CONSTRUCTION DETAILS
Since the MPXY80xx family sensors perform absolute pressure measurements, the sensor itself must be physically separated and enclosed in a hermetic chamber, which is pressurized during measurement. Current atmospheric pressure needs to be subtracted in software from the tire pressure indicated by the sensor to display correct differential tire pressure.
Mechanical construction of the first prototype is shown under figure.
The sensor, with its power supply decoupling capacitor, is placed on a separate PCB. Connection between the main board and the sensor PCB is achieved by a miniature connector pair. This enables easy sensor PCB extraction and replacement in the prototype system. The main PCB is secured in the enclosure by a single M3 screw, while the
sensor PCB is held in position only by the connector friction.
Prototype PCBs
Actual width of the main PCB is approximately 38mm
A photograph of the assembled gauge is shown under :
