Which humidity sensor should I use?

the project have working on year finding maintainable alternative double glazed units.

so have come with?

simply put, take conventional single glazed window, add opening window (similar secondary glazing) sealed former , maintain correct humidity between "windows" circulating air within cavity through desiccant. , works, i've made 32 windows , work well.

at moment i've got pumps running on timer. plan insert humidity sensors in cavity , arduino controller switch pumps. when humidity in cavity reaches threshold pump runs few minutes. resample after few more minutes , pump again or ignore etc. 8 windows in house (each 4 panes). cable run sensor controller, 10m.

my next job fix humidity sensors....but 1 think should use?

any advice appreciated

thanks

ron

drawing attached

you can make use of honeywell's humidicontm digital humidity/temperature sensors (hih6130/6131 , hih6120/6121 series. small , has high sensitivity. , arduino library readily available make use of.

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