ブロードキャストのサンプルを少しいじって温度の転送(M5NanoC6)(ESP-NOW)



x 過去ログを見よ!!
x パケロスするが気にするな!!
x シリアルがかけるが気にするな!!


おだいの、温度センサー

スイッチサイエンス

![o_coq548.jpg](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/840352/8b7a3786-29f5-c680-0058-431ed0245c41.jpeg)

https://www.switch-science.com/products/806

https://qiita.com/caa45040/items/696505b5da5296bb5176

参考

https://qiita.com/caa45040/items/c4025a0669ad26bf916b

目的
最小限の小改造で温度を無線転送
USBシリアル内蔵のESP32-S3とESP32-C6は、
なぜか、シリアルでこけるので小改造する

改造とは、ichgojam系の小学生が自作ゲームをいじる時に使う言葉

なぜかここでこけるので改造する

```c++


  while (!Serial) {
    delay(10);
  }

```

改造後

```c++


  //while (!Serial) {
  //  delay(10);
  //}

  for(int i=0;i<16;i++){
    Serial.print(".");
    delay(1000);
  }//for
  Serial.println();


```

この後、温度センサー系を合成する

合成とは、新しい攻撃系の魔法を作る時に使う。

元のプログラム

```c++


// Demo code for Grove - Temperature Sensor V1.1/1.2
// Loovee @ 2015-8-26

#include <math.h>

const int B = 4275;               // B value of the thermistor
const int R0 = 100000;            // R0 = 100k

//const int pinTempSensor = A0;     // Grove - Temperature Sensor connect to A0
const int pinTempSensor = 1;     // Grove - Temperature Sensor connect to G1


#if defined(ARDUINO_ARCH_AVR)
#define debug  Serial
#elif defined(ARDUINO_ARCH_SAMD) ||  defined(ARDUINO_ARCH_SAM)
#define debug  SerialUSB
#else
#define debug  Serial
#endif

void setup()
{
    Serial.begin(9600);
}

void loop()
{
    int a = analogRead(pinTempSensor);

    //float R = 1023.0/a-1.0;
    //R = R0*R;
    float R,v1,a1,o1; 
    v1 = ((float)a) * 0.001; //電圧を求める
    a1 = v1 / 100000.0;           //電流を求める
    o1 = 5.0 / a1;                //全体の抵抗を求める
    R = o1 - 100000.0;    //全体の抵抗から検出抵抗を引く

    float temperature = 1.0/(log(R/R0)/B+1/298.15)-273.15; // convert to temperature via datasheet

    Serial.print("temperature = ");
    Serial.println(temperature);

    delay(100);
}


```


基本、わかっているか、わからないけど
M5NanoC6やM5StampS3は、基本、リセットがないから
最初から実行したい時は、抜き差しをして開始させると
シリアルで最初の画面がでるよ(基本)
USBを抜く、USBを挿す、素早くテレタームを開く



結果

![o_coq550.jpg](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/840352/4f0824f9-eaef-f3a9-3703-a394756d1fe3.jpeg)


![o_coq551.jpg](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/840352/7784202e-c154-c4e5-4cb4-eb5f2cd4a241.jpeg)


(ホストとスレーブ)

![o_coq552.jpg](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/840352/35756093-0a1b-d359-6c19-c61366a5b297.jpeg)


![o_coq553.jpg](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/840352/d835d5e8-c22f-174a-99f3-ac10e2c3a1ed.jpeg)


