AT89S51-based MCU and HS1101 do detect relative humidity. Needed can be downloaded reference.

Fre_89S51led
............\Backup Of fre89s51.DBK
............\fre89s51
............\fre89s51.c
............\fre89s51.hex
............\fre89s51.lnp
............\fre89s51.LST
............\fre89s51.M51
............\fre89s51.OBJ
............\fre89s51.Opt
............\fre89s51.plg
............\fre89s51.Uv2
............\fre89s51_Opt.Bak
............\hs_ne555p.c
............\hs_ne555p.LST
............\hs_ne555p.OBJ
............\Last Loaded Frequence.DBK
............\leddiplay.c
............\leddiplay.LST
............\leddiplay.OBJ
............\STARTUP.A51
............\STARTUP.lst
............\STARTUP.obj
............\types.h

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