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Explanation of common sensors IV - water sensor Specific explanation The sensor operates by using a series of five bare wires connected to system ground. Insert one sensing trace, five grounding traces and a total of five sensing traces alternately between each two grounding traces. The sense cable is connected to a 1 megohm pull-up resisto ...

In fact, this thing is OK, but there is no technical support. There will be holes in many details. It took me more than ten days (during which I also spent a week learning welding) to fully succeed. During this period, I was very angry. I thought I bought a piece of garbage and even wanted to throw away this 2 yuan thing. So I bought another on ...

1, First, create a product and a device on OneNet 1. Create MQTT products Step 1: Step 2: Step 3: After clicking OK: 2. Add device to product Step 1: Step 2: Step 3: after creation, you can view the ID and Key of the device. 3. Create data flow for device Step 1: Step 2: Step 3: 2, Test MQTT using MQTT software provided by ...

1, The library we use 1. Brief introduction to Library Library Download Link(github) TFT_eSPI TFT_eSPI supports various commonly used driver chips, such as ST7735, ST7789, ILI9341, etc., with good compatibility 2. About library installation The first way is to search for TFTs in Arduino's library manager_ ESPI, and then click Install ...

1, MQTT protocol 1. MQTT protocol can provide real-time and reliable message service for connecting remote devices with very little code and limited bandwidth. 2. Use publish / subscribe message mode to provide one to many message publishing and decouple applications. Message transmission that masks the payload content. Use TCP/IP to provide ...

As the last article in this series, here's how Arduino simulates USB devices, such as keyboard and mouse. For example, if you do hardware plug-ins, you can use the functions provided by Arduino here. Keyboard First, let's take a look at a section of chestnuts provided in Arduino Chinese community 1 VCC 5V is connected in series with a 1 ...

  reference material: https://www.arduino.cn/thread-2423-1-1.html   1. Required materials Rotary encoder (KY-040) Arduino UNO development board LCD character dot matrix 1602 Potentiometer 10k Bread board 2. How does the connecting wire rotary encoder work? Rotary encoder is an electromechanical transducer, which means that it converts mecha ...

ESP822 chip is a development board that can be used as both server and client. When ESP8266 is selected as the client, you can connect to WIFI for network request. After the network is configured, you can use https to request related API s. First show the results: As shown in the figure above, it is 22:41 on December 15 Step 1: drive nixie ...

Welcome to the world of Arduino Hello, related netizens. Since you want to learn Arduino, I hope you have some C language foundation and basic circuit foundation. Arduino is an open source electronic platform; Arduino includes hardware and software. The hardware part is the development board, and the software part is the compiler. Common b ...

catalogue preface 1, Preparation tools 2, Construction of Baidu Tiangong Internet of things platform 3, Construction and code of Arduino IDE environment 4, Construction and code of wechat applet preface Based on MQTT protocol, with the help of Baidu Tiangong Internet of things platform and Arduino IDE burning program, wec ...