Le 30/06/2015 23:10, Anton Lundin a écrit :

On 30 June, 2015 - Stan wrote:

...

Hi,

Does anybody know how to configure lidivecomputer in order to get depth in fresh water. (Assuming it calibrated for salted water). For the Reefnet Sensus Ultra, I get the raw pressure and then I compute the depth.

I guess there is something to change in units.h ?

Looking at the code, you can adjust the calibration values you're self by calling:

reefnet_sensusultra_parser_set_calibration(dc_parser_t *abstract, double atmospheric, double hydrostatic)

The defaults are: #define ATM 101325.0 #define GRAVITY 9.80665

parser->atmospheric = ATM; parser->hydrostatic = 1025.0 * GRAVITY;

And the depth returned is computed by:

#define BAR 100000.0

sample.depth = (depth * BAR / 1000.0 - parser->atmospheric) / parser->hydrostatic;

So, in my tired mind, something like: reefnet_sensusultra_parser_set_calibration(parser, ATM, 1000.0 * GRAVITY);

Should give you your depth for fresh water.

//Anton

Assuming the density of the salted water to be 1.025g/l (compares to density ==1g/l for fresh water), that should work ! Thanks again Anton.

Stanislas