プログラム

(ホストNanoC6(温度))

```c++


/*
    ESP-NOW Broadcast Master
    Lucas Saavedra Vaz - 2024

    This sketch demonstrates how to broadcast messages to all devices within the ESP-NOW network.
    This example is intended to be used with the ESP-NOW Broadcast Slave example.

    The master device will broadcast a message every 5 seconds to all devices within the network.
    This will be done using by registering a peer object with the broadcast address.

    The slave devices will receive the broadcasted messages and print them to the Serial Monitor.
*/

#include "ESP32_NOW.h"
#include "WiFi.h"

#include <esp_mac.h>  // For the MAC2STR and MACSTR macros

#include <math.h> //logの計算等で使う

/* Definitions */

#define ESPNOW_WIFI_CHANNEL 6

/* Classes */

// Creating a new class that inherits from the ESP_NOW_Peer class is required.

class ESP_NOW_Broadcast_Peer : public ESP_NOW_Peer {
public:
  // Constructor of the class using the broadcast address
  ESP_NOW_Broadcast_Peer(uint8_t channel, wifi_interface_t iface, const uint8_t *lmk) : ESP_NOW_Peer(ESP_NOW.BROADCAST_ADDR, channel, iface, lmk) {}

  // Destructor of the class
  ~ESP_NOW_Broadcast_Peer() {
    remove();
  }

  // Function to properly initialize the ESP-NOW and register the broadcast peer
  bool begin() {
    if (!ESP_NOW.begin() || !add()) {
      log_e("Failed to initialize ESP-NOW or register the broadcast peer");
      return false;
    }
    return true;
  }

  // Function to send a message to all devices within the network
  bool send_message(const uint8_t *data, size_t len) {
    if (!send(data, len)) {
      log_e("Failed to broadcast message");
      return false;
    }
    return true;
  }
};

/* Global Variables */

uint32_t msg_count = 0;

// Create a broadcast peer object
ESP_NOW_Broadcast_Peer broadcast_peer(ESPNOW_WIFI_CHANNEL, WIFI_IF_STA, NULL);

/* Main */

void setup() {
  Serial.begin(115200);
  //while (!Serial) {
  //  delay(10);
  //}

  for(int i=0;i<16;i++){
    Serial.print(".");
    delay(1000);
  }//for
  Serial.println();

  // Initialize the Wi-Fi module
  WiFi.mode(WIFI_STA);
  WiFi.setChannel(ESPNOW_WIFI_CHANNEL);
  while (!WiFi.STA.started()) {
    delay(100);
  }

  Serial.println("ESP-NOW Example - Broadcast Master");
  Serial.println("Wi-Fi parameters:");
  Serial.println("  Mode: STA");
  Serial.println("  MAC Address: " + WiFi.macAddress());
  Serial.printf("  Channel: %d\n", ESPNOW_WIFI_CHANNEL);

  // Register the broadcast peer
  if (!broadcast_peer.begin()) {
    Serial.println("Failed to initialize broadcast peer");
    Serial.println("Reebooting in 5 seconds...");
    delay(5000);
    ESP.restart();
  }

  Serial.println("Setup complete. Broadcasting messages every 5 seconds.");
}

void loop() {
  // Broadcast a message to all devices within the network
  static char data[256+1];

  //↓温度センサーの処理を開始

  int B = 4275;               // B value of the thermistor
  int R0 = 100000;            // R0 = 100k

  int pinTempSensor = 1;     // Grove - Temperature Sensor connect to G1

  int a = analogRead(pinTempSensor);

  //float R = 1023.0/a-1.0;
  //R = R0*R;
  float R,v1,a1,o1; 
  v1 = ((float)a) * 0.001; //電圧を求める
  a1 = v1 / 100000.0;           //電流を求める
  o1 = 5.0 / a1;                //全体の抵抗を求める
  R = o1 - 100000.0;    //全体の抵抗から検出抵抗を引く

  float temperature = 1.0/(log(R/R0)/B+1/298.15)-273.15; // convert to temperature via datasheet

  //↑温度センサーの処理が終了

  snprintf(data, sizeof(data), "temperature = %d #%lu",(int)temperature, msg_count++);

  Serial.printf("Broadcasting message: %s\n", data);

  if (!broadcast_peer.send_message((uint8_t *)data, sizeof(data))) {
    Serial.println("Failed to broadcast message");
  }

  delay(5000);
}

