1. What is the heart rate module?
The heart rate module is a heart rate that is professionally used to monitor the human body parts such as the wrist, the forehead, the forehead, the earlobe, and the chest. The module uses the optical principle of the reflective photoelectric heart rate sensor to penetrate the skin to detect the flow of blood, and is processed by a special software algorithm to obtain the current heart rate of the person.
Due to the influence of exercise, the heart rate is also a process of change while the body is exercising. When the human body is at rest, the normal heart rate error is less than 3BPM. The heart rate error of the human body during exercise is relatively large, and the test error is less than 10BPM (normal normal motion is less than 5BPM).
2. Heart rate data calculation?
Calculate the range of exercise heart rate by subtracting the age of the experimenter from 220, which is the maximum heart rate, and then calculating the minimum exercise heart rate and the maximum exercise heart rate using the following formula:
220 one age = maximum heart rate (MHR);
MHR*0.6=minimum exercise heart rate;
MHR*0.9=Maximum exercise heart rate.
3, data analysis
Between the minimum exercise heart rate and the highest exercise heart rate, it is the range of personal exercise heart rate.
If the experimental results are within the range, the physical condition is good and the exercise is sufficient;
If the experimental results are outside the range, the experimenter's physical condition is not good and exercise should be strengthened.
The reason why athletes exercise longer and energetically is because athletes often exercise, so the output of the heart is greater than normal people during exercise, blood circulation is faster, and also attracts more oxygen, making muscle cells Performing aerobic respiration produces more energy.
Normal human pulse recovery time is greater than 10 min, usually 12 min to 15 min. After the exercise, the heart rate can not be restored to the level before exercise in a short time, because the heart rate at the beginning does not have any complex exercise, the body loss is small, at a lower heart rate level.
Second, the program overviewThe RT-H001 heart rate module is specially designed to detect the heart rate (ie, pulse rate, hereinafter referred to as heart rate) by detecting the human body parts such as the wrist, the back of the hand, the forehead, and the ear. The module uses a specific frequency of photons to penetrate the skin and detect the blood. The flow situation is processed by a special algorithm to obtain the heart rate of the human body at that time.
Due to the influence of exercise, the pulse of the human body is also a process of change. When the human body is at rest, the test error is less than 3BPM, and the test error is large when the human body moves, and the test error is less than 10BPM (normally, the normal motion is less than 5BPM).
Third, the program main chip:1, heart rate sensor LST1303
2, precision operational amplifier LST221
3. Low-power MCU
Fourth, the program schematic, physical mapThe module is circular in shape and has a diameter of 12mm. The mounting hole diameter is 1.1mm and the thickness is 1.5mm (the photoelectric sensor is not included, wherein the PCB thickness is 0.4mm. The circuit component height is 1.1mm).
1. Working voltage 3.3V 6.5mA; sleep current: 1uA.
2. Reflective heart rate sensor, superior performance, high sensitivity, good accuracy, and relatively accurate monitoring even during exercise.
3. The module area is small, the customer design is convenient, direct output heart rate data, suitable for secondary product development, such as smart wearable device bracelet, watch, helmet Bluetooth headset smart glasses.
4. Mature, stable performance, low cost, low power consumption scheme, effectively saving product development cycle, easy to use.
Sixth, the application area of ​​the program1, smart watches, health watches, sports watches
2, smart bracelet, healthy bracelet
3, smart glasses, smart helmet
4, smart headphones, Bluetooth headset, sports headphones
5, mouse, wireless mouse
6, game consoles, game controllers
7, treadmill, health physiotherapy equipment
8. Nursing homes, nursing homes, nursing homes
9, car health monitoring system
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