barcode reader using c#.net Copyright 2001 The McGraw-Hill Companies, Inc. Click Here for Terms of Use. in Software

Generation Code 128B in Software Copyright 2001 The McGraw-Hill Companies, Inc. Click Here for Terms of Use.

Copyright 2001 The McGraw-Hill Companies, Inc. Click Here for Terms of Use.
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318 IDEAS FOR PROJECTS
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0 OK AT90S2343
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FIGURE 20.1 Code authenticator.
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20.2 A CCD Camera Controller
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CCD cameras have become extremely popular. You can use the AVR controller to build a CCD camera yourself. Figure 20.2 illustrates the block diagram for a CCD camera, and Figure 20.3 illustrates how the CCD Camera connects to the PC. You could choose one of the many communication links we outlined in a previous chapter. Some popular CCD chip manufacturers include Texas Instruments and Kodak.
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20.3 Personal Temperature Logger
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This little project offers you the ability to record your body temperature using a minimal possible system using just two 8-pin ICs, a controller, and a temperature sensor! The controller could be the tiny 8-pin AT90S2343. The temperature sensor is LM75 from National Semiconductor. The circuit is so small that it can be worn as a locket around the neck, and the temperature probe can be stuck somewhere on the body using an unmedicated BandAid sticker. Neat, isn t it (Figure 20.4) The temperature logger features:
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1. 0.5 degree C temperature resolution. 2. Temperature range: 25 C to 100 C. 3. 128 data points nonvolatile storage.
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PERSONAL TEMPERATURE LOGGER 319
CCD Chip Vertical Shift Clocks Charge o/p Horizontal Shift Clocks Clock Driver Waveform Generator To Host PC From Host PC Signal Conditioner & Pre-amp Signal Digitizer (ADC) Image Data
Commands
Bias Voltage
Embedded Processor
AVR Processor
FIGURE 20.2 Block diagram of a CCD camera controller.
CCD Head
Image Acquisition and Parameter CCD Controller Communication
Host Computer
Communication link
FIGURE 20.3 CCD camera connectivity to the PC.
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AT90S2343 TxD
LM75 SCL
Gnd RST
RST SDA
Mode
FIGURE 20.4 A personal temperature logger.
4. Selectable record rates: 15 min, 1 hr, and 3 hr. 5. Estimated active current consumption (during sampling): 2 mA. During sleep mode,
this falls to less than 1 mA.
6. Operational voltage: 3 V (2
1.5-V cells).
CONFIGURING THE TEMPERATURE LOGGER
The two mode switches have four possible settings: speed1, speed2, speed3, or readout. Set the two mode switches to select the appropriate record speed (speed1, speed2, or speed3), press the reset button and let go. The circuit starts logging temperature.
Extracting Data
To read out the data, set the two mode switches to readout mode (both switches OFF), connect the logger to the PC serial port, and press the reset switch. The data logger dumps the data to the PC at 2400 baud, 8N1. A suitable terminal emulator program can save the data to a file for analysis or viewing.
20.4 Swipe Card Reader
A Swipe card contains bar-coded information as seen on many products. I propose to use an IR LED and detector to scan a bar-coded swipe card using AT90S1200 controller. The controller reads the swipe card and dumps the code onto a LCD display, a serial port, or it could be used to activate some valve/relay, etc. The swipe card idea is illustrated in Figure 20.5.
A MORSE CODE TUTOR 321
Swipe Card
IR LED
IR Detector
LCD Display
AVR Controller
FIGURE 20.5 A swipe card reader.
20.5 IBM PC Keyboard Decoder
It is sometimes desirable to interface a PC/AT keyboard to a microcontroller for some applications. This project illustrates how to achieve just that. The diagram in Figure 20.6 illustrates the idea. The keyboard is connected to the AT90S2313 controller through connector J1. Only two lines are required: for the clock and data signals of the keyboard. These lines are bidirectional. During normal operation, the keyboard drives the clock and data lines; however, the controller can also take control of these lines to send commands to the keyboard.
20.6 A Morse Code Tutor
Connect an LCD display to an AVR controller, add a few switches and a speaker and you are ready to build this Morse code tutor illustrated in Figure 20.7. A partially completed circuit board is illustrated in Figure 20.8.
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AT90S2313 J1 PB0 Clock PB1 PB2 PB3 PB4 PB5 PB6 PB7 PD3 Data PC Keyboard 4 MHz Connector PD2 Gnd 4 2 5 1 3 +5V
22 pF 22 pF Strobe
FIGURE 20.6 A PC keyboard interface to the AT90S2313.
16 Character x 2 Line LCD
4-bit +5V Data
Set Speed
AT90S2313
Piezo Speaker
S3 S1: Select S2: Scroll S3: Escape
FIGURE 20.7 A Morse code tutor.
A MORSE CODE TUTOR 323
FIGURE 20.8 Photograph of the Morse tutor circuit board.
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GLOSSARY
ADC: Acronym for Analog to Digital Converter. An electronic device or system that encodes analog voltage/current to a multilevel digital number. address bus: A group of signals in a microprocessor system that indicates the address of the memory location from where the data is to be read or written to. ASCII: American Standards Committee for Information Interchange. A 7-bit coding scheme for alphabets, numerals, punctuation, as well as control characters. ASIC: Acronym for Application Specific Integrated Circuit. assembler: A software program that takes a text file called the source file, and converts it into another file with the machine op-codes (simply called the machine code or object code). BCD: Acronym for Binary Coded Decimal. BOD: Brownout Detector. An electronic device that detects a drop in supply voltage below a threshold and generates a signal to reset the processor till the supply voltage is restored to acceptable level. BIT: Binary digit. bps: Acronym for Bits per Second. byte: A number with a maximum of eight bits. Thus the byte-wide number is between 0 and 255 (decimal). CISC: Acronym for Complex Instruction Set Computer. This a type of processor architecture that is characterized by a variable instruction length, usually small numbers of register and multiple address modes.
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