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0.1 F X25640
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1 2 3 4 CS S0 WP GND VCC HOLD SCK SI 8 7 6 5
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1 Basic Stamp P0
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Figure 3-4 Xicor X25640 8-kbyte EEPROM.
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K1EL IBM AT Keyboard to RS-232 Serial Converter
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The K1EL PS/2 keyboard encoder chip is shown in Fig. 3-5. This specially programmed, 8pin DIP package integrated circuit will allow you to connect up a full PS/2 keyboard to any of your STAMP 2 projects and is ideal for remote control. The keyboard encoder is an 8-pin microprocessor which requires only a few connections to produce a serial output which can be readily interface to a STAMP 2 microprocessor. Pin 1 is the Vcc input, while ground is applied to pin 8. The reset input at pin 2 is not used in our applications. The serial output is present from pin 3. The baud rate is set by pin 4; when this pin is set high, or at 5 V then 9600 , baud is selected. When the Baud pin is grounded, the output will be at 1200 baud. Pin 5 is the CLK pin, which connected directly to pin 1 of the PS/2 keyboard connector. The output sensing pin can be configured to either provide a high true marking output or a low true marking output. High true is the standard and in most cases would be used to connect directly to a microprocessor. Pin 6 sets the mode of operation. When pin 6 is high, then high true marking is selected, while grounding pin 6 allows the output to be low true marking. The DATA pin is fed directly from the PS/2 keyboard connector. Whenever the CTL, ALT, and DELETE keys are pressed at the same time, the Katbd will output a low true reset pulse on pin 2 of the encoder. The keyboard encoder is a great accessory chip for the STAMP 2 processor and will allow you construct many different types of remote control applications from robotics to model trains. All of the building block ICs are shown in their respective data sheets in App. 1.
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Our next building block IC is the 8-pin Sony IR decoder, which is a specially dedicated programmed microprocessor, shown in Fig. 3-6. The Sony IR decoder is from Cricket Robotics
SONY INFRARED DECODER CHIP 43
+5V .1 F N/C
4 1 2 VCC RSET TX BAUD GND DATA SEN CLK 8 5 7 6 5
Serial output
+5V Figure 3-5 K1EL PS/2 keyboard encoder.
+5V +5V U1 STAMP 2 P0 N/C N/C 0.1 F
8 7 6 5
U2 SONY IR DECODER
1 2 3
N/C N/C
1 2 3
GND VCC
Vout
LiteOn IR LTM-97DT-40
Figure 3-6 Sony IR decoder chip.
Inc. The Sony decoder IC takes a serial stream of bits from an IR receiver and converts the 12-bit frames of data to straight 8-bit ASCII. The data is converted in a continuous mode, which means the host processor must sync with the START bits of 2400-baud, 8-bit, no-parity frames being sent from a standard Sony IR remote. The Sony IR decoder chip is well suited to sending serial signals to a STAMP 2 processor. A Sony TV remote control outputs modulated infrared to communicate with a TV set. The IR receiver demodulates the IR signal and outputs a 12-bit serial word representing the key hit on the IR remote. The standard Sony IR signal outputs a 2-ms start bit. The Sony IR decoder IC watches for a valid START bit and then measures the high time of each bit of the 12-bit frame. The Sony IR decoder will decode each frame and then send the converted byte to the ASCII serial output pin 7. In operation, a LiteOn IR detector model LTM-97DT-40 is fed directly to the Sony IR decoder on pin 1. The Sony IR decoder is powered from a 5-V source at pin 8. The serial output of the Sony IR decoder is provided at pin 7, which can be readily interfaced to the BASIC STAMP 2. The key codes for the Sony IR decoder are shown in Table 3-1. A sample BASIC STAMP 2 application code is shown in the IR decoder demo program.
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