This little thing is simple and fun, and can be used as a course design for beginners of microcontrollers.
Place your index finger gently on the sensor and you will see the LED indicator flashing with your heartbeat. After 15 seconds, your current heart rate will be displayed on the digital tube.
The core part is on the sensor, which uses a set of infrared tubes.
The arteries at the fingertips of the human body are relatively developed. When the arteries contract and relax periodically with the heart, the blood volume in the blood vessels will also change.
At this time, the infrared receiving probe can collect the corresponding light pulse signal, which is sent to the microcontroller after denoising and amplification, and then processed to obtain the heart rate data.
Schematic diagram of the acquisition part
Schematic diagram of the operation and display part
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Recommended ReadingLatest update time:2024-11-16 21:45
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