MPR121: The MPR121 is a capacitive touch sensor controller, features internal intelligence, include a hardware configurable I2C address, an expended filtering system with debounce , and completely independent electrodes with auto-configuration built in.
Touch Sensor feeler: The Touch Sensor feelers, which was 4 included in Touch Sensor module, can be set in any place you like, to feel your finger's touch or proximity. Notice it must not get in touch with any conductive material.
For all Grove users (especially beginners), we provide you guidance PDF documents. Please download and read through Preface - Getting Started and Introduction to Grove before your using of the product.
Please visit our wiki page for more info about this product. It will be appreciated if you can help us improve the documents, add more demo code or tutorials. For technical support, please post your questions to our forum.