Recently, a project wanted to monitor the abnormal situation of an object on the construction site. This kind of thing should be able to stand by for 20 ~ 30 days with a 3.7V battery. Under normal circumstances, it is almost in a static state, and there will be a little vibration due to nearby interference. When there is a large movement, it sh ...
Posted on Fri, 03 Dec 2021 21:24:00 -0500 by craige
Introduction to network programming
Fundamentals of computer network
Computer network is the general name of the system formed by the interconnection of independent computers. The main purpose of establishing computer network is to realize the communication and resource sharing among multiple computers. Today, there are countless devices and ...
Posted on Tue, 30 Nov 2021 08:48:08 -0500 by demon_athens
This article shares the official account of OneOS WeChat public. Positioning function evaluation + development details>.
In order to show you
OnePos location service capabilities
Reproduction of subway track
Took the subway for most of the day
You must see this video
Click this jump demo video
A small p ...
Posted on Mon, 29 Nov 2021 10:25:24 -0500 by greensweater
When winter comes, I wake up in the morning and don't bother to get out of bed, but for everyone's sake, I still resist the cold and risk my life to prepare this issue of articles for you. I wonder if this is worth your praise o(´ ^ ') O. of course, after so long, I know you won't praise it if you don't see the goods. I'd better ...
Posted on Fri, 26 Nov 2021 02:08:07 -0500 by mjlogan
[this article is participating in the "2021 Aizhi Pioneer - Essay Contest"] https://mp.weixin.qq.com/s/I2...prefaceTwo sensors were made before 2021 Aizhi Pioneer - human presence sensor - CSDN community and DIY smart home from scratch - intelligent light sensor based on ESP32_ Inspired desktop blog - CSDN blog As a result, control th ...
Posted on Fri, 26 Nov 2021 01:10:18 -0500 by phynias
In August 2017, OASIS MQTT Technical Committee officially released the for Public Review MQTT 5.0 Draft of. In 2018, MQTT 5.0 was officially released. However, until now, there is still no client SDK fully supporting MQTT 5.0 in Apple ecosystem.CocoaMQTT It is the MQTT CLIENT SDK provided by EMQ team for iOS developers. At present, it is widely ...
Posted on Wed, 24 Nov 2021 09:57:52 -0500 by duall
1. EC20 module connection
For embedded Linux, 4G network connection is an easy function to realize. Most 4G module interfaces are MiniPCIE interfaces. After a deep understanding, it will be found that the communication interface of 4G module is USB, so the driver of 4G module often uses USB driver. As long as the USB driver is normal, the ...
Posted on Tue, 23 Nov 2021 19:57:46 -0500 by Jumba
[this article is participating in the "2021 Aizhi Pioneer - Essay Contest"] https://mp.weixin.qq.com/s/I2s99dZpbP0QpMiKFneYJA
Two sensors were made before 2021 Aizhi Pioneer - human presence sensor - CSDN community and DIY smart home from scratch - intelligent light sensor based on ESP32_ Inspired desktop blog - CSDN blog As ...
Posted on Sun, 21 Nov 2021 20:34:49 -0500 by natefanaro
We know that the internal processing of single-chip computers is such a digital signal as 0,1. If we only use 0,1 to control the speed of the car, this is certainly unrealistic. Engineers think of using the ratio of the power level to the whole cycle to average the output voltage, so that several single voltages become many diffe ...
Posted on Sun, 21 Nov 2021 15:07:37 -0500 by R0CKY
NodeMUC development Lesson1
1. Circuit diagram of development board
GPIO: general I / O pin, corresponding to the pin corresponding to ESP8266 chip (blue in the figure)
ADC: start with a, analog pin
Vin: another way to power NodeMCU
3V3: provide 3.3v voltage for the outside world
Digital pin: as an input, it cannot ...
Posted on Sat, 20 Nov 2021 04:22:00 -0500 by john010117