Hardware Reference
In-Depth Information
voltage output from 0.2 to 4.8 V. The small outline package of this device has eight pins. Among
these eight pins, only three pins carry useful signals:
Pin 2.
V
S
Pin 3. GND
Pin 4.
V
OUT
This pressure sensor is often used in aviation altimeters, industrial controls, engine con-
trol, and weather stations and weather reporting devices.
Connect an MPX4115AC6U (or MPX4115A6U, case 482) device to your HCS12 demo board
to measure the current ambient barometric pressure once every second and display the pressure
on the LCD display. The data sheet of the MPX4115A can be found on the complementary CD.
Since the barometric pressure is in a narrow range (use the range mentioned in Example 12.11),
you may need to construct a signal-conditioning circuit to translate and scale the voltage out-
put of the pressure sensor to the range of 0 to 5 V.
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