```


(スレーブStampS3(シリアル出力))


```c++



/*
    ESP-NOW Broadcast Slave
    Lucas Saavedra Vaz - 2024

    This sketch demonstrates how to receive broadcast messages from a master device using the ESP-NOW protocol.

    The master device will broadcast a message every 5 seconds to all devices within the network.

    The slave devices will receive the broadcasted messages. If they are not from a known master, they will be registered as a new master
    using a callback function.
*/

#include "ESP32_NOW.h"
#include "WiFi.h"

#include <esp_mac.h>  // For the MAC2STR and MACSTR macros

#include <vector>

/* Definitions */

#define ESPNOW_WIFI_CHANNEL 6

/* Classes */

// Creating a new class that inherits from the ESP_NOW_Peer class is required.

class ESP_NOW_Peer_Class : public ESP_NOW_Peer {
public:
  // Constructor of the class
  ESP_NOW_Peer_Class(const uint8_t *mac_addr, uint8_t channel, wifi_interface_t iface, const uint8_t *lmk) : ESP_NOW_Peer(mac_addr, channel, iface, lmk) {}

  // Destructor of the class
  ~ESP_NOW_Peer_Class() {}

  // Function to register the master peer
  bool add_peer() {
    if (!add()) {
      log_e("Failed to register the broadcast peer");
      return false;
    }
    return true;
  }

  // Function to print the received messages from the master
  void onReceive(const uint8_t *data, size_t len, bool broadcast) {
    Serial.printf("Received a message from master " MACSTR " (%s)\n", MAC2STR(addr()), broadcast ? "broadcast" : "unicast");
    Serial.printf("  Message: %s\n", (char *)data);
  }
};

/* Global Variables */

// List of all the masters. It will be populated when a new master is registered
std::vector<ESP_NOW_Peer_Class> masters;

/* Callbacks */

// Callback called when an unknown peer sends a message
void register_new_master(const esp_now_recv_info_t *info, const uint8_t *data, int len, void *arg) {
  if (memcmp(info->des_addr, ESP_NOW.BROADCAST_ADDR, 6) == 0) {
    Serial.printf("Unknown peer " MACSTR " sent a broadcast message\n", MAC2STR(info->src_addr));
    Serial.println("Registering the peer as a master");

    ESP_NOW_Peer_Class new_master(info->src_addr, ESPNOW_WIFI_CHANNEL, WIFI_IF_STA, NULL);

    masters.push_back(new_master);
    if (!masters.back().add_peer()) {
      Serial.println("Failed to register the new master");
      return;
    }
  } else {
    // The slave will only receive broadcast messages
    log_v("Received a unicast message from " MACSTR, MAC2STR(info->src_addr));
    log_v("Igorning the message");
  }
}

/* Main */

void setup() {
  Serial.begin(115200);
  //while (!Serial) {
  //  delay(10);
  //}

  for(int i=0;i<16;i++){
    Serial.print(".");
    delay(1000);
  }//for
  Serial.println();

  // Initialize the Wi-Fi module
  WiFi.mode(WIFI_STA);
  WiFi.setChannel(ESPNOW_WIFI_CHANNEL);
  while (!WiFi.STA.started()) {
    delay(100);
  }

  Serial.println("ESP-NOW Example - Broadcast Slave");
  Serial.println("Wi-Fi parameters:");
  Serial.println("  Mode: STA");
  Serial.println("  MAC Address: " + WiFi.macAddress());
  Serial.printf("  Channel: %d\n", ESPNOW_WIFI_CHANNEL);

  // Initialize the ESP-NOW protocol
  if (!ESP_NOW.begin()) {
    Serial.println("Failed to initialize ESP-NOW");
    Serial.println("Reeboting in 5 seconds...");
    delay(5000);
    ESP.restart();
  }

  // Register the new peer callback
  ESP_NOW.onNewPeer(register_new_master, NULL);

  Serial.println("Setup complete. Waiting for a master to broadcast a message...");
}

void loop() {
  delay(1000);
}


