NOTE: Consider buying the latest version MAX30102 from one of the links below.

Option 1. MAX30102 MH-ET LIVE Oximeter Heart Rate Beat Pulse Sensor 3.3V

Option 2. MAX30102 Oximeter Heart Rate Beat Pulse Sensor 1.8-3.3V

The MAX30100 is an integrated pulse oximetry and heart rate monitor sensor solution. It combines two LEDs, a photodetector, optimized optics, and low-noise analog signal processing to detect pulse oximetry and heart-rate signals. The MAX30100 operates from 1.8V and 3.3V power supplies and can be powered down through software with negligible standby current, permitting the power supply to remain connected at all times. Heart Rate click carries Maxim’s MAX30100 integrated pulse oximetry and a heart-rate sensor. It’s an optical sensor that derives its readings from emitting two wavelengths of light from two LEDs – a red and an infrared one – then measuring the absorbance of pulsing blood through a photodetector. This particular LED color combination is optimized for reading the data through the tip of one’s finger. The signal is processed by a low-noise analog signal processing unit and communicated to the target MCU through the mikroBUS I2C interface. Developers of end-user applications should note that the readings can be negatively impacted by excess motion and changes in temperature. Also, too much pressure can constrict capillary blood flow and therefore diminish the reliability of the data. A programmable INT pin is also available.

Features:

• Working voltage: 1.8 ~ 5.5VDC
• Shutdown Current: 0.7µA
• Optical sensor: IR and red LED combined with a photodetector
• Measures absorbance of pulsing blood
• I2C interface plus INT pin
• 3.3V power supply complete pulse oximeter and heart rate sensor solution, simplifies design, integrated LEDs, photo sensor, and
• high-performance analog front
• Ultra low power operation increases battery life for wearable devices
• Advanced functionality improves measurement performance, high SNR provides robust motion artifact resilience integrated
• ambient, light cancellation high sample rate capability fast data output capability
• It is an integrated pulse oximetry and heart rate monitor sensor solution.

NOTE: There is a minor fix required on some modules. Please check the guide below to make it working step by step.

Fix option 1: Cut a trace and connect two pins (Preferred)

Last Minute Engineers

Fix option 2: Remove 3 resistors and externally pullup the pins

Circuit Digest