EMF wrist band

An Emf wrist band / brecelet

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🌟 Inspiration & Overview

In our increasingly connected world, we are constantly surrounded by invisible electromagnetic fields (EMF). The EMF Wrist Band is a waterproof revolutionary, health-focused device designed to bridge the gap between environmental awareness and daily utility.

Acting as both a sleek, landscape digital watch and a real-time, radiation tracker, this miniature wearable helps users manage their personal health by monitoring baseline environmental signals. It combines everyday utility (time gadget) with modern therapeutic wellness, seamlessly integrating two vital functions into a singular, compact item.

🛠️ How It Works

The device operates on a minimalist hardware framework powered by an ultra-tiny ATtiny 85 microcontroller, a custom RV.8263-c8 Real-Time Clock (RTC), and a high-density matrix of (129 leds) SK6805-EC15 micro (50mm*15 mm) leds (arranged in a 27x7 horizontal serpentine layout (50mm*15 mm matrix)). ** (2) 1.5v 5mm*20mm) Elastic solar sheets** with a IN4148 diode (which prevents voltage backflow from circuit to solar sheets) to help in charging the battery and as an additional power supply. ** 2 (N-type button cell (1.5v) 5.8mm diameter × 3.1mm height)** to act as the storage and supply of power for the system or the circuit. ** A (thick<1.5mm) Coin vibrator** a small vibrator for a 1 low vibrate at detection alert of a medium emf and 1 meduim vibrate at a high emf.

Because the ATtiny 85 chip only contains 512 bytes of SRAM (RAM) RAM, it stores no frame buffer. Instead, it handles all visual font assets and signal calculations completely on-the-fly inside working registers, streaming high-speed data feeds down a single signal line:

  1. Environmental Sampling: A solid copper antenna measures ambient field variations. The analog voltage signal is quantified via the internal 8-bit Analog-to-Digital Converter (ADC) using the following baseline relation: \( V_{\text{EMF}} = \frac{\text{ADC_Value}}{255} \cdot V_{\text{VCC}} \)
  2. Dynamic Processing: The microcontroller evaluates the raw value against mathematically defined safety limits: $$\text{Status}(V_{\text{EMF}}) = \begin{cases} \text{Green (Safe)}, & \text{if } V_{\text{EMF}} < \theta_{\text{med}} \ \text{Yellow (Warning)}, & \text{if } \theta_{\text{med}} \le V_{\text{EMF}} < \theta_{\text{high}} \ \text{Red (Danger)}, & \text{if } V_{\text{EMF}} \ge \theta_{\text{high}} \end{cases}$$
  3. On-the-Fly Streaming: The logic checks every layout column index on-the-fly, combining clock numerals with pixel visual vectors to generate active RGB bitstreams within strict 800kHz timing blocks.

✨ Cool Features

  • Dual-State Interface: A manual, button cycles between full-screen time tracking and an independent real-time diagnostic dashboard. i.e It triggers manual switching in addition to the automatic powering algorithm.
  • Intelligent Power Management: The landscape digital clock screen automatically turns off screen after 7s seconds of inactivity to conserve battery power.

  • Invisible Shield Guard (Auto-Wake): While blacked out, the system pulses awake for 1 millisecond every 25 milliseconds to scan the environment using an inbuild 2 inch copper antenna sheets. If it crosses the warning boundary (\( \theta_{\text{med}} \)), it automatically wakes the array to display live threat alerts and also provide a vibrate accordingly.

  • Overload Visual Vector: If ambient fields saturate the sensor, the numerical readout clears and displays on the emf info which includes the emf value, intensity and a graph, the texts' and bar's color depends on value weight, green for normal emf , yellow for medium, and red for highest "MAX+" message.

  • Integrated Oscillation VU Graph: The right quadrant of the horizontal array displays a real-time vertical equalizer bar graph scaled dynamically across the 7-row height: \( \text{Bar_Height} = \left\lfloor \frac{V_{\text{EMF}}}{36} \right\rfloor \)

  • Solar-Assisted Power Matrix: A flexible, sub-miniature solar sheets which are located besides each side the screen at the brecelet face are connected with a IN4148 blocking diode to trickle-charge the main lithium cell under ambient daylight.

💥 Challenges . largest hurdle was resource compatibility in a micro-footprint. Fitting 189 addressable RGB pixels, a logic controller,vibrator, battery, a power management framework, solar sheets, MAX31341B (rtc) module, etc into a tiny, flexible bracelet housing pushed extreme architectural bounds.

A circuit design software. The real circuit design improvised with only a diagramic circuit due to the no access (personal computer) to equipment for real programming circuit. This brought up a huge problem to logic testing. Little details of the product. The 3d designn model and positioning of the circuit into the 3d casing was not possible due to the reason of no access for the 3d medel en rendering.

Eliminating an external frame buffer required abandoning heavy graphics libraries. raw, low-level inline assembly code routines had to be written to handle the exact nanosecond pulse delays required by the light grid while staying under the ATtiny10's 1,024-byte flash limit.

🎉 Accomplishments That being Proud Of

  • Ultra-Dense Hardware Compacting: The successful mapping, routing, of complex operational components into a slim wearable therapy.
  • Dual-Ideology Concatenation: Paired everyday functionality (a digital watch) with preventative health monitoring (an EMF tracker) into a single, cohesive item.
  • High Efficiency Without RAM: Creating an on-the-fly rendering mathematical loop that bypasses traditional video RAM bottlenecks.
  • Sealed Therapeutic Utility: Engineereing a lightweight, protective layout that keeps delicate components completely safe from water and dust while remaining flexible for therapeutic wrist wear. Neutral compositiion: Ensuring usage of neutral equpements, coomponents eg the rubber cover to ensure that it has no physical en ray effects on the human body, ie allergies --- ## 🧠 Knowledge Learned. Building the EMF Wrist Band forced development of a deep, practical knowledge of ideological compaction.learning how to stripe away hardware redundancies, share I/O control pins seamlessly across multiple chips, and program directly onto microchip registers to maximize performance from minimalist, low-power processing frameworks.

The EMF Wrist Band stands as proof that you do not need bulky, power-hungry computers to build helpful tools for daily wellness management!

Built With

  • ambient
  • c
  • c++
  • desighns
  • emf
  • iot
  • programming
  • python
  • radio
  • rtc
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