Project Hub /Healthcare Biomedical & Assistive/Pulse Oximeter & Vital Scanner/Smart Wearable Ring

Intermediate

ESP8266

₹500 – ₹1,500

3 – 6 Hours

Partial Kit

Smart Wearable Ring

A DIY smart wearable ring that monitors health parameters in real-time and provides an SOS emergency alert feature using an ESP8266 and ThingSpeak cloud platform.

Originally published on ElectronicsForU

View original tutorial

Parts You'll Need

This project is sourced from another site, not written by us — this list is our best match of their components against what we stock, not a verified bill of materials. Always check the original blog (linked above) for the actual parts list before buying.

NodeMCU ESP8266 WIFI development board based on CP2102 Rs. 660.00
2-Slot 18650 Holder with Protective Cover and On/Off Switch – Case Rs. 109.00
10pcs 5mm RED Diffused Light Emitting Diodes - LEDs Set Rs. 39.00
Jumper Wire 10 Pin Male To Male 20cm Rs. 45.00
MB102 Adjustable Breadboard Power Supply Module (3.3V & 5V) for Arduino & Raspberry Pi Rs. 139.00
400 Points Mini Solderless Prototype PCB Breadboard High Quality Rs. 89.00
Jumper Wire 10 Pin Male To Female 20cm Rs. 45.00

Selected: Rs. 0.00

We don't carry yet: Battery (generic / unspecified)
Pulse / Heart Rate Sensor
LM35 / Analog Temp Sensor

Browse all components

How It Works

The Smart Wearable Ring is an Internet of Things (IoT) health monitoring device powered by a NodeMCU ESP8266 microcontroller. At the core of the circuit are two primary sensing elements: a MAX30100 pulse oximeter sensor and an LM35 temperature sensor. The MAX30100 utilizes optical sensors—typically red and infrared LEDs combined with a photodetector—to measure blood oxygen saturation levels and heart rate via photoplethysmography (PPG). Simultaneously, the LM35 temperature sensor monitors ambient or skin temperature by outputting an analog voltage linearly proportional to Celsius temperature. The NodeMCU ESP8266 reads data from these sensors, processing the digital and analog inputs. A physical push button is integrated into the circuit to trigger a manual input event, such as an emergency SOS signal, while an LED provides visual status feedback. Utilizing the ESP8266's onboard Wi-Fi capabilities, the microcontroller connects to a wireless network and transmits the gathered biomedical data in real-time to the ThingSpeak cloud platform. Once data reaches ThingSpeak, users can visualize trends, log health parameters, and remotely monitor patient vitals from anywhere with an internet connection, effectively bridging local hardware sensing with remote cloud telemetry.

Why Build This

Design and implement a functional, wearable IoT medical telemetry prototype suitable for remote patient monitoring and telemedicine applications.

Gain hands-on experience integrating multiple distinct sensors (optical I2C and analog) with a Wi-Fi-enabled microcontroller.

Develop cloud-connected embedded software that transmits real-time physiological data to an IoT dashboard for remote tracking and emergency alerting.

Real-World Application

Remote patient health monitoring, elderly care, and emergency SOS safety alerting systems.

Skills You'll Learn

I2C communication protocol

analog-to-digital conversion

Wi-Fi data transmission via ESP8266

cloud IoT dashboard integration with ThingSpeak

sensor data acquisition and filtering

GPIO interrupt and push button handling

Safety Precautions

Ensure proper wiring and stable power supply connections to avoid short circuits.

Technology Tags

ESP8266

NODEMCU

IOT

THINGSPEAK

HEALTH MONITORING

PULSE OXIMETER

MAX30100

LM35 TEMPERATURE SENSOR

WEARABLE TECHNOLOGY

Frequently Asked Questions

How does the MAX30100 sensor measure heart rate and blood oxygen?

The MAX30100 shines red and infrared light through the tissue and measures the amount of light reflected back to a photodetector. Changes in light absorption caused by pulsating blood flow allow the system to calculate pulse rate and blood oxygen saturation (SpO2).

Can the NodeMCU ESP8266 connect to any standard Wi-Fi network?

Yes, the ESP8266 supports standard 2.4 GHz Wi-Fi networks (802.11 b/g/n). You will need to hardcode your router's SSID and password into the Arduino IDE code so the device can connect to the internet.

How is the ring powered during operation?

The project uses a 5V battery to provide portable power to the breadboard and components, allowing the circuit to function as a wearable device rather than remaining tethered to a USB port.

Gallery

This page is part of Kitkraft's Project Hub — a curated collection of electronics & robotics projects gathered from the maker community to help students and hobbyists discover and learn to build. Kitkraft does not claim authorship of the original project, and makes no representation as to the accuracy, completeness or safety of third-party source material. The summary and "How It Works" explanation above are AI-generated, rewritten with reference to the original tutorial — not a reproduction of it. Full credit and a direct link to the original source are provided above. If you're the original creator and have a concern about how your work is represented here, please contact us and we'll address it promptly.

Kitkraft Project Hub — curated from the maker community, credited at the source.

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