can you please help me check it, thank you Later I thought of apple watch, when a user touches the screen with two fingers, the sensor in the watch can detect his real-time heart rate, Then using electronic signal to simulate his heart rate according to the value. So that this kind of real physiological signal is delivered to the other user in real time. A virtual beating heart accompanied with a very real vibration and sound, which is a really sweet way of interaction. So inspired by this, another type of sensor I came up with is the Heart rate and pulse sensor. There are mainly two types of heart rate sensors on the market. One is a photoelectric heart rate sensor that measures according to the volume of light reflection. Although its measurement accuracy is lower, the advantage is that it is quite small and portable, so nearly all current mobile terminals are measured with this sensor. The other type is an electrode type heart rate sensor that measures the heart rate changes with the potential gap of different parts of the human body. This kind of sensor is used on electrocardiogram in the hospital. Although this method is accurate, it is necessary to detect two parts of the human body at the same time. When we use mobile phones and watches in our daily life, we only have one-handed contact with the product, so we cannot monitor continually with this sensor.