Internet of things

(Super detailed 2) Detailed explanation of onenet data visualization, how to draw using intercepted data flow

05/02/2024 IOT 0

Table of contents Preface Hardware setup onenet platform preparation Data flow import Dashboard program segment (get the last set of data uploaded) curve snippet Notice Preface In the previous article, we used sensors to connect to the onenet platform and upload the collected data in real time. When we turn on the device, open the data stream and look at the rows of data being refreshed, is there ... »

Huawei Cloud IOT Android application development detailed tutorial

02/02/2024 Huawei Cloud 0

Huawei CloudIOT AndroidDetailed tutorial on application development （Android Studiodevelopment) Chapter 0Introduction       Hello everyone, the tutorial released in the last issue tells you how to use the official Java Demo provided by Huawei Cloud IoT platform to write Java host computer programs. Since it mainly uses GET requests to query device shadows and query devices, we have received many r... »

ESP-IDF tutorial for ESP32 (15) – Use internal Flash to store files

29/01/2024 IOT 0

Main textFrom the original column “ESP32 Teaching Column (Based on ESP-IDF)”, explain how to use ESP-IDF to build ESP32 programs, publish articles andWe will continue to add new content to published articles! Every article has been carefully polished! ↓↓↓Enter the column directory page through the dialog box below↓↓↓ Request to enter directory_ O xWhether to enter ESP32 teachingnavigat... »

Introduction to Bluetooth (6): Bluetooth Low Energy Information Interaction

28/01/2024 Interaction 0

Article directory PrefaceTHREE-WIRE UART TRANSPORT LAYERLINK ESTABLISHMENTUnInitialized STATEInitialized STATEActive STATE LOW POWERHCI DATA FORMATSData and parameter formatsID and HandleExchange of HCI-specific informationHCI Command packetHCI ACL Data packetsHCI Synchronous Data packetsHCI Event packetHCI ISO Data packets references Preface The Bluetooth protocol stack and the Bluetooth chip all... »

Hongmeng OS2.0 device development Hi3861-basic function summary

24/01/2024 Harmonyos 0

Hi3861-GPIO basic function implementation summary 1.Basic IO functions1.1 Output1.2 Input1.3 System delay 2.PWM output2.1 Common APIs for PWMIoTPwmStart() defined in iot_pwm.h;hi_pwm_start() defined in hi_pwm.h; 2.2 How to control the steering gear 3.ADC implementation3.1 ADC common APIs3.2 Precautions for using ADC 4. Driver i2c4.1 i2c API4.2 i2c usage tips Summary5. Demonstration cases and their... »

OpenHarmony standard equipment application development (3) – distributed data management

17/01/2024 Harmonyos 0

(The following content is shared by developers and does not represent the views of the OpenHarmony Project Group Working Committee) Xing Lu   In the previous chapter, we used distributed music players, distributed bombs, and distributed shopping carts to explain how related controls are used in the layout of OpenAtom OpenHarmony (hereinafter referred to as “OpenHarmony”), and how to im... »

[001] [ESP32 Development Notes] IDF project creation and CMake configuration

15/01/2024 IOT 0

Chip model:ESP32-S2-MINI-1Development environment: VS Code + ESP-IDF plug-in 1 Project creation In VS Code click View – Command Panel (orCtrl+Shift+P） entershow examples projects then clickUse current ESP-ID Choose a routine (e.g.blink), clickCreate project using example blink Select a folder to store the project (There cannot be Chinese paths and spaces） In the SDKblinkAs a template, a new ... »

My NBIOT learning – BC35-G uses AT commands to connect to Huawei Cloud through CoAP protocol

12/01/2024 Huawei Cloud 0

1. First create products and equipment on the Huawei Cloud IoT platform I won’t go into details about model definition and plug-in development.   Note: I tried using the non-encrypted method, but could not connect; if I chose the encrypted registration method, I could connect. Note: NBIOT’s key (PSK) only supports 32 hexadecimal numbers (0-f). For example: a22aaa699997ff90fbc1ac89aab94a99 2. Use A... »

STM32+ESP8266+MQTT connects to Alibaba Cloud server (3. AT command connects to Alibaba Cloud platform)

08/01/2024 IOT 0

Preparation:1. Check the device certificate and prepare for subsequent connections. 2. Use Alibaba Cloud configuration tool to generate device information and client ID Alibaba Cloud IoT Platform Configuration ToolExtraction code: oxq9(1) Paste the triplet information of your device certificate into the corresponding text box and click to generate client ID, username and password (2) Connect to Al... »

LeetCode Greedy Algorithm 1005. Maximized array sum after K times inversion

02/01/2024 Greedy 0

Title address: https://leetcode-cn.com/problems/maximize-sum-of-array-after-k-negations/Given an array A of integers, we can only modify the array in the following way: we pick some index i and replace A[i] with -A[i], and repeat in totalThis process is performed K times. (We can select the same index i multiple times.)After modifying the array in this way, the largest possible sum of the array is... »

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