Circuit Troubleshooting

Understanding the Microcontroller Startup Process (STM32) for Hardware Engineers, Including a Troubleshooting Manual for Startup Issues

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Understanding the Microcontroller Startup Process (STM32) for Hardware Engineers, Including a Troubleshooting Manual for Startup Issues

As a hardware engineer, have you ever encountered these issues: The circuit board shows no response after power is applied, like a “brick”. The program occasionally starts, but sometimes hangs. Peripheral initialization is abnormal, yet the code logic is correct. These issues stem from startup process anomalies 80% of the time! Let’s learn about the … Read more

Steps for Troubleshooting PLC Failures

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Steps for Troubleshooting PLC Failures

The troubleshooting steps for a PLC (Programmable Logic Controller) typically follow a systematic and detailed process to ensure accurate and efficient identification and resolution of faults. Below is a comprehensive guide to PLC troubleshooting steps: 1. Preliminary Observation and Assessment 1. Observe Appearance and Indicator Lights: ● Check the PLC device for any visible physical … Read more

Practical Recovery of Linux GRUB

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Practical Recovery of Linux GRUB

#Linux #GRUB Practical RecoveryFault Phenomenon and Root Cause Analysis After a system upgrade or unexpected power outage, the following prompt appears on boot: error: symbol 'grub_is_lockdown' not found. Entering rescue mode… grub rescue> This issue is common in Debian/Ubuntu system upgrade scenarios and is essentially a compatibility problem with the GRUB package or file corruption. … Read more

Common Pitfalls for ESP32 Beginners

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Common Pitfalls for ESP32 Beginners

When I was developing products, I used to scoff at the ESP32, thinking it was just a toy, lacking reliability, ease of use, and anti-interference capabilities for actual products. However, later on, when some of Xiaomi’s smart home products began to adopt it in large quantities, my perspective changed slightly. Nevertheless, I still wouldn’t use … Read more

How to Diagnose PROFIBUS Communication Failures? A Systematic Approach to Troubleshooting Fieldbus Connection Issues and Tool Usage!

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How to Diagnose PROFIBUS Communication Failures? A Systematic Approach to Troubleshooting Fieldbus Connection Issues and Tool Usage!

How to Diagnose PROFIBUS Communication Failures? A Systematic Approach to Troubleshooting Fieldbus Connection Issues and Tool Usage! Hello everyone! Today I want to share a “nightmare” in the field of industrial automation—the methods for diagnosing PROFIBUS communication failures. In my over ten years of experience in industrial automation projects, PROFIBUS failures are one of the … Read more

How to Find Drivers for Unknown Devices in Device Manager

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How to Find Drivers for Unknown Devices in Device Manager

After installing Windows, you may find one or more unknown devices with exclamation marks in Device Manager. Even if they have names like PCI Memory Controller, PCI Data Acquisition and Signal Processing Controller, SM Bus Controller, etc., as long as there is an exclamation mark in front, it indicates that the driver is not installed … Read more

A Comprehensive Guide to Linux Hardware Information and Troubleshooting Commands

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A Comprehensive Guide to Linux Hardware Information and Troubleshooting Commands

Today, I will share some hardware-related commands that can be used for daily operations and troubleshooting. Quick Reference Table for Hardware Commands Function Command CPU Information lscpu / cat /proc/cpuinfo Memory free -h / dmidecode -t memory Disk lsblk / fdisk -l / smartctl PCI Devices lspci USB Devices lsusb Motherboard Information dmidecode Temperature Monitoring … Read more

How to Troubleshoot Network Packet Loss in Linux? Finally Understood!

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How to Troubleshoot Network Packet Loss in Linux? Finally Understood!

1. Background: From the image, you can see the potential locations where packet loss may occur, which actually spans the entire network protocol stack. In other words, there is a possibility of packet loss at every stage. • Between two VMs, transmission failures may occur due to errors such as network congestion or line faults; … Read more

Flashing the Allwinner H3 Chip: A Comprehensive Guide

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Flashing the Allwinner H3 Chip: A Comprehensive Guide

★ In the information age, most electronic products require system support to operate perfectly. However, there are times when these systems may malfunction, such as failing to boot. If you don’t know how to flash the firmware, it can be quite frustrating. This tutorial will teach you how to flash the firmware to resolve such … Read more

Mounting SMB on OpenWrt

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Mounting SMB on OpenWrt

Add UserDependenciesopkg install shadow-commonopkg install shadow-useraddAdd SMB Specific Useruseradd YOUR_SMB_USER_NAMEAssociate User with SMB Servicesmbpasswd -a YOUR_SMB_USER_NAMEOpenWrt ConfigurationMount SMB Network ShareHere, fill in the SMB storage information to be mounted on OpenWrt, and you will see the successfully mounted drive at the OpenWrt mount point.Network ShareHere, set up the SMB service on OpenWrt, which means sharing … Read more