AN1950

Sensors

22

Freescale Semiconductor

pula

;we are done

bclr 4,porta

;so

bclr 5,porta

;turn off LEDs

rts

iscmd: bsr lcdcmdo

bra reuse1

;-------- ROM DATA: contains all LCD messages -----------------------

msg01

db

$01,$80,'*MPAK & 908QT4* '

db

$C0,'Reference Design','@'

msg01a db

$01,$80,'Water Level & '

db

$C0,'Flow

v2.0','@'

msg01b db

$01,$80,'1:Level/Flow '

db

$C0,'2:Set Units

','@'

msg05

db

$01,$80,'* Calibration! *'

db

$C0,'Curr lo/hi:','@'

msg05a db

$01,$80,'1st point: 0mm'

db

$C0,'SEL:cal ENT:quit','@'

msg05b db

$01,$80,'Calibrating... '

db

$C0,' 0mm: ','@'

msg05c db

$01,$80,'2nd point: 160mm'

db

$C0,'ENT:continue ','@'

msg05d db

$01,$80,'Calibrating... '

db

$C0,' 160mm: ','@'

msg05e db

$01,$80,'INVALID

'

db

$C0,'CALIBRATION! ','@'

msg02a db

$C8,' EMPTY','@'

msg02b db

$C8,' FULL','@'

msg02c db

$C8,' steady','@'

msg02d db

$C8,' H20 in','@'

msg02e db

$C8,' H20 out','@'

msg03

db

$01,$80,'1: unit=cm H20 '

db

$C0,'2: unit=in H20 ','@'

msg03a db

$80,'Unit is now: cm','@'

msg03b db

$80,'Unit is now: in','@'

menupos db

$80,$C0

end

REFERENCES

Baum, Jeff, “Frequency Output Conversion for MPX2000

Series Pressure Sensors,” Application Note AN1316/D.

Hamelain, JC, “Liquid Level Control Using a Pressure

Sensor,” Application Note AN1516/D.