The ADS1115 are precision analog-to-digital converters (ADCs) with 16 bits of resolution offered in an ultra-small, an MSOP-10 package.
Data are transferred via an I2C-compatible serial interface, four I2C slave addresses can be selected, it operate from a single power supply at 3.3V.
It can be used to detect analog signal and convert it to digital signal.
You can attach a joy stick or other analog sensor such as NTC,temperature, dust sensor and so on.
http://wiki.52pi.com/index.php/RPI-ADS1115-ADC-Module_SKU:EP-0076

Technical Details

Product Details

Product Dimensions

Package Dimensions
Width : 2.99 inch
Height : 0.51 inch
Length : 4.29 inch

Item Weight: 0.48 ounce (View shipping rates and policies)
Shipping Weight: 0.64 ounce (View shipping rates and policies)

ASIN : B01MQPSZ4W