学院宣传网站制作,网站开发者模式下怎么保存图片,做印刷去哪个网站找工作,优化算法ESP32/ESP8266开发板单向一对多ESP-NOW无线通信 简介读取ESP32/ESP8266接收方Receiver的MAC地址ESP32/ESP8266发送方Sender程序ESP32/ESP8266接收方Receiver程序ESP-NOW通信验证总结 简介
本实验通过ESP-NOW无线通信协议实现多个ESP32/ESP 8266开发板向ESP32开发板发送数据。例… ESP32/ESP8266开发板单向一对多ESP-NOW无线通信 简介读取ESP32/ESP8266接收方Receiver的MAC地址ESP32/ESP8266发送方Sender程序ESP32/ESP8266接收方Receiver程序ESP-NOW通信验证总结 简介
本实验通过ESP-NOW无线通信协议实现多个ESP32/ESP 8266开发板向ESP32开发板发送数据。例如可以应用于从多个远程传感器上收集数据。
读取ESP32/ESP8266接收方Receiver的MAC地址
读取ESP32开发板的代码
#ifdef ESP32#include WiFi.h#include esp_wifi.h
#else#include ESP8266WiFi.h
#endifvoid setup(){Serial.begin(115200);Serial.print(ESP Board MAC Address: );#ifdef ESP32WiFi.mode(WIFI_STA);WiFi.STA.begin();uint8_t baseMac[6];esp_err_t ret esp_wifi_get_mac(WIFI_IF_STA, baseMac);if (ret ESP_OK) {Serial.printf(%02x:%02x:%02x:%02x:%02x:%02x\n,baseMac[0], baseMac[1], baseMac[2],baseMac[3], baseMac[4], baseMac[5]);} else {Serial.println(Failed to read MAC address);}#elseSerial.println(WiFi.macAddress());#endif
}void loop(){}通过串口打印读取到接收方ESP32开发板1的MAC地址为54:43:b2:7f:00:60
ESP32/ESP8266发送方Sender程序
把读取到的接收方的MAC地址填入到uint8_t broadcastAddress[]数组中并修改结构体的中myData.id的值ESP32开发板1程序中填入myData.id 1ESP32开发板2程序中填入myData.id 2ESP32开发板3程序中填入myData.id 3接收方以此来分辨是哪一个ESP32开发板发过来的数据。
#include esp_now.h
#include WiFi.h// REPLACE WITH THE RECEIVERS MAC Address
uint8_t broadcastAddress[] {0x54, 0x43, 0xb2, 0x7f, 0x00, 0x60};// Structure example to send data
// Must match the receiver structure
typedef struct struct_message {int id; // must be unique for each sender boardint x;int y;
} struct_message;// Create a struct_message called myData
struct_message myData;// Create peer interface
esp_now_peer_info_t peerInfo;// callback when data is sent
void OnDataSent(const uint8_t *mac_addr, esp_now_send_status_t status) {Serial.print(\r\nLast Packet Send Status:\t);Serial.println(status ESP_NOW_SEND_SUCCESS ? Delivery Success : Delivery Fail);
}void setup() {// Init Serial MonitorSerial.begin(115200);// Set device as a Wi-Fi StationWiFi.mode(WIFI_STA);// Init ESP-NOWif (esp_now_init() ! ESP_OK) {Serial.println(Error initializing ESP-NOW);return;}// Once ESPNow is successfully Init, we will register for Send CB to// get the status of Trasnmitted packetesp_now_register_send_cb(OnDataSent);// Register peermemcpy(peerInfo.peer_addr, broadcastAddress, 6);peerInfo.channel 0; peerInfo.encrypt false;// Add peer if (esp_now_add_peer(peerInfo) ! ESP_OK){Serial.println(Failed to add peer);return;}
}void loop() {// Set values to sendmyData.id 1;myData.x random(0,50);myData.y random(0,50);// Send message via ESP-NOWesp_err_t result esp_now_send(broadcastAddress, (uint8_t *) myData, sizeof(myData));if (result ESP_OK) {Serial.println(Sent with success);}else {Serial.println(Error sending the data);}delay(10000);
}ESP32/ESP8266接收方Receiver程序
#include esp_now.h
#include WiFi.h// Structure example to receive data
// Must match the sender structure
typedef struct struct_message {int id;int x;int y;
}struct_message;// Create a struct_message called myData
struct_message myData;// Create a structure to hold the readings from each board
struct_message board1;
struct_message board2;
struct_message board3;// Create an array with all the structures
struct_message boardsStruct[3] {board1, board2, board3};// callback function that will be executed when data is received
void OnDataRecv(const uint8_t * mac_addr, const uint8_t *incomingData, int len) {char macStr[18];Serial.print(Packet received from: );snprintf(macStr, sizeof(macStr), %02x:%02x:%02x:%02x:%02x:%02x,mac_addr[0], mac_addr[1], mac_addr[2], mac_addr[3], mac_addr[4], mac_addr[5]);Serial.println(macStr);memcpy(myData, incomingData, sizeof(myData));Serial.printf(Board ID %u: %u bytes\n, myData.id, len);// Update the structures with the new incoming databoardsStruct[myData.id-1].x myData.x;boardsStruct[myData.id-1].y myData.y;Serial.printf(x value: %d \n, boardsStruct[myData.id-1].x);Serial.printf(y value: %d \n, boardsStruct[myData.id-1].y);Serial.println();
}void setup() {//Initialize Serial MonitorSerial.begin(115200);//Set device as a Wi-Fi StationWiFi.mode(WIFI_STA);//Init ESP-NOWif (esp_now_init() ! ESP_OK) {Serial.println(Error initializing ESP-NOW);return;}// Once ESPNow is successfully Init, we will register for recv CB to// get recv packer infoesp_now_register_recv_cb(esp_now_recv_cb_t(OnDataRecv));
}void loop() {// Acess the variables for each board/*int board1X boardsStruct[0].x;int board1Y boardsStruct[0].y;int board2X boardsStruct[1].x;int board2Y boardsStruct[1].y;int board3X boardsStruct[2].x;int board3Y boardsStruct[2].y;*/delay(10000);
}ESP-NOW通信验证 分别给左边的3个ESP32开发板下载好发送方Sender程序给右边的ESP32开发板下载好接收方Receiver程序 若接收方接收到数据串口会打印出接收到对应的ESP32开发板的ID号和ESP32开发板的两个随机数 若发送方数据发送成功串口会打印出数据发送完成数据接收成功 若发送方数据发送成功串口会打印出数据发送完成数据接收失败
总结
通过以上例程验证了ESP32开发板之间单向多对一的ESP-NOW无线通信。
