FastAccel | Fast accelerometer sampling for the LG G Watch

FastAccel is a Shell library typically used in Internet of Things (IoT), Arduino applications. FastAccel has no bugs, it has no vulnerabilities and it has low support. You can download it from GitHub.

The accelerometer on a typical smartwatch runs at around 100 Hz, which is sufficient for applications like step-counting and orientation detection (for e.g. raise-to-unlock). However, we found that it was possible to overclock the accelerometer to 4000 Hz on a commodity smartwatch using a software-only modification. At this point, it becomes possible to sense a lot more than just orientation - tiny micro-vibrations propagating through the body are visible in the data stream. Moreover, unlike a microphone, the accelerometer is largely insensitive to outside acoustic noise, making it an ideal vibro-acoustic sensor. This repository contains the software necessary to run the accelerometer at this higher speed. It disables the existing accelerometer driver (INV_MPU_IIO) and substitutes a custom driver, fastacc_mpu, which buffers data at the higher rate and makes it available through a virtual file. We have prepared this kernel image and source for an LG G Watch (W100) running Android 5.0.1 (LWX48P). However, the underlying code should be portable to any Android device with an InvenSense 6xxx or 9xxx Series MPU.