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After the beginning of summer, the temperature rises gradually. "Heat" is one of the key words of everyone in summer. How to have a cool summer?   "Turn on the air conditioner in summer!", It's cool, but it's cool! The elderly and children at home are more likely to have cold and dizziness symptoms!   "It's really e ...

Linux applications usually have three ways to query whether device drivers can be accessed: blocking, non blocking and asynchronous notification. Asynchronous notification: "signal" came into being. The signal is similar to the "interrupt" used in our hardware, but the signal is at the software level. It can be regarded as ...

Principle of ultrasonic ranging Using sound ranging, the speed of sound in the air is 340m/s(15 ℃) When the sound propagates, it will bounce back if it encounters an obstacle. The distance from the transmitting end to the obstacle can be calculated by counting the rebound time S=v*(t/2) Ultrasonic module instruction In the single chip m ...

Mixed use of various modules (1) Measurement of temperature and humidity;             DHT11 (2) Display of temperature, humidity and other parameters;      LCD screen (3) Setting of alarm data (key);       EXIT interrupt service function (4) Temperature and humidity con ...

The following definitions of relevant API interfaces can be viewed in l Lexin's official website: Wi Fi Library - ESP32 - ESP-IDF programming guide v4 4 documents STA mode configuration process: #include <string.h> #include "freertos/FreeRTOS.h" #include "freertos/task.h" #include "freertos/event_groups.h" #include "esp_system.h" #inclu ...

I preface The s3c2440 equipped with Mini2440 has long been discontinued, but the platform will be outdated and the technology will not be outdated. It still has certain learning significance. Let's give full play to the waste heat of this development board for the last time. The technology involved in U-Boot is bare metal development. In a ...

preface Nowadays, with the rapid development of science and technology, our home has been full of all kinds of household appliances; Among them, the kettle is one of our commonly used household equipment. The traditional kettle has only a simple heating function and can not set the heating temperature or remote control. In view of this si ...

RT-Thread version: 4.0.5 MCU model: STM32F103RCT6 (ARM Cortex-M3 kernel) 1 Synchronization and Mutual Exclusion First add a few concepts: Execution Unit: Determined by the current hardware platform and the operating system it runs. For RT-Thread and STM32, the execution units are threads and interruptsCritical Zone: Multiple execut ...

catalogue 1, CAN module configuration process 1.1 set the baud rate and related working mode of can in the graphical interface 1.2 code setting can filter and interrupt 2, CAN message sending function 3, CAN information receiving function 4, CAN receive callback function 5, Summary The default readers of this article have the following ...

In the previous section, we built templates and created single tasks. In this section, we build multi tasks uCOSIII system transplantation (I) construction of single task Task requirements: build three tasks (two LED s and one BUZ) Refer to the transplantation of wildfire. (my board is different from wildfire, so I need to make s ...