This work involves the design of a device that measures the heart rate. The purpose of using a pulse meter is to check how well the heart pumps blood through the body. This device is used to monitor the health of people and their ability to tolerate physical activity. For implementation, an OLED screen, Arduino UNO board, pulse sensor, a Bluetooth data transmission module and a buzzer will be used to emit the sound of the heartbeat.

The heart rate sensor is an Arduino-compatible device that can be easily connected and used. It consists of an integrated optical amplification circuit and a noise elimination circuit to ensure accurate pulse measurement.

A common pulse oximeter consists of an electronic processor and a pair of small light-emitting diodes (LEDs) that are directed towards a photodiode through a translucent part of the patient's body, such as the fingertip or earlobe. One LED emits red light at a wavelength of 660 nm, while the other emits infrared light at a wavelength of 940 nm. Oxygenated hemoglobin absorbs more infrared light and allows more red light to pass through, while deoxygenated hemoglobin allows more infrared light to pass through and absorbs more red light.

The processor calculates the ratio between the measurements of red and infrared light, and then utilizes a lookup table based on the Beer-Lambert law to convert it into SpO2 (oxygen saturation).

Components: Arduino UNO R3 CH340 ;OLED Display 0.91” I2C IIC Blue ,LED 5mm ,Active buzzer 5v ,Pulse sensor XD-58C ,HC-05 Bluetooth serial-module ,Transistor BC547

Export to PDF