cheapest esp8266

The NODEMCU is a compact development board with integrated WiFi and MCU, based on the ESP8266 chip. Forum in http://bbs.nodemcu.com/, source code in HTTPS://GITHUB.COM/NODEMCU.Using the Openscad to make a shell, you can use the 3D printer output, and no longer "bare-Ben".OPENSCAD's original model file is as follows, which can be modified and output on the 3D printer itself.NODEMCU Smart Device, box, Rainproof (vertical mount)//author:[emailprotected],

don't add this resistor. When connecting, of course, all power is turned off. On the relay control side, the 3.3v,gnd of the BBB is connected to the gnd,in signal of the BBB to connect the BBB p9_13 (GPIO number 31). Note, however, that the circuit connection on the other side of the relay must be followed by the manufacturer's instructions. In general, the middle of the relay is connected to the FireWire (positive), the other two ports are normally open negative and normally closed negative.

Android connects to the server Socket and androidsocket Package com. example. esp8266;Import java. io. IOException;Import java. io. InputStream;Import java. io. OutputStream;Import java. io. PrintStream;Import java.net. Socket;Import android. app. Activity;Import android. OS. Bundle;Import android. OS. Handler;Import android. OS. Message;Import android. view. View;Import android. widget. Button;Import android. widget. EditText;Import android. widget.

interface on the basis of stm32f405 MCU. The board contains 4 LEDs, an acceleration sensor, which can operate at voltages between the 3v-10v.　　The only Micropython development Board that supports the communication positioning functionTPYBoardv702, the only Micropython Development Board that supports the communication positioning function. Support Beidou gps Dual-mode positioning, GPRS communication, SMS, Bluetooth, telephone and other functions. Board load Force sensing, temperature and humidit

/debian Vivid main 'sudo add-apt-repository ' deb Http://ppa.launchpad.net/ubuntugis/ubuntugis-unstable/ubuntu Vivid main '#注意: Vivid is the Ubuntu15.04 version number code, if it is other, it needs to be modified accordingly.#然后, add the source authentication code:GPG--keyserver keyserver.ubuntu.com--recv dd45f6c3GPG--export--armor dd45f6c3 | sudo apt-key add-#最后, perform the installation operation.sudo apt-get updatesudo apt-get install Qgis Python-qgis qgis-plugin-grass#大功告成, go to the consol

Arduino MQ135 Gas Sensor first, the wiring The MQ135 has 4 pins, VCC, GND, A0, D0, respectively, where VCC, GND, and A0 are required. The following diagram is a esp8266 wiring diagram. Due to the measurement of the gas value of PPM, it is related to the air temperature and humidity. So we've added a DHT22 here. DHT22 Portal vcc->3v Gnd->g A0->a0 Second, MQ135 library Download Address: https://github.com/zhao007z4/MQ135 After the download is complete,

Welcome to the Oracle community forum and interact with 2 million technical staff. What is Oracle's policy for Linux? Oracle fully supports the Linux operating system. In fact, Oracle is the first commercial database for Linux. By using Oracle's industry-leading products to support Linux, we can make users in the cheapest Welcome to the Oracle community forum and interact with 2 million technicians> what is the Oracle policy for Linux? Oracle fully su

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When talking about database performance optimization, we usually mention "indexes". However, many people do not really understand indexes, and do not know why indexes can speed up retrieval, so that indexes cannot be applied well in practice. In fact, the index can be said to be the cheapest and very effective optimization method. In general, the design of excellent indexes for query When talking about database performance optimization, we usually men

The toll! RevisitedSindbad the Sailor sold the silver spoons to the Sultan of Samarkand. The selling is quite easy; But delivering was complicated. The items were transported over land, passing through several towns and villages. Village demanded an entry toll. There were no tolls for leaving. The toll for entering a village is simply one item. The toll for entering a town is one piece per items carried. For example, to-enter a town carrying items, you had to pay 4 items as toll. The towns and v

1. Design TopicsBookstore for the "Harry Potter" series of books for promotional activities, a total of 5 volumes, with numbers 0, 1, 2, 3, 4, a single volume of 8 yuan, the specific discount is as follows:Discount on this number2 5%3 10%4 20%5 25%2. Design RequirementsDepending on the number of volumes purchased and this number, different discount rules will be applicable. The singular book only corresponds to one discount rule, for example, two volume 1, one volume 2, you can enjoy 5% discount

villages, you must start WI Th spoons. Figure 2:the Best route to reach X with The spoons, starting from A, is a->b->c->x , shown with arrows in the and the left. The best route to reach X with ten spoons is a->d->x, and the shown in the. The figures display towns as squares and villages as circles. Predicting the tolls charged in each village or town was qu

Problem ITeen girl squadInput:Standard Input Output:Standard output -- 3 spring rolls please.-- MSG 'd !!-- Oh! My stomach lining! Strong bad You are part of a groupNTeenage girls armed with cellphones. you have some news you want to tell everyone in the group. the problem is that no two of you are in the same room, and you must communicate using only cellphones. what's worse is that due to excessive usage, your parents have refused to pay your cellphone bills, so you must distri

Teen girl squadInput:Standard Input Output:Standard output You are part of a groupNTeenage girls armed with cellphones. you have some news you want to tell everyone in the group. the problem is that no two of you are in the same room, and you must communicate using only cellphones. what's worse is that due to excessive usage, your parents have refused to pay your cellphone bills, so you must distribute the news by calling each other in the cheapest po

. This head is plastic, and some people think it is the most cost-effective Nikon lens, features, cutting-edge, cheap, affordable, wide angle end has a common problem of the Nikon 18mm series DX head, large distortion. The second one I introduced is AF-S DX VR 55-200mm f/4-5.6G IF-ED, which is the latest release of Nikon, the cheapest Nikon zoom lens with VR, plastic, the MTF Curve is perfect, and the actual performance has not been described yet. Abo

Secure Transmission needs to be considered for a system developed by the website recently. This article will be added to favorites and may be used in the future. ---------------- Cool SPLIT line --------------- By qyb As far as I can see, the vast majority of Chinese websites do not provide https encrypted transmission, which is not commensurate with the development level of China's Internet. Here, I will share my experience and experience in purchasing an SSL certificate here, hoping to help an

1.GherkinIntroduction: Cucumber is an interpreter. Just like the ruby code in the. rb file, Cucumber is used to execute the Gehrkin code in the. feature file. 2.Keywords: When writing a feature file, you will use a lot of specific keywords in the Gherkin language, mainly including the following: • Feature • Background • Scenario • Scenario outline • Scenarios (or examples) • Given • When • Then • And (or) • | (Used to define a table) • "" (Defining multi-line strings) • # (Comment) We can write

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bill system will be officially launched as soon as his salary is calculated. In addition, there was a major accident in a translation project. It was very troublesome to find all the relevant documents in various emails. The boss attaches great importance to this system because, unless the project ends, he will not be able to see the immediate progress of the company's projects. Zhang Xiaoqing understands the reasons why the system is divided into four parts: translation process and task alloca

ordering by price. Figure 14: Removing the SortExpression attribute, the user can no longer sort by product price Programmatic sort GridView We can also use the GridView Sort method to programmatically sort the contents of the GridView. You only need to pass in SortExpression and SortDirection (ascending or descending). We turned off the UnitPrice sort of thinking that we don't want users to buy only the cheapest things. However, we want to enc