MAX30100 Pulse Oximeter and Heart-Rate Sensor Module – I2C Heart Rate Sensor (Purple)

The MAX30100 module (purple) is a pulse oximeter and heart-rate sensor that combines a red LED, an infrared LED and a photodetector. Place a finger on the sensor and it measures heart rate (BPM) and blood oxygen level (SpO2) and sends the data over I2C. It is widely used in health-monitoring and IoT projects with Arduino and ESP32.

Specifications

Key Features

• Heart rate and SpO2 in one small module
• I2C – needs only 2 data pins
• Low power consumption
• Works with MAX30100lib / SparkFun libraries

Applications

• IoT health monitoring with ESP32 and a mobile app
• Wearable fitness band prototypes
• Patient monitoring student projects
• Biomedical engineering labs

FAQ

What is the operating voltage?
3.3V – 5V (onboard regulators).

Is it a medical device?
No. It is for learning and prototyping, not for medical diagnosis.

Why do I get 0 readings?
Some modules have I2C pull-ups to 1.8V; use the right library settings or a level-shifter, and keep the finger steady.

Can I buy the MAX30100 Pulse Oximeter and Heart-Rate Sensor Module in Kanpur?
Yes – buy online with delivery across India, or pick it up from the iTechBuilders store, Damodar Nagar, Kanpur.