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AN1979 Datasheet(PDF) 7 Page - Freescale Semiconductor, Inc |
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AN1979 Datasheet(HTML) 7 Page - Freescale Semiconductor, Inc |
7 / 10 page AN1979 Sensors 7 Freescale Semiconductor air, the rising air will cool, the air will condense forming clouds and precipitation in the form of rain or snow. This reference design saves the current pressure reading and compares it to past pressure measurements. It determines if there was a pressure drop or a pressure increase. Using this information, it makes a simple weather prediction by sending a message of ‘sunny’ for a pressure increase, ‘rainy for a pressure drop, and ‘steady’ for no significant change in pressure.1 CONCLUSION The Altimeter is one of many applications for the MPXM2102AS pressure sensor. This reference design can be used as a reference for developing more integrated barometer applications such as hand-held weather stations, altimeter features for camera or GPS systems, as well as barometric pressure monitoring systems for industrial systems. The MPXM2102AS is an excellent pressure sensor for this application since it is calibrated and temperature compensated. By having these features available on-chip, there is a large savings in PCB real estate in addition to savings in cost for external components . 1. This information was found from the USA Today Weather Book from USAToday.com. Table 4. Elevation Pressure and Temperature Changes Altitude Above Sea Level Temperature Barometer Atmospheric Pressure Feet Meters F C mm * Hg psi kPa -1000 -305 63 17 787.9 15.23 105.0 -500 -153 61 16 773.9 14.96 103.1 0 0 59 15 760.0 14.69 101.33 500 153 57 14 746.3 14.43 99.49 1000 305 55 13 733.0 14.16 97.63 1500 458 54 12 719.6 13.91 95.91 2000 610 52 11 706.6 13.66 94.19 2500 763 50 10 693.9 13.41 92.46 3000 915 48 9 681.2 13.17 90.81 3500 1068 47 8 668.8 12.93 89.15 4000 1220 45 7 656.3 12.69 87.49 4500 1373 43 6 644.4 12.46 85.91 5000 1526 41 5 632.5 12.23 84.33 6000 1831 38 3 609.3 11.78 81.22 7000 2136 34 1 586.7 11.34 78.19 9000 2441 31 -1 564.6 10.91 75.22 9000 2746 27 -3 543.3 10.5 72.40 10,000 3050 23 -5 522.7 10.1 69.64 15,000 4577 6 -14 429.0 8.29 57.16 |
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