4001 N/C 5-V relay STAMP 2 I/O Pins 18 to 23 2N3904 1K Relay 2 N/O 110 Vac
110 Vac
Motor Lamp Siren Pump
Figure 25-5 Power relay circuit.
"Always on" broadband connection J4 LED Webserver module WSM U1 CPU U2
U3 LED J3 J2 J1 Power and outputs Figure 25-6 X-link block diagram. STAMP programming cable
Construction of the X-link PC board is quite straightforward. First, install all the IC sockets. Next you can install the resistors; be sure to observe the color codes on the resistors in order to correctly identify and install them in their proper locations. Next install the capacitors; be sure to observe the polarity marking on the capacitors. Locate the diodes and
SETTING UP AND OPERATING THE SYSTEM 343
the indicator LED. Be careful to identify the zener versus signal diodes and observe the correct polarity. Install the voltage regulator; once again be sure to observe the input versus output pins when installing this component on the board. Finally, install the header pins for the web-server module, the input pins, and power as well as programming connector J3 and server connection J4.
Setting up and Operating the System
Setup and operation of the X-link control system are quite straightforward. First, you will need to decide whether you will be using remote or local control. If you wish to use the Xlink for remote web control via the self-contained system web-server module (WSM) option, you must have an always-on Ethernet connection such as Road Runner Cable modem service or DSL, as a host for the X-link system board, at the control site that you wish to control. Next, you will need to connect your X-link board to a 9- to 12-V power supply or wall wart. Connect your programming cable between a PC or laptop and your X-link board; see Fig. 25-7. You will need to locate the STAMP 2 program titled XLink.BS2 (Listing 251), and load the program into the STAMP 2. Your always-on Ethernet connection is now plugged into the X-link board, at the RJ-45 jack. Once the controller is powered up and the Ethernet connection established, your X-link control system is ready for operation. To activate a particular device, simply press the number/letter for that device; to turn off a particular device, just press the number/letter for the device once again and the device will turn off. Note there is a reset switch for both STAMP 2 and the mini server module, in the event you encounter a system start-up problem. The diagram in Fig. 25-6 illustrates the mini web-server module installed on the main X-link system board. Plug the WSM module into the main X-link board. Note the proper orientation of the (WSM) module: the serial number in the top right corner faces the STAMP 2. In order for the X-link system to operate, the WSM or Siteplayer mini web server must be programmed with a control status monitor web page. Software for the web-server module is supplied in the X-link directory on the supplied CD-ROM. In order to install the Siteplayer or web-server module software, you will need to obtain the Siteplayer development board priced at $99.95. The Siteplayer development board and Siteplayer mini webserver module are available from http://www.siteplayer.com. Two other options are also available. You can purchase a WSM preprogrammed with the X-link software already installed for $45 from josh@petruzz.net, or you could have your own WSM module programmed for $15.45 plus $6.00 shipping. If you wish to purchase a Siteplayer module or have your Siteplayer module programmed without purchasing the development board, contact josh@petruzz.net. Next, you will need to figure out what types of outputs you wish to control. The status matrix is laid out from A0 to A5 followed by B0 to B5, then C0 to C5, D0 to D5, and E0 to E5, while the local (non-X10) controls are labeled F0 to F5. Letters A through E with numbers 0 through 5 were designed to represent X10 control devices, so you can control up to 30 X-10 devices. Letter F along with numbers 0 through 5 allow for local control of up to six devices or relay-controlled devices. The X-link monitor web page is shown in Table 25-1. The
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