Microcontroller entry design: a simple and fun heart rate meter-EEWORLD

Collect

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.

[page]

Schematic diagram of the acquisition part

Schematic diagram of the operation and display part

Reference address：Microcontroller entry design: a simple and fun heart rate meter

Previous article：Design and implementation of intelligent charger based on PIC microcontroller
Next article：Design of unmanned cleaning and nursing machine based on GSM and PIC microcontroller

Recommended ReadingLatest update time:2024-11-16 21:01

Design of Photoelectric Coordinate Sensor

Introduction Small area coordinate measurement technology has important engineering application value. Coordinate sensor is the key component in this field. Photoelectric element design is adopted because of its high precision, high resolution and large dynamic range. It uses

[sensor]

Design of antifreeze control circuit for wind sensor of automatic weather station

introduction The wind sensors of automatic weather stations in Finland and other countries mostly use heating devices with power ≤4W, and only consider the temperature index. Under weather conditions with a temperature of ≤4℃, the automatic weather station automatically starts the heating device to heat the win

[Industrial Control]

Design of antifreeze control circuit for wind sensor of automatic weather station

CMOS image sensors provide visual perception for self-driving cars

CMOS Image Sensor Gives Eyes to Autonomous Vehicles CMOS image sensors provide visual perception for self-driving cars To achieve fully autonomous vehicles, information from multiple sensors needs to be integrated, of which information from cameras may be the most important. These cameras must be able to continuous

[sensor]

Innovation in sensor technology

Sensors are the "eyes" and "ears" of processors, coprocessors, and computing modules. They come in all shapes, forms, and functions, and are deployed in an increasing number of applications. From edge computing and the Internet of Things, to smart cities, smart manufacturing, hospitals, industry, machine learning, and

[Automotive Electronics]

Micro-Open Semiconductor launches anti-static Hall sensor

Microchip Semiconductor recently launched an anti-static linear Hall sensor, the latest sensor in the company's HAL 83x series. This sensor can be applied to most automotive electrical system environments and has good working stability. Since it can accurately measure linear motion, it can be used for position detec

[Automotive Electronics]

Micro-Open Semiconductor launches anti-static Hall sensor

Kelvin bridge is one of the best solutions for measuring sensor resistance

Problem: I need to determine the change in resistance of a low resistance sensor, and my plan was to simply apply a known voltage across the thin wire sensor leads and measure the current. Then using Ohm's Law (Resistance = Voltage / Current or R = V / I), I can easily calculate the sensor resistance. However, the nom

[sensor]

Wireless sensor network node production and networking design based on single chip microcomputer

1. Introduction 　　As early as the 1970s, the prototype of sensor networks using point-to-point transmission and connecting sensor controllers appeared. We attribute it to the first generation of sensor networks. With the continuous development and progress of related disciplines, sensor networks also have the abi

[Microcontroller]

Wireless sensor network node production and networking design based on single chip microcomputer

Distributed detection method of vibration signal based on single chip microcomputer and sensor

Introduction Due to the distance limit of the connecting cable of the acceleration sensor and the charge amplifier, it is difficult to implement a centralized data acquisition and processing system in a space with a long distance, and its reliability and anti-interference problems are difficult to solve. Distributed

[Microcontroller]

Distributed detection method of vibration signal based on single chip microcomputer and sensor

Popular Resources
Popular amplifiers