====== Barometric Pressure sensor ======

====== Dual pressure sensor board ======
{{:projects:electronics:dualpressuresensor:pressure_sensor.jpg?600|}}

{{:projects:electronics:dualpressuresensor:dualpressuresensorboard.jpg?100|}}
{{:projects:electronics:pressure_sensor_board.jpg?100|}}


{{:projects:electronics:datasheets:pic18f1320.pdf|PIC18F1320 Datasheet}}



RX on pin 3
TX on pin 2

<code>
Power ON
98.97 kPa,      742.3 Torr      ; 0814,0521
98.97 kPa,      742.3 Torr      ; 0814,0521
98.97 kPa,      742.3 Torr      ; 0814,0521
</code>

===== Reference =====
==== Barometer - MPXAZ4115A ====
{{:projects:electronics:dualpressuresensor:mpxaz4115a_function.gif?300|}}

{{:projects:electronics:dualpressuresensor:mpxaz4115a.pdf|}}

==== Pitot - MPX5010DP ====
{{:projects:electronics:dualpressuresensor:mpx5010_function.gif?300|}}
{{:projects:electronics:dualpressuresensor:mpx5010.pdf|}}

==== MAX3227 ====
I need to order the 296-19829-1-ND
{{:projects:electronics:dualpressuresensor:max3227e.pdf|MAX3227E Datasheet}}

MAX3221 is the wrong chip, it only does +-5V 232 signals, I will need to remove and add the MAX3227

{{:projects:electronics:dualpressuresensor:max3221.gif?200|}}

{{:projects:electronics:dualpressuresensor:max3221-max3243.pdf|}}


==== MAX233CPP Breakout board ====
^Wire^Function^
|Red|5V|
|Yellow|RX (Data from computer)|
|Blue|TX (Data to computer)|
|Black|Gnd|
==== Calculations ====

http://www.chrisgood.com/uav/avionics/airspeed_slide0024.htm

----

===== Op-Amp Circuit =====
  * Use an LM358 Op-Amp
  * 80 to 110 kilopascals >> 3.125 to 4.475 Volts. 3 to 4.5 volt rate will give 77.3 to 110 KPa range.

{{:projects:electronics:dualpressuresensor:diff_graph.png|}}

{{tag>[PIC Barometer project pressure sensing microcontroller]}}