临沂外贸网站建设,代做毕业设计找哪个网站,wordpress页面上下级,凤岗建设网站ESP32是一款由乐鑫科技#xff08;Espressif Systems#xff09;推出的双核、低功耗、集成Wi-Fi和蓝牙的单芯片微控制器。它采用了Tensilica Xtensa LX6高性能处理器#xff0c;具有大量的GPIO引脚、模数转换器、SPI、I2S、UART、PWM、I2C和SD卡接口等功能#xff0c;可以满…ESP32是一款由乐鑫科技Espressif Systems推出的双核、低功耗、集成Wi-Fi和蓝牙的单芯片微控制器。它采用了Tensilica Xtensa LX6高性能处理器具有大量的GPIO引脚、模数转换器、SPI、I2S、UART、PWM、I2C和SD卡接口等功能可以满足各种物联网IoT应用的需求。由于其高度集成和低功耗特性ESP32广泛应用于智能家居、智能城市、工业自动化、智能健康、车联网等领域。
1.1 准备
软件Arduino IDE 硬件esp32-dev-module
1.2 esp32_Arduino的MQTT库安装
esp32通过MQTT协议连接到物联网平台我们需要一个mqtt client的库帮助我们发布订阅相关的topic。我们还需要一个JSON库帮我们解析JSON用来序列化和反序列化物模型的JSON数据。 在工具管理库中查找PubSubclient、ArduinoJSON和EspMQTTclient并安装。
1.3 MQTT连接腾讯云的相关配置
这里使用腾讯云平台创建物联网公共实例。 (1)填写域名和端口 ${productid}.iotcloud.tencentdevices.com:1883 (2)生成username和password 要注意的是username和password是在连接到云端mqtt broker的时候需要填入的可以通过这个在线工具生成。Hmac签名算法选择【HMAC-SHA1】。 (3)填写订阅和发布的消息可从云平台中获得。 发送的消息指令具体数据格式可通过云端的调试功能发送一条消息进行测试。
1.4 编写代码
#include Arduino.h
#include WiFi.h
#include PubSubClient.h
#include ArduinoJson.h
DynamicJsonDocument doc(1024);const char *ssid climbot;
const char *pwd climbot903B;
const char *mqtt_server E3TGIRQYNA.iotcloud.tencentdevices.com;
const char *mqtt_username E3TGIRQYNA01;12010126;CT9W4;1690882370;
const char *mqtt_userpwd 72b711c5d7f7e1c76cfca1a785fbddfd3f744163;hmacsha1;
const char *mqtt_clientid E3TGIRQYNA01;
const char *mqtt_pub_topic $thing/up/property/E3TGIRQYNA/01;
const char *mqtt_sub_topic $thing/down/property/E3TGIRQYNA/01;bool power_switch;
float longtitude;
float latitude;
int power_percent 0;#define REPORT_DATA_TEMPLATE {\method\:\report\,\clientToken\:\00000001\,\params\:{\power_switch\:%d,\GPS_Info\:{\longtitude\:%f,\latitude\:%f},\_mesh_generic_power_percent\:%d}}WiFiClient espClient;
PubSubClient mqttclient(espClient);
long lastMsg 0;
char report_buf[1024];void callback(char* topic, byte* payload, unsigned int length)
{Serial.print(---Message arrived [);Serial.print(topic);Serial.print(] );Serial.println();Serial.print(payload [);for (int i0;ilength;i) {Serial.print((char)payload[i]);}Serial.println();//处理上位机的控制指令DeserializationError error deserializeJson(doc, payload);// Test if parsing succeeds.if (error) {Serial.print(deserializeJson() failed: );Serial.println(error.f_str());return;}else{if (doc[clientToken]!00000001) {if (doc[params][power_switch] 1) {Serial.print(Power On );power_switch1;} else {Serial.print(Power Off );power_switch0;}}}}void setup_wifi()
{Serial.printf(Connect to %s , ssid);WiFi.begin(ssid, pwd);while (WiFi.status() ! WL_CONNECTED) {Serial.printf(.);delay(500);}Serial.println(Connected!);Serial.print(IP address: );Serial.println(WiFi.localIP());
}void setup() {Serial.begin(115200);setup_wifi();mqttclient.setServer(mqtt_server, 1883);// connect mqtt servermqttclient.setCallback(callback);mqttclient.setKeepAlive(65535);while (!mqttclient.connect(mqtt_clientid, mqtt_username, mqtt_userpwd)) {Serial.println(mqtt connect fail, reconnect);delay(2000);}Serial.println(mqtt connected!);// sub topicboolean ret mqttclient.subscribe(mqtt_sub_topic);if (ret ! true) {Serial.printf(mqtt subscribe topic [%s] fail\n, mqtt_sub_topic);}Serial.printf(mqtt subscribe topic [%s] ok\n, mqtt_sub_topic);
}void loop() {// client loopmqttclient.loop();// pub topiclong now millis();if (now - lastMsg 10000) {lastMsg now;memset(report_buf, 0, 1024);sprintf(report_buf, REPORT_DATA_TEMPLATE, power_switch,longtitude,latitude,power_percent);Serial.println(report_buf);if (power_percent 100) {//模拟传感器数据power_percent 0;}if (longtitude 100) {longtitude 0;}if (latitude 100) {latitude 0;}if (mqttclient.publish(mqtt_pub_topic, report_buf)) {Serial.printf(mqtt publish topic [%s] ok\n, mqtt_pub_topic);} else {Serial.printf(mqtt publish topic [%s] fail\n, mqtt_pub_topic);}}
}1.5 烧录和测试
点击下载按钮待下载完成后打开串口监视器可看到打印的数据。打开腾讯云平台可查看设备在线状态。
