Previously, we introduced the process of discovering services and characteristics. Today, let’s take a look at what happens next.In the software, we click to control the light to turn it on and off. The data sent by the host is as follows:Captured dataOperation codeOperation code 0x12: write request.Write requestWriting the value 0x0001 to the attribute … Read more
The multimeter, also known as a multifunction meter, three-in-one meter, or universal meter, is a versatile and multi-range measuring instrument. Generally, a multimeter can measure direct current, direct voltage, alternating voltage, resistance, and audio levels. Some models can also measure alternating current, capacitance, inductance, and certain parameters of semiconductors (such as β). 1. Structure of … Read more
PLC (Programmable Logic Controller) programming is one of the core skills in the field of industrial automation. For beginners, mastering the basic logic of programming and gradually accumulating experience is key to improving programming skills. This article will start with the simplest momentary control and gradually introduce basic programs such as self-locking and interlocking, helping … Read more
The relationship between PLC and inverter is one of inclusion, where both can execute specific commands to control electric motors. The PLC is a programmable hardware for executing programs, while the inverter is one of the devices it can control. However, the PLC’s scope is broader than that of the inverter, enabling it to control … Read more
Click the blue text above to follow us Hello Dear students Our Dou Classroom is back ~ Welcome to this episode So this is how to measure AC and DC voltage with a pointer multimeter! If you can’t watch the video for now, don’t worry! The complete wiring connection steps are right below Want to … Read more
A multimeter, also known as a multi-tester or volt/ohm meter, is a multifunctional, multi-range measuring instrument. It is the most basic tool in the field of electronic testing and is widely used; it is a measuring tool that personnel in the electronics industry must master. Multimeters are divided into pointer and digital types. A typical … Read more
A multimeter is a common measuring instrument for voltage, resistance, capacitance, temperature, and more. The digital multimeter is easy to operate, rich in functions, and the display screen directly shows the required measurements for DC voltage, AC voltage, DC current, AC current, resistance, capacitance, etc. Today, we will take the clamp multimeter as an example … Read more
A multimeter is an instrument that can measure various parameters, such as alternating current (AC) or direct current (DC) voltage, AC or DC current, resistance, temperature, capacitance, and more. Modern digital multimeters have adopted digital and logic technologies, becoming smaller in size and featuring more built-in functions. By introducing digital technology, digital multimeters can provide … Read more
This article provides a preliminary understanding of the field of information security. 1. Briefly describe security attacks, security mechanisms, and security services. Security attack: Any act that jeopardizes the security of an information system. Security mechanism: A process used to detect, prevent attacks, or recover from an attack state to a normal state. Security service … Read more
Lai Ruiqiang (Quanzhou Huaguang Vocational College, Quanzhou, Fujian 362121) Abstract: With the continuous development of smart campuses, the access control system of school computer rooms is also gradually becoming intelligent. This article designs an access control system for computer rooms using NB-IoT technology. The access control system is mainly controlled by Arduino Mega2560 Pro, and … Read more