ms5611-i2c.py

#!/usr/bin/python

from Adafruit_I2C import Adafruit_I2C
from time import sleep

ms5611  = Adafruit_I2C(0x77,2) 

#reset
ms5611.writeList(0x1e,[])
sleep(2/1000.0)

#prom
t=ms5611.readList(0xa2,2)
c1=t[0]*256+t[1]
t=ms5611.readList(0xa4,2)
c2=t[0]*256+t[1]
t=ms5611.readList(0xa6,2)
c3=t[0]*256+t[1]
t=ms5611.readList(0xa8,2)
c4=t[0]*256+t[1]
t=ms5611.readList(0xaa,2)
c5=t[0]*256+t[1]
t=ms5611.readList(0xac,2)
c6=t[0]*256+t[1]

#c1=40127
#c2=36924
#c3=23317
#c4=23282
#c5=33464
#c6=28312

while True:
 ms5611.writeList(0x40,[])
 sleep(1/1000.0)
 adc=ms5611.readList(0x00,3)
 d1=adc[0]*65536+adc[1]*256+adc[2]
 #d1=9085466

 ms5611.writeList(0x50,[])
 sleep(1/1000.0)
 adc=ms5611.readList(0x00,3)
 d2=adc[0]*65536+adc[1]*256+adc[2]
 #d2=8569150

 dt = d2 - c5*(1<<8)
 temp=2000+ dt*c6/(1<<23)
 off= c2*(1<<16) + c4*dt/(1<<7)
 sens=c1*(1<<15) + c3*dt/(1<<8)
 p=(d1*sens/(1<<21) - off)/(1<<15)

 print c1,c2,c3,c4,c5,c6,d1,d2,dt,temp/100.0,off,sens,p/100.0