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BaromCal, ver 0.3, July 2005, John Bennett, N4XI Utility for calbrating the 1-Wire barometer. 1-Wire Net port required on command line: baromcal /dev/ttyS0 To adjust offset: baromcal /dev/ttyS0 --offset Write down the serial number printed above. If you have more than one DS2438 device on the one-wire bus, each will have to be identified. Note that several devices use the DS2438. The serial numbers must then be entered when called for in the T-238 setup or entered into with the appropriate parameter if using the wxn server suite. Press any key when ready to continue... ----------------------------------------------------------------------------- Calibration preliminaries (if you have not already done so): 1. Fill the vinyl hose with about 50" of water. 2. Holding the top ends of the tube even, tap the tubing to get all the air bubbles out. 3. Clamp the tubes in the upper clamps so that one end of the tubing is long enough to reach the port on the MPX4115 sensor. 4. Adjust the tubes in the 40" bracket so that the water level in both tubes is even with the top of the clamps at the upper level. 5. Very carefully, push a free end of the vinyl tubing on the port of the MPX4115. Be careful to keep the sensor assembly above the top level of the water in the vinyl tubing. Press any key when these steps have been completed and you are ready to begin. Initial Offset Adjustment: 1. Move the jumper at P14 so that Vad-Cal is jumped. 2. In the following, you will adjust the offset (RH pot) so that the reading is as close as possible to 331. When you have achieved this, press any key to exit the loop. 3. Press any key to begin... ----------------------------------------------------------------------------- Change the input to the operation mode by moving the jumper at P14 so that Vad-Op is jumped. In the following, when instructed to move the tubing from one clip to the other, both tubes must be adjusted so that the level in both is aligned with with the top end of the clips. Double-check both and be certain they are in correct alignment before taking a reading. Press any key to continue... In the following, the OFFSET (RH pot) will be adjusted to give the correct barometric pressure reading for your altitude. 1. Move both tubes back to the top of the calibration fixture. 2. CAREFULLY remove the vinyl tubing from the pressure transducer by gently twisting and pulling the tubing at the same time. After entering the current pressure, adjust the offset (RH pot) until the difference is zero (do NOT press any keys during this adjustment). When the difference is zero, press any key to exit. Calibration is now complete. Any minor corrections for drift or changes in altitude can be effected by adjusting the offset on the interface board. If you are using the wxn server suite, you may also make the adjustment by changing the parameter in . The value of the offset is added to the reading. Negative numbers are legal. Any major changes in elevation will most likely require running this calibration program at the new location with the offset option. /help--help/?Failed to acquire port <%s>. Disconnect all one-wire devices using the DS2480 except for the barometer and restart No DS2480 devices found. Connect barometer and restart. Barometer one-wire serial number: --offset/offsetUnknown option <%s> Offset: %4i------------------------------- Upper reading: %i Move the tubing in the clip FARTHEST from the sensor to the lower clip. Press any key to take the lower reading... Lower reading: %i Diff(Target): %i(398), Off by: %i Increase gain (CW, LH pot) Decrease gain (CCW, LH pot) High/low positions interchanged! Clip tubing in the high position and press any key when ready. Gain is correct! Choose the 'N' option for the next step. Move the tubing back to the top clip. Any other key to continue, 'N' to exit loop, 'Q' to quit program Enter the current barometric pressure (InHg, e.g., 29.93): Difference: %4iI&@@0@@e@3=K  0h   oІoo6FVfvƈֈ&6FVfvƉ։ Gdx%6J]u@j@`@@ ` ` ` `@@ `@@@ ` ` ` `^a?݃œ~ A!@_>`#}B]I@Y @o`z@(^ "/; E Q\epԐ < E F8 @@ L "|" /X FYP jx1  = 9 8  |}  q` ( #+= L8U bsB N7 ж ĢG $ j R )z>* OJ0 a  n(  @ , H ƠU |$  R  +@2@DDV# gk {ڞ 6  g    (`<   -* < ` F  Y + n (@ ~ %  < `0 ]  XH @ Ύ  P    $ : : W  i z X#     9 0 @@ ( J $ Ƴ @   6 & Χi 3 :K _  l ||  5 6   @ T  " ' O 7 HH dE [ d   s  ~1 . 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