Project Hub /IoT & Connected Devices/Air Quality Monitoring/Make Your Own Temperature And Pulse Oximeter

Intermediate

ESP32

₹1,500 – ₹5,000

3 – 6 Hours

Partial Kit

Make Your Own Temperature And Pulse Oximeter

Build a custom IoT-enabled temperature and pulse oximeter using an ESP32 and a modified MAX30100 sensor module.

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.

ESP32 WiFi+Bluetooth CP2102 Development Board Rs. 520.00
DS18B20 Water Proof Temperature Probe Out of stock
10pcs 5mm RED Diffused Light Emitting Diodes - LEDs Set Rs. 39.00
Jumper Wire 10 Pin Male To Male 20cm Rs. 45.00
10pcs - 220 ohm 1/4 W Resistor Set Rs. 39.00
400 Points Mini Solderless Prototype PCB Breadboard High Quality Rs. 89.00
MB102 Adjustable Breadboard Power Supply Module (3.3V & 5V) for Arduino & Raspberry Pi Rs. 139.00
Jumper Wire 10 Pin Male To Female 20cm Rs. 45.00

Selected: Rs. 0.00

This list includes a generic resistor set as a placeholder — it is not matched to the exact value or part number this circuit needs. The correct one is specified on the original source page linked above; check it before buying.

We don't carry yet: Pulse / Heart Rate Sensor

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How It Works

This IoT-enabled health monitoring system centers around the ESP32 microcontroller, which coordinates data acquisition from physiological sensors and transmits it to the cloud. The MAX30100 pulse oximeter module uses optical sensors with red and infrared LEDs to measure blood oxygen saturation (SpO2) and heart rate, communicating its readings back to the ESP32 over a standard digital interface. Simultaneously, the DS18B20 digital temperature probe measures ambient or body temperature, utilizing the 1-wire protocol via a data pin coupled with appropriate pull-up resistors. Once the ESP32 collects these biological metrics, its integrated Wi-Fi capabilities take over. Running code developed in the Arduino IDE with the necessary ESP32 board packages installed, the microcontroller formats the sensor data and sends it outward using the ThingSpeak API integration. This pushes the metrics to an online dashboard for real-time visualization and remote tracking. An onboard indicator LED provides visual feedback regarding the operational status, connection state, or successful data transmission cycles. Powered by carefully managed circuit connections made through jumper wires, the entire assembly transforms raw biological inputs into actionable, cloud-accessible health analytics.

Why Build This

Design and deploy an end-to-end biomedical IoT data pipeline suitable for remote patient monitoring and telemedicine applications.

Gain practical engineering experience integrating optical and thermal sensors with a modern Wi-Fi-enabled microcontroller.

Implement cloud data logging via RESTful APIs to analyze continuous physiological time-series data remotely.

Real-World Application

Home health monitoring, remote patient monitoring, and personal health tracking during viral outbreaks or general wellness checks.

Skills You'll Learn

I2C communication

1-Wire protocol implementation

Wi-Fi networking on microcontrollers

REST API integration

cloud dashboard configuration

sensor signal conditioning

Safety Precautions

Ensure jumper wires and components in contact with body parts are smooth, secure, and properly insulated to prevent skin irritation or short circuits.

Technology Tags

ESP32

MAX30100

DS18B20

I2C

TEMPERATURE SENSOR

PULSE OXIMETER

IOT

THINGSPEAK

WI-FI

Frequently Asked Questions

Why is an ESP32 used instead of a standard Arduino Uno?

The ESP32 includes built-in Wi-Fi capabilities required to connect to the ThingSpeak API and transmit data to the cloud, whereas standard Arduino boards require additional network shields.

How does the MAX30100 measure heart rate and blood oxygen?

It uses light-emitting diodes and a photodetector to measure the absorbance of pulsing blood in the capillaries, translating optical variations into SpO2 and pulse metrics.

What is the purpose of the resistors in this circuit?

Resistors are primarily used as pull-ups for communication lines, such as the 1-Wire data line for the DS18B20 probe, ensuring reliable digital signal transmission.

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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