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Circuit to determine the humidity is a comparator, which detects the temperature change is very small in relation to the ambient temperature environment.

Circuit electronics to determine the humidity of the room

Circuit electronics to determine the humidity of the room

Parts:

R1_____________22K Linear Potentiometer (See Notes)
R2_____________15K @ 20°C n.t.c. Thermistor (See Notes)
R3_____________10K 1/4W Resistor
R4,R5,R7,R9____22K 1/4W Resistors
R6____________220K 1/4W Resistor
R8______________5K 1/2W Trimmer Cermet
R10___________680R 1/4W Resistor

C1_____________47µF 63V Electrolytic Capacitor

D1_____________5mm. Red LED
D2_____________5mm. Green LED

IC1___________TL061 Low current BIFET Op-Amp
IC2___________LM393 Dual Voltage Comparator IC

P1_____________SPST Pushbutton

B1_______________9V PP3 Battery