01 Introduction This PWM 360 motor is controlled by PWM signals. Compared to ordinary DC motors, it can control the rotation speed without additional drivers, has high torque, and features stall protection, but its rotation speed is not as fast. 02 Principle The introduction and usage of PWM principles can be referenced in my previous … Read more
Optimizing the RF front end of the SI4732 chip receiver, ESP32 microcontroller and display, large speaker, audio system, and battery Building the SWL Chimera Author: Sam (WN5C) Imagine this: a cool July night on the north shore of Lake Huron, the water gently lapping at the beach. Your feet warmed by the campfire, the sky … Read more
When you want to achieve remote desktop monitoring at a low cost, traditional solutions either rely on expensive Raspberry Pi or are limited by the rudimentary interfaces of microcontrollers.Now, ArduinoVNC — it transforms low-cost development boards like ESP8266/ESP32 into VNC clients, allowing small screens to display remote computer desktops for just a few dozen yuan … Read more
Detailed Explanation of Fault Injection (Part 1) Bypassing Secure Boot One of the security measures that can be compromised through fault injection attacks is secure boot. This will be illustrated using the ESP32 v1 as an example. First, configure a secure boot environment. After installing the ESP SDK, set up a reprogrammable bootloader in case … Read more
Introduction Today, the ESP32-S3 development board I ordered online has arrived, and I can’t wait to open it and give it a try. What is a Development Board: Typically, the programs we write run on servers, personal computers, or mobile devices. Whether it’s a server, personal computer, tablet, smartphone, Raspberry Pi, ESP32, STM32, etc., they … Read more
When you are still struggling with the “while(1)” loop in microcontroller programming, the absence of a Real-Time Operating System (RTOS) has become the biggest obstacle to advancing your project. The ESP32-freeRTOS open-source project provides over 20 practical examples, allowing you to easily implement task scheduling, resource synchronization, and interrupt management in C, completely bidding farewell … Read more
01 Introduction This 270-degree servo is controlled by PWM signals to adjust the rotation angle (0 to 270 degrees), capable ofinstantaneously completing angle changes, with good explosive force and strong stall torque. This article will first discuss analog and digital signals, then introduce what PWM is, and finally demonstrate how to wire and program the … Read more
I haven’t been paying much attention to the DIY community lately, but today I checked out Xianyu and found many new and interesting gadgets. Previously, I wrote about five AI robots based on ESP32 boards, which were generally quite large. This one is much smaller and requires a higher level of integration.Compared to the previous … Read more
1. What is GPIO? GPIO (General Purpose Input Output) refers to “general-purpose input/output ports,” which are pins that can be flexibly configured as input or output through software. Typical applications in embedded development include: Controlling output devices such as LED lights, relays, and buzzers Detecting input devices such as buttons and dip switches Interacting with … Read more
During the firmware upgrade process of the ESP32, the HTTPS transmission rate often becomes a key factor limiting upgrade efficiency. Based on actual test data, traditional HTTPS upgrade methods exhibit the following typical issues: • Slow transmission rate: A 1MB firmware takes about 90 seconds • High memory usage: The SSL handshake and encryption/decryption processes … Read more