http://forum.arduino.cc/index.php?topic=272402.msg1923962#new

TODO's
- none
DHT11 blauwe testen ....

DONE
======================
- there are many delay()'s still in the library and these should be removed if possible or at least minimized.
- the PRE1.0 Arduino support needs still to be implemented. Or removed completely.
- test test test test test and ....

Remark Erni
============
int64_t offset = (unsigned long)C[2] * 65536L + (C[4] * dT ) / 128L;


OPtimiize
============
  uint16_t C[8] = { 80, 53513, 56427, 32594, 31335, 31612, 27894, 45785};
  uint32_t D1 = 7909856L;
  uint32_t D2 = 8246240L;
  
  
  int32_t dT = D2 - C[5] * 256L;
  int32_t temp = 2000 + (dT * C[6])/8388608L;

  int64_t offset = C[2] * 65536L+ (C[4] * dT ) / 128L;
  int64_t sens = C[1] * 32768L + (C[3] * dT ) / 256L;
  int32_t P = ((D1 * sens)/2097152L - offset) / 32768L;
  
  
  Port open
MS5611 test version: 0.0.00
reset:	0
0	50	80
0	D109	53513
0	DC6B	56427
0	7F52	32594
0	7A67	31335
0	7B7C	31612
0	6CF6	27894
0	B2D9	45785
convD1:	0
7909856
convD2:	0
8246240


float is 40% faster 168 versus 296 == 130 uSec.
test sketch size, RAM
int64 => 7220, 476
float => 6522, 476

==> scheelt 700 bytes.


  dT = D2 - C[5] * 256L;
  int16_t T2 = 2000 + (dT * C[6]) /8388608L;

  float offset2 = C[2] * 65536.0 + (C[4] * dT ) / 128.0;
  float sens2 = C[1] * 32768.0 + (C[3] * dT ) / 256.0;
  uint32_t P2 = ((D1 * sens2)/2097152.0 - offset2) / 32768.0;
  

Start 
296
153568
1999
89177

168
153568
1999
89177