The SparkFun Distance Sensor Breakout utilizes the RFD77402 3D ToF (Time of Flight) sensor module from Simblee to give you the most accurate measurements at short range. The RFD77402 uses an infrared VCSEL (Vertical Cavity Surface Emitting Laser) module to measure the amount of time it takes to bounce off a target. This allows low-cost millimeter readings up to two meters! To make it even easier to use this breakout, all communication is enacted exclusively via I2C, utilizing our handy Qwiic system. However, we still have broken out 0.1\" spaced pins in case you prefer to use a breadboard.
Thanks to the RFD77402\'s 850nm VCSEL and electronic driver and optical receiver sensor, this breakout is ideal for distance measurements ranging from 100mm to 2000mm, 1D gesture recognition, obstacle detection and avoidance in robotics applications, and more! The RFD77402 utilizes an I2C interface that supports a direct 8-bit addressing scheme to access the module userâ€™s register set and an additional 16-bit indirect addressing scheme that is mainly used for debugging purpose or special operations.
**NOTE:** The I2C address of the RFD77402 is 0x4C and is hardware defined. A multiplexer/Mux is required to communicate to multiple RFD77402 sensors on a single bus. If you need to use more than one RFD77402 sensor consider using the [Qwiic Mux Breakout](https://www.sparkfun.com/products/16784).
*The SparkFun Qwiic Connect System is an ecosystem of I2C sensors, actuators, shields and cables that make prototyping faster and less prone to error. All Qwiic-enabled boards use a common 1mm pitch, 4-pin JST connector. This reduces the amount of required PCB space, and polarized connections mean you canâ€™t hook it up wrong.*
**Note:** [CLASS 1](http://en.wikipedia.org/wiki/Laser_safety#Class_1) LASER PRODUCT CLASSIFIED IEC 60825-1 2014.