Building prototype from schematic to test that all the additional connections are possible and that the system can be made to work before sending the BRD file off for PCB fabrication.
To calibrate humidity sensor I am going to use a salt bath made from the anhydrous form of the salts below.
Copper Sulphate CuS04 0% RH
Magnesium Chloride (MgCl2) 33.3% RH
Sodium Chloride NaCl (Salt) 75.6% RH
See here
Hey man,
you might want to check the temperature range that humidity sensor works at, especially if you’re heading down to -60C. Great project. Email me if you have any questions…
Cheers,
PermalinkDave