Explanation of common sensors IV - water sensor
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 ...
Posted by silverglade on Fri, 18 Feb 2022 20:24:45 +0100
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 ...
Posted by FillePille on Thu, 17 Feb 2022 11:01:54 +0100
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 ...
Posted by craigh on Thu, 10 Feb 2022 15:23:22 +0100
1, The library we use
1. Brief introduction to Library
Library Download Link(github)
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 ...
Posted by medaswho on Fri, 04 Feb 2022 07:08:54 +0100
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 ...
Posted by urbansmooth on Sun, 23 Jan 2022 20:01:12 +0100
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.
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 ...
Posted by Rick Corbett on Fri, 21 Jan 2022 21:53:36 +0100
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
2. How does the connecting wire rotary encoder work?
Rotary encoder is an electromechanical transducer, which means that it converts mecha ...
Posted by chelsea7 on Sun, 16 Jan 2022 07:01:53 +0100
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 ...
Posted by endurox on Wed, 05 Jan 2022 13:04:18 +0100
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 ...
Posted by hermzz on Wed, 22 Dec 2021 20:34:26 +0100
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
Based on MQTT protocol, with the help of Baidu Tiangong Internet of things platform and Arduino IDE burning program, wec ...
Posted by tommy1987 on Mon, 20 Dec 2021 01:26:54 +0100