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| 1 | +<img src="docs/images/wulpus_main.png" alt="WULPUS main" width="100%"/> |
| 2 | + |
| 3 | +# WULPUS: |
| 4 | +## Wearable Ultra Low-Power Ultrasound |
| 5 | + |
| 6 | +# Introduction |
| 7 | + |
| 8 | +This repository contains the work in progress on the WULPUS ultrasound probe. |
| 9 | + |
| 10 | +WULPUS is a truly wearable ultra-low-power open research ultrasound platform. |
| 11 | + |
| 12 | +The probe has the following features: |
| 13 | +- **8 channels** (time-multiplexed) |
| 14 | +- **8 Msps** Analog-to-Digital converter (12 bit resolution) |
| 15 | +- **30.8 dB** Programable-Gain Amplifier + **10 dB** Operational Amplifier |
| 16 | +- **Bluetooth Low Energy** (BLE) wireless link (320 kbps throughput) |
| 17 | +- Up to **50 acquisitions per-second** (APS) (400 samples per acquisition, raw data streaming mode) |
| 18 | +- **Compactness** (46 x25 mm footprint) |
| 19 | +- **Ultra-Low Power** consumption of **22 mW** (raw data streaming mode, 50 APS) |
| 20 | + |
| 21 | +# WULPUS system diagram |
| 22 | + |
| 23 | +WULPUS probe comprises two printed circuit boards (PCBs): |
| 24 | +- Acquisition PCB: featuring an ultrasound MCU (MSP430FR5043) and BLE MCU (nRF52832) |
| 25 | +- High-Voltage PCB: featuring a High-voltage multiplexer (HV MUX), a transmit/receive switch, and a MOSFET driver. |
| 26 | + |
| 27 | +<img src="docs/images/wulpus_system_diagram.png" alt="WULPUS System Diagram" width="100%"/> |
| 28 | +WULPUS System Diagram |
| 29 | + |
| 30 | +# Structure of the repository |
| 31 | + |
| 32 | +This repository has the following folders: |
| 33 | + |
| 34 | +- `fw`, containing the firmware source code, namely: |
| 35 | + - source code for the nRF52832 MCU of the WULPUS probe, located at `fw/nrf52/ble_peripheral/US_probe_nRF52_firmware` |
| 36 | + - source code for the nRF52840 USB dongle, located at `fw/nrf52/peripheral/US_probe_dongle_firmware` |
| 37 | + - source code for the MSP430 ultrasound MCU (will be added in the next release under the `fw/msp430` folder) |
| 38 | +- `sw`, containing the Python code for the WULPUS Graphical User Interface |
| 39 | + |
| 40 | +- `hw`, containing the Altium designer source files and pdf schematics for |
| 41 | + - WULPUS Acquisition PCB (located at `hw/wulpus_acquisition_pcb`) |
| 42 | + - WULPUS High-Voltage PCB (located at `hw/wulpus_hv_pcb`) |
| 43 | + |
| 44 | +- `docs`, containing the project documentation (e.g., images of the device, user guide, ...) |
| 45 | + |
| 46 | +# How to reproduce? |
| 47 | + |
| 48 | +To build your own instance of WULPUS, the following steps should be completed: |
| 49 | +1. *PCBs manufacturing and assembly*<br> |
| 50 | + You can find the design files (Altium source files, schematics, bills of materials) under the `hw` folder. |
| 51 | +2. *Flashing MSP430 firmware*<br> |
| 52 | + You can find the instructions on seting-up the toolchain, compiling the firmware and flashing the MSP430 MCU in the `fw/msp430` folder. |
| 53 | +3. *Flashing nRF52 MCU and USB dongle firmware*<br> |
| 54 | + You can find the instructions on setting-up the toolchain, compiling the firmware, flashing the nRF52 MCU and USB dongle in the `fw/nrf52` folder. |
| 55 | +4. *Python dependencies installation on the host PC*<br> |
| 56 | + Follow the instructions in the `sw` folder to install the dependencies. |
| 57 | + |
| 58 | +# Usage |
| 59 | + |
| 60 | +- Power up the probe, either from the micro-USB connector or from the battery connector |
| 61 | +- Connect the USB dongle to the host PC |
| 62 | +- Activate the Python environent, launch the Jupyter notebook located in `sw` folder, and follow the instructions in the notebook |
| 63 | + |
| 64 | +# Citation |
| 65 | +If you would like to reference the project, please cite the following paper: |
| 66 | + |
| 67 | +``` |
| 68 | +@inproceedings{frey2022wulpus, |
| 69 | + title={WULPUS: a Wearable Ultra Low-Power Ultrasound probe for multi-day monitoring of carotid artery and muscle activity}, |
| 70 | + author={Frey, Sebastian and Vostrikov, Sergei and Benini, Luca and Cossettini, Andrea}, |
| 71 | + booktitle={2022 IEEE International Ultrasonics Symposium (IUS)}, |
| 72 | + pages={1--4}, |
| 73 | + year={2022}, |
| 74 | + organization={IEEE} |
| 75 | +} |
| 76 | +``` |
| 77 | + |
| 78 | +## Authors |
| 79 | + |
| 80 | +The WULPUS system was developed at the [Integrated Systems Laboratory (IIS)](https://iis.ee.ethz.ch/) at ETH Zurich by: |
| 81 | +- [Sergei Vostrikov](https://scholar.google.com/citations?user=a0KNUooAAAAJ&hl=en) (Firmware, Software, Open-Sourcing) |
| 82 | +- [Sebastian Frey](https://www.linkedin.com/in/sebastian-frey-8b576b194/) (Firmware, PCB design) |
| 83 | +- [Luca Benini](https://scholar.google.com/citations?hl=en&user=8riq3sYAAAAJ) (Supervision, Conceptualization) |
| 84 | +- [Andrea Cossettini](https://scholar.google.com/citations?user=d8O91jIAAAAJ&hl=en) (Supervision, Project administration) |
| 85 | + |
| 86 | +# References |
| 87 | + |
| 88 | +[1] - Frey, Sebastian, Sergei Vostrikov, Luca Benini, and Andrea Cossettini. "WULPUS: a Wearable Ultra Low-Power Ultrasound probe for multi-day monitoring of carotid artery and muscle activity." In 2022 IEEE International Ultrasonics Symposium (IUS), pp. 1-4. IEEE, 2022. |
| 89 | + |
| 90 | +# License |
| 91 | +The following files are released under Apache License 2.0 (`Apache-2.0`) (see `sw/LICENSE`): |
| 92 | + |
| 93 | +- `sw/` |
| 94 | + |
| 95 | +The following files are released under Solderpad v0.51 (`SHL-0.51`) (see `hw/LICENSE`): |
| 96 | + |
| 97 | +- `hw/` |
| 98 | + |
| 99 | +The following files are released under Creative Commons Attribution 4.0 International |
| 100 | +License (`CC-BY-4.0`) (see `docs/images/LICENSE`): |
| 101 | + |
| 102 | +- `docs/images/` |
| 103 | + |
| 104 | +The `fw/msp430/` and `fw/nrf52/` directories contain third-party sources that come with their own |
| 105 | +licenses. See the respective folders and source files for the licenses used. |
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