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ASTRODAT USER S GUIDE 271
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Press Reset Switch or Power ON clear Memory_Full flag, LED OFF
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Key = Menu Yes Initialize the serial port an clear Memory_Full Flag, LED OFF go in User Menu Mode
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Must be Acquire Memory_Full flag is Set No Set Activity LED ON, start New Data Acquisition Set
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Acquire data and store data
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Exit from Menu Mode by the user
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Set Memory_Full Flag Blink Activity LED continuously
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No Set Activity LED OFF terminate current data set No Key = Acquire
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FIGURE 15.15 Flowchart for user interaction using the two keys: Acquire and Menu.
5) 6) 7) 8) 9)
iv) Stop bits 1 v) Communication rate 9600 vi) Parity OFF vii) Local echo ON Switch on the power supply to the system board. The Power ON LED should now glow. If it does not glow, either power supply connections are not connected properly, or the LED is faulty. Press the reset switch on the AstroDat system board. Press the menu switch on the board. A menu will appear on the screen with seven choices. Select any one choice by pressing the number corresponding to that choice. Any invalid number will be rejected and a new menu screen will appear. The choices are as follows: I) Initialize RTC 1) Press 1 to select this choice. 2) The valid values that can be entered and the format in which to enter them
272 AVR PROJECT 6: ASTRODAT: A STAND-ALONE DATA ACQUISITION SYSTEM
will be displayed. Data should be entered in the proper format and should have the correct values. 3) For example, if you wish to enter the following values: 3rd December, 1999, time is 15:01:23 and day is Friday, then enter data as follows: a) Enter 23 b) Press space bar c) Enter 01 d) Press space bar e) Enter 15 f) Press space bar g) Enter 03 h) Press space bar i) Enter 12 j) Press space bar k) Enter 05 l) Press space bar m) Enter 99 4) After the last value is entered, the main menu screen will appear. Note: Day is chosen such that Monday is day 01 and Sunday is day 07. Time is taken in 24-hour format. To enter 1, the user should enter 01. Single digits are invalid. II) Read RTC 1) Press 2 to select this choice. 2) The choice will display the current data in the RTC. 3) The format of each field in the data is displayed on the screen for interpretation. 4) To go back to the main menu user should press a key. III) Read EEPROM 1) Press 3 to select this choice. 2) The choice is used to read data stored in the EEPROM, in batches. 3) At a given time, a certain amount of the data stored in the EEPROM is displayed. To view another batch of data, the user should press a key. Once all the data stored in the EEPROM has been displayed, pressing of a key will display the main menu again. 4) Displaying the data in batches helps the user to interpret the data as it is displayed on the screen. Do not use this choice to store EEPROM data into a file. 5) Interpretation of the data stored is given afterwards. IV) Enter delay 1) Press 4 to select this choice. 2) The choice is used to allow the user to change the value of delay time between two observations in a set. The value of this delay is the same for all sets of data observations. 3) The delay value is calculated as follows: a) Divide the delay value required (in milliseconds) by 10. b) Convert the quotient obtained into hex. c) Enter the hex value obtained as the delay value. 4) After the delay value has been entered the main menu screen will appear.
ASTRODAT USER S GUIDE 273
Note: The delay value entered should be of four digits always. The minimum value that can be entered is 0002 and the maximum value that can be entered is FFFF. V) Read delay 1) Press 5 to select this choice. 2) The choice is used to display the current delay value stored in the system. Value is displayed in hex format. 3. Conversion of the value displayed is as follows: a) Convert the value displayed (in hex) to decimal. b) Multiply the decimal value by 10. c) The product obtained is the actual delay value in milliseconds. 4) User should press a key to return to the menu. V) Write to file 1) Press 6 to select this choice. 2) The choice is used to display the data stored in the EEPROM without any breakage. After the data is displayed, the user should press a key to return to the main menu. 3) The choice can be used to store EEPROM data into a file for further processing. Before selecting this choice, appropriate file store/transfer commands should be set up in VTERM. VII) Exit 1) Press 7 to select this choice. 2) The choice is used to exit from menu mode. On selecting this choice, the screen should go blank.
Acquiring data in the field The acquire switch is used to indicate the start and end of a set of observations. Pressing the acquire switch when the activity LED is off indicates the start of a set. The system now starts taking observations, and this is indicated by a glowing activity LED. The time delay between two data acquisitions in a set is programmed by the user, at the base using the menu switch. Pressing the acquire switch again will indicate the end of the set. The activity LED now switches off. The data thus recorded can be read back and analyzed at the base using the menu switch. The following steps should be followed for acquiring data in the field: 1) 2) 3) 4) 5) 6) 7) 8)
Connect the power supply to the appropriate pins on the system board. Connect the analog input signal to be stored to the data pin (J4). Switch on the power supply to the system board. The red LED should now glow. If it does not glow, either power supply connections are not connected properly, or the LED is faulty. Press the reset switch on the system board. Press the acquire switch to indicate the start of a set of observations. The activity LED now glows. Press the acquire switch whenever the data acquisition for the set has to be stopped. The activity LED will now switch off. Press the acquire switch whenever another set of observations has to be recorded.
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