Weather station
Acording to JGW-T1809269, calibration factor from output voltage to each unit is given with
temp = ( Vout/78/0.001-100)/0.388 [deg_c] humd = (Vout/2)/5*100 [%] pressure = (Vout/2)/5*300 + 800 [hPa]
Then, "_GAIN" and "_OFFSET" parameters in cds filter of each channels are calculated by above equation with count value not voltage,
Name |
Value |
Unit |
_TEMP_OFFSET |
-1.278e4 |
count |
_HUMD_OFFSET |
0.0 |
count |
_PRES_OFFSET |
4.369e4 |
count |
_TEMP_GAIN |
2.017e-2 |
deg_c/count |
_HUMD_GAIN |
6.104e-3 |
%/count |
_PRES_GAIN |
1.831e-2 |
hPa/count |
,where ransformation coefficient from voltage to adc count is given with c2V = 2.0 * 10/2**15 [V/count], because output signal from sensor is measured with single-end not differential. These parameters are managed by SDF with observe.snap. So, plase do not change this file.