Wifi gateway (one per house) price (usd) URL note wemos 5.76 https://wiki.wemos.cc/products:d1:d1_mini Decent transciever 5.12 http://www.dx.com/p/nrf24l01-pa-lna-wireless-module-w-antenna-black-3-0-3-6v-222913 WhareHaurora gateway shield 5 https://github.com/WhareHauora/wharehauora-pcb/blob/master/Whare%20Hauora%20Wemos%20r1.zip print from oshpark total 15.879999999999999 First sensor (one per room) price (usd) URL note SenseBender 18.21 https://www.openhardware.io/view/1/Sensebender-Micro Transciever 4.26 http://www.dx.com/p/nrf24l01-2-4ghz-enhanced-wireless-modules-black-4-pcs-403021#.WToEFR8xBhE comes in pack of 4 AA battery holder 1.48 http://www.dx.com/p/diy-3v-2-slot-2-x-aa-battery-double-deck-back-to-back-holder-case-box-with-leads-black-322314#.WToEOh8xBhE total 23.95 3 more sensors (one per room) price (usd) URL note SenseBender 18.21 https://www.openhardware.io/view/1/Sensebender-Micro AA battery holder 1.48 http://www.dx.com/p/diy-3v-2-slot-2-x-aa-battery-double-deck-back-to-back-holder-case-box-with-leads-black-322314#.WToEOh8xBhE total 19.69
