DFRobot
DFRobot is a robotics and open source hardware provider that is dedicated to creating innovative, user-friendly products that foster a strong community of learning. It has a product catalog boasting over 1000 components and widgets including sensors, robotic platforms, communication modules and 3D printers.
DFRobot Product Index
RF Receivers
Interface - Modules
Float, Level Sensors
Robotics Kits
Adapters, Converters
Proximity Sensors
Latches, Locks