In this article, we will introduce a method to calculate heart rate using the analog signal output from a pulse sensor. This method has been tested and the resulting heart rate values are quite accurate, with high measurement efficiency. First, let’s introduce the pulse sensor used in this article. This sensor measures the intensity of … Read more
Here is another group sharing for Problem F:Re-testing the first place of this group! We are the team from Hunan Normal University (Major: Applied Electronic Technology), and we won the national first prize for Problem F in the 2019 Electric Competition. We measured 135 sheets and are very happy to be invited by Darlwen to … Read more
Ultrasonic Sensor Ultrasonic waves are sound waves that exceed the limits of human hearing, with a vibration frequency above 20 kHz. When working, the ultrasonic sensor converts between voltage and ultrasonic waves. When the ultrasonic sensor emits ultrasonic waves, the probe converts voltage into ultrasonic waves and emits them. When receiving ultrasonic waves, the receiving … Read more
Complete Video The ultrasonic sensor is an input module that provides excellent non-contact distance detection, stable performance, ease of use, a small blind spot, and high accuracy. The measuring distance ranges from 2 centimeters to 400 centimeters, and the best part is that it is very inexpensive. It is widely used in the maker community, … Read more
Example Effect Press the serial monitor, and you can see that the measured distance is 9.8cm-10.1cm with an error of about 0.2cm. HC-SR04 An ultrasonic sensor used for distance measurement, widely applied in robotics to avoid obstacles and measure distances. Its module uses Trig to trigger distance measurement, which emits 8 40kHz square waves and … Read more