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ENOCH

Description: ENOCH: ENabling On-body Network Contention Handling.

  • Primary Functionality: Document transceiver design for ENOCH paper @ PerCom 2025.
  • Target: Transceiver front end
  • Task: T2.1
  • Responsible: Mengyao Liu

Mengyao Liu, Jonathan Oostvogels, Bingwu Fang, Sam Michiels, Haoxiang Ma, Yang Yang, and Danny Hughes In Proceedings of the IEEE International Conference on Pervasive Computing and Communications (PerCom), Washington, DC, USA, March 17–21, 2025. IEEE, 2025.

Overview​

ENOCH is a low-latency, capacitively coupled on-body communication system optimized for ultra-low-power operation. It employs off-the-shelf components and is programmed on an Arduino Due, making it accessible for researchers and developers interested in body area networks (BANs).

This repository contains all necessary files to replicate and extend our implementation, including:

  • Hardware schematics and PCB design files
  • Arduino source code and API documentation
  • Experimental setups and results

🛠 Hardware Setup​

Component Specifications​

  • Greinacher Voltage Multiplier: A capacitive charge-pump circuit optimized for RF signal rectification.
  • Comparator with RC Low-Pass Filter: Dynamically adjusts thresholds to enhance noise immunity.
  • RF Switches: ADG918 (TX/RX switching) and ADG902 (OOK modulation).
  • Arduino Due: Serves as the processing unit for signal transmission and reception.

PCB Design​

The hardware folder contains:

  • Schematics (.sch) and PCB layout files (.pcbdoc)
  • Gerber files for manufacturing
  • Altium Designer project files

Manufacturing can be done via PCBWay. We recommend using the evaluation board before transitioning to the miniaturized version.

💻 Software Setup​

Requirements​

  1. Install the Arduino IDE
  2. Download this repository
  3. Connect Arduino Due via USB

Compiling & Uploading​

  1. Open Arduino IDE
  2. Select Arduino Due (Programming Port) under Tools → Board
  3. Open enochtx.ino or enochrx.ino
  4. Click Verify (✔) and then Upload (⬆)
  5. Open Serial Monitor to view output

📡 ENOCH API​

To use ENOCH with an Arduino Due, define the following pins:

#define ENOCHTxCarrier 7     // Tx carrier frequency pin
#define ENOCHOOKSW 2         // Modulation (OOK) Switch pin
#define ENOCHRxGPIO 6        // Rx GPIO pin
#define ENOCHTxRxSwitch 8    // Switch for Tx/Rx mode

Available Functions​

void Send_preamble(int cycles); // Transmit preamble
void Send_bytes(byte bytex[]);  // Send data bytes
void Read_bytes(byte load[]);   // Read received bytes
boolean checkRxStatus();        // Check channel availability

⚡ Experiments​

1️⃣ Single Transmitter & Receiver​

  • One ENOCH board transmits, the other receives.
  • The receiver outputs data via Serial Monitor.
  • Evaluate packet delivery reliability by testing different body placements (wrist, arm, ankle).

2️⃣ Multi-Node Contention​

  • Multiple nodes attempt to transmit simultaneously.
  • A hardware trigger button ensures synchronized transmission.
  • Transmission priority is determined by Send_preamble(int cycles).

📂 Repository Structure​

ENOCH/
├── Hardware/       # PCB schematics, Gerber files, and Altium projects
├── Software/       # Arduino source code for Tx and Rx
├── Docs/           # Additional documentation and experiments
├── README.md       # This file

📬 Contact & Contribution​

Feel free to open an issue for questions or contributions. We welcome pull requests to improve the ENOCH project!

📧 Contact: mengyao.liu@kuleuven.be

🔗 Links​

🚀 Bringing robust on-body network contention handling to ultra-low-power systems!