barcode reader in asp.net FIGURE 15.8 Circuit schematic for the AstroDat Data Acquisition System. in Software

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FIGURE 15.8 Circuit schematic for the AstroDat Data Acquisition System.
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DESIGN DESCRIPTION 265
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FIGURE 15.9 Signals illustrate the AVR processor controlling the MAX186 ADC.
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FIGURE 15.10 Signals illustrate the AVR processor controlling the Dallas DS1302 RTC.
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266 AVR PROJECT 6: ASTRODAT: A STAND-ALONE DATA ACQUISITION SYSTEM
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FIGURE 15.11 Signals illustrate the AVR processor controlling the Atmel AT24C512 EEPROM.
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After the user exits the user menu, the user can either press the Menu key again or press the Acquire key. If the Acquire key is pressed, the system starts data acquisition and the Activity LED is put ON, and during this period (when the Activity LED is ON), the Menu key is ignored. The ADC is an 8-channel, 12-bit sampling ADC from Maxim. We have used the ADC in a single ended, bipolar mode. The ADC has a four-wire serial format link. The processor sends control data on the Din signal of the ADC, and the ADC converts analog voltage on its input, as selected by the control data, and sends the result back to the processor on the Dout signal line. The data is clocked on the serial clock signal SCLK generated by the processor. After the conversion, the chip select signal CS* of the ADC is deactivated to reduce power consumption by the ADC. This signal is activated again by the processor before the start of the next conversion. The signal transitions for the ADC as captured from a logic analyzer are illustrated in Figure 15.9. The RTC, which is a DS1302 part from Dallas, is operated in a burst mode of operation, and all the date time information is read out. The program tags this information (year, month, date, day, hour, minutes, and seconds) at the start of each data set after the start tag. The user can program the RTC in the Menu mode and set the time as well as read the time for verification. The RTC uses an independent 32768-Hz crystal. I have also provided a small 3.6-V Lithium battery for backup power supply. The RTC thus keeps time even if the system is powered off. Figure 15.10 illustrates the logic analyzer traces for the three signals between the processor and the RTC. All communication starts with the RST signal going high. The control byte is transmitted first by the processor. The data for the control byte is sent on the I/O signal and is clocked into the RTC at the rising edge of the Sclk signal. The data format is LSB first and MSB last. Data from the RTC is clocked out at the falling edge of the Sclk.
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SYSTEM DEVELOPMENT 267
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15.8 System Development
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This system was developed using the proto board described in another chapter. However, even the STK200 evaluation board can be used equally easily. To begin with, small programs dealing with each section of the hardware were developed and tested. Small PCBs were used to build the ADC section, the RTC section, and the EEPROM section, and independently tested. The Timer interrupt was also tested on the proto board for different delay multipliers. Once each of these peripheral devices was tested, they were integrated onto a single PCB and a complete program with all the developed routines was created. It was tested till it started working correctly. One of the pitfalls in writing to an EEPROM is the write access time. I used the worstcase maximum time of 10 ms as specified in the data sheet. To write more than one byte in the EEPROM, I used the page write mode so that it still takes the write access time of 10 ms maximum to write two bytes. However, if the two bytes are written independently, it will take 20 ms to write, which I avoided by using the page mode of writing. Eventually the system was connected to a function generator, and multiple data sets were recorded by pressing the Acquire key. After the data recording was completed, the system was connected back to the PC serial port, the system was put in Menu mode, and the data was downloaded into a file using the Write to File function. Then the data was interpreted manually and plotted on a graph sheet to compare with the waveform generated by the function generator. The comparison was positive, and this completed the system development. Subsequently, a C program was written to automate the data interpretation and reduction step, and now we can get the plot of the data automatically, as illustrated in Figure 15.12.
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2.5 "file3" 2 1.5 1 0.5 Volts (V) 0 -0.5 -1 -1.5 -2 -2.5 0 500 1000 1500 Time (ms) 2000 2500 3000 Sinewave generated by a function generator and recorded by the AstroDat system
FIGURE 15.12 Sample data plot of a sinewave generated by a function generator and recorded by the AstroDat System. The X axis is time in ms and the Y axis is volts.
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