Practical Task:There are three motors that need to be started sequentially with a 10-minute interval. Each motor runs for 2 hours before automatically stopping. There is a stop button that can halt the operation of all motors. Write a PLC program.Steps:1. Assign I/OStart X0; Stop X1; Motor A uses Y0; Motor B uses Y1; Motor … Read more
Want to create anall-weather, completely wireless, almost “zero standby power” weather board? This project has paved the way: ESP32-S3 + tri-color E-Ink display + solar energy harvesting + hardware timed power on. The target form is to be attached by the window, charging the battery with sunlight during the day, periodically connecting to the internet … Read more
eBPF Timers v5.15 Timers allow eBPF programs to schedule the execution of an eBPF function at a later time. Use cases for this functionality include garbage collection of mapping values or performing periodic checks. For example, if the TTL (Time to Live) of a DNS record has expired, we may want to remove those records … Read more
1.Principles of Linux Kernel Timers 1.1Kernel Time Management 1.The Cortex-M kernel uses systick as the system timer. 2.Hardware timers and software timers rely on the system timer for operation. 3.The frequency of the Linux kernel can be configured through a graphical interface. By opening the .config file in the root directory of the Linux kernel … Read more
(In the control room of a food factory’s packaging line, Xiao A frowns at the ladder diagram on the PLC programming software, noticing that the counting function of the packaging machine is always inaccurate, with the number of cookie packages counted per hour being consistently less by more than 10 packages. Engineer Zhang approaches with … Read more
Mitsubishi PLC Fundamentals of Applications 1. Common Series of Mitsubishi PLC 1. FX Series Features: Compact, economical, suitable for simple control (e.g., FX3U, FX5U). Applications: Small equipment, assembly line control, simple logic control. 2. Q Series Features: Modular design, strong expandability, suitable for complex systems. Applications: Large production lines, multi-axis motion control, networked systems. 3. … Read more
For engineers who have been exposed to PLC programming, concepts such as self-locking, interlocking, and mutual locking are certainly familiar. These are typical foundational elements in PLC programming and are core skills that must be mastered. Next, we will introduce several classic small program examples. 1. Self-Locking (Start-Stop Control) The PLC control circuit for self-locking … Read more
In embedded development, precise delay control is crucial for many applications, especially in scenarios such as sensor sampling and protocol timing control. Traditional methods of implementing delays often rely on simple for loops; however, this approach not only lacks precision but also wastes a significant amount of CPU resources during long delays. To improve delay … Read more