README

This repository contains the code, pcb design, and documentation for the Pedestrian Audio Wearable System (PAWS) front-end, headset, embedded platform.

PAWS is a low-power connected system for improving pedestrian safety in current and future smart cities. PAWS uses microphones embedded into a headset combined with low-power feature extraction, signal processing, and machine learning, for detecting, localizing, and providing alerts of oncoming vehicles to pedestrians in noisy environments.

• Note: The PAWS project was at some point known as SEUS, which is why SEUS is used at some points rather than PAWS.

The contents of this repository are summarized below.

• PAWS: Contains the PAWS front-end source code and designs.
  • nordic_nRF52: Contains the project files for building and flashing the firmware for the Nordic nRF52 BLE chip used for wireless communication with the PAWS smartphone application.
  • stm32f4: Contains the project files for building and flashing the firmware for the STM32F4 chip used for feature extraction in PAWS.
  • pcb: Contains the pcb schematics, designed using Altium Circuitmaker, for the PAWS embedded platform as well as documentation for how to maintain the PAWS headset. The platform uses a STM32F4 Chip for feature extraction + the Nordic nRF52 BLE chip for transmission to the smartphone.
• PAWS_LE: Contains the PAWS LE front-end source code and designs. PAWS LE is the low-energy variant of PAWS and has finer granularity car localization, achieved by using a technique called Angle via Polygonal Regression (AvPR).
  • nordic_nRF52: Contains the project files for building and flashing the firmware for the Nordic nRF52 BLE chip used for wireless communication with the PAWS LE smartphone application.
  • pcb: Contains the pcb schematics, designed using Altium Circuitmaker, for the PAWS LE embedded platform. The platform uses a custom-build ASIC for relative delay extraction + the Nordic nRF52 BLE chip for transmission to the smartphone.

Reproducing the PAWS system

To reproduce the PAWS system, you must first install the PAWS smartphone application; details on how to do this can be found in the PAWS-Smartphone repository.

Next, you must reproduce the PAWS front-end PCB. Details on how to do this can be found in the ./PAWS folder.

Reproducing the PAWS LE System

To reproduce the PAWS LE system, you must first install the PAWS LE smartphone application; details on how to do this can be found in the PAWS-Smartphone repository.

Next, you must reproduce the PAWS LE front-end PCB. Details on how to do this can be found in the ./PAWS_LE folder.

More About the PAWS Project

To learn more about PAWS, please visit our project page, or contact us at: stephen.xia@columbia.edu.

This repository is part of the Pedestrian Audio Wearable System (PAWS) project of the Intelligent and Connected Systems Lab (ICSL), Columbia University. For more information about our latest projects, please visit our group website.