1234
VDDSDAGNDSCL

1.8-3.6v, no pull-up resistors on the module

Official Datasheet (CN): AHT15规格书v1_1(最新).pdf

Unofficial Datasheet (EN): Aosong_AHT15_en_draft_0.pdf

Site: http://www.aosong.com/en/products-45.html

Price 3.5$


Sensors test examples: 

Test 4 v6 Saturated NaCl solution

Test 2 v7 room RH12 low humidity

Test 1 v8b Balcony high to mid RH

Test 0 v9 balcony high humidity