Water Level Assistant for blinds Children

A rechargeable assistive device developed for Giza Systems Foundation to help children safely fill cups using intelligent water-level detection with visual and audible alerts.

  • https://www.facebook.com/ProjectNitrous/
  • Medical Electronics
  • Embedded C Custom PCB Medical Electronics Assistive Technology Water Level Detection USB Type-C Lithium Battery Battery Management Low Power Design LED Indicators Buzzer Product Design PCB Manufacturing SMD Assembly Mass Production Quality Control
  • Giza systems
  • 04/10/2025

Project Overview

The Smart Water Level Assistant was developed in collaboration with Giza Systems Foundation as a social impact project aimed at helping children safely fill drinking cups without overflowing.

The compact device uses dual conductive probes to detect when water reaches a predefined level. Once detected, it immediately activates an audible alarm and LED indicator, notifying the child to stop pouring. The device is battery-powered, rechargeable via USB Type-C, and designed for everyday use with a battery life of up to one week per charge.

Metanoia was responsible for the complete product development process, including electronics design, embedded firmware, PCB manufacturing, enclosure integration, testing, and mass production.

A total of 200 production units were successfully manufactured and delivered.

Client Requirements

The client required a device capable of:

  • Detecting water reaching a preset level.
  • Providing immediate audible and visual alerts.
  • Being safe for children.
  • Operating on a rechargeable battery.
  • Supporting USB Type-C charging.
  • Offering long battery life.
  • Compact and lightweight design.
  • Reliable daily operation.
  • Mass production readiness.

Our Solution

Metanoia designed and manufactured a complete assistive device including:

  • Custom PCB Design.
  • Embedded Control System.
  • Water Level Detection Circuit.
  • LED Status Indicator.
  • Audible Alarm.
  • USB Type-C Charging.
  • Rechargeable Lithium Battery.
  • Low Power Firmware.
  • Compact Product Integration.
  • Production-Ready Electronics.

Main Features

Smart Water Level Detection

Two conductive probes detect when the water reaches the desired level, triggering an instant notification.

Audible & Visual Alerts

The device provides:

  • Bright LED indication.
  • Loud audible alarm.

allowing children to stop pouring immediately.

Rechargeable Battery

Powered by an integrated lithium battery offering up to one week of operation on a single charge.

USB Type-C Charging

Convenient charging using a standard USB Type-C connector.

Low Power Design

Optimized firmware and hardware maximize battery life while maintaining reliable operation.

Child-Friendly Design

Compact, lightweight, and easy to attach to different cup sizes, making it suitable for daily use.

Engineering Challenges

Reliable Water Detection

Developing an accurate sensing circuit that works consistently with different water conditions.

Low Power Consumption

Optimizing electronics and firmware to achieve week-long battery life.

Compact Product Integration

Designing a complete electronic system inside a small enclosure while maintaining durability and ease of use.

Production Readiness

Preparing the product for efficient manufacturing and quality control across hundreds of units.

Development Process

1. Product Concept

Designed specifically as an assistive device to improve children’s independence and safety.

2. Hardware Development

Designed a custom PCB integrating sensing, battery management, charging, LEDs, and alarm circuitry.

3. Embedded Firmware

Developed firmware for water detection, alert handling, battery management, and power optimization.

4. Mechanical Integration

Integrated electronics into a compact enclosure suitable for everyday use.

5. Manufacturing

Produced and assembled 2000+ units, followed by testing and quality assurance before delivery.