```


●●●●●●●●●●参考●●●●●●●●●●

もとのプログラム
------------------------------------------

![o_coq549.jpg](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/840352/0e88847d-ca0f-83a1-5be3-2f7978255ed0.jpeg)



```c++


/*
    ESP-NOW Broadcast Master
    Lucas Saavedra Vaz - 2024

    This sketch demonstrates how to broadcast messages to all devices within the ESP-NOW network.
    This example is intended to be used with the ESP-NOW Broadcast Slave example.

    The master device will broadcast a message every 5 seconds to all devices within the network.
    This will be done using by registering a peer object with the broadcast address.

    The slave devices will receive the broadcasted messages and print them to the Serial Monitor.
*/

#include "ESP32_NOW.h"
#include "WiFi.h"

#include <esp_mac.h>  // For the MAC2STR and MACSTR macros

/* Definitions */

#define ESPNOW_WIFI_CHANNEL 6

/* Classes */

// Creating a new class that inherits from the ESP_NOW_Peer class is required.

class ESP_NOW_Broadcast_Peer : public ESP_NOW_Peer {
public:
  // Constructor of the class using the broadcast address
  ESP_NOW_Broadcast_Peer(uint8_t channel, wifi_interface_t iface, const uint8_t *lmk) : ESP_NOW_Peer(ESP_NOW.BROADCAST_ADDR, channel, iface, lmk) {}

  // Destructor of the class
  ~ESP_NOW_Broadcast_Peer() {
    remove();
  }

  // Function to properly initialize the ESP-NOW and register the broadcast peer
  bool begin() {
    if (!ESP_NOW.begin() || !add()) {
      log_e("Failed to initialize ESP-NOW or register the broadcast peer");
      return false;
    }
    return true;
  }

  // Function to send a message to all devices within the network
  bool send_message(const uint8_t *data, size_t len) {
    if (!send(data, len)) {
      log_e("Failed to broadcast message");
      return false;
    }
    return true;
  }
};

/* Global Variables */

uint32_t msg_count = 0;

// Create a broadcast peer object
ESP_NOW_Broadcast_Peer broadcast_peer(ESPNOW_WIFI_CHANNEL, WIFI_IF_STA, NULL);

/* Main */

void setup() {
  Serial.begin(115200);
  while (!Serial) {
    delay(10);
  }

  // Initialize the Wi-Fi module
  WiFi.mode(WIFI_STA);
  WiFi.setChannel(ESPNOW_WIFI_CHANNEL);
  while (!WiFi.STA.started()) {
    delay(100);
  }

  Serial.println("ESP-NOW Example - Broadcast Master");
  Serial.println("Wi-Fi parameters:");
  Serial.println("  Mode: STA");
  Serial.println("  MAC Address: " + WiFi.macAddress());
  Serial.printf("  Channel: %d\n", ESPNOW_WIFI_CHANNEL);

  // Register the broadcast peer
  if (!broadcast_peer.begin()) {
    Serial.println("Failed to initialize broadcast peer");
    Serial.println("Reebooting in 5 seconds...");
    delay(5000);
    ESP.restart();
  }

  Serial.println("Setup complete. Broadcasting messages every 5 seconds.");
}

void loop() {
  // Broadcast a message to all devices within the network
  char data[32];
  snprintf(data, sizeof(data), "Hello, World! #%lu", msg_count++);

  Serial.printf("Broadcasting message: %s\n", data);

  if (!broadcast_peer.send_message((uint8_t *)data, sizeof(data))) {
    Serial.println("Failed to broadcast message");
  }

  delay(5000);
}

```


```c++



/*
    ESP-NOW Broadcast Slave
    Lucas Saavedra Vaz - 2024

    This sketch demonstrates how to receive broadcast messages from a master device using the ESP-NOW protocol.

    The master device will broadcast a message every 5 seconds to all devices within the network.

    The slave devices will receive the broadcasted messages. If they are not from a known master, they will be registered as a new master
    using a callback function.
*/

#include "ESP32_NOW.h"
#include "WiFi.h"

#include <esp_mac.h>  // For the MAC2STR and MACSTR macros

#include <vector>

/* Definitions */

#define ESPNOW_WIFI_CHANNEL 6

/* Classes */

// Creating a new class that inherits from the ESP_NOW_Peer class is required.

class ESP_NOW_Peer_Class : public ESP_NOW_Peer {
public:
  // Constructor of the class
  ESP_NOW_Peer_Class(const uint8_t *mac_addr, uint8_t channel, wifi_interface_t iface, const uint8_t *lmk) : ESP_NOW_Peer(mac_addr, channel, iface, lmk) {}

  // Destructor of the class
  ~ESP_NOW_Peer_Class() {}

  // Function to register the master peer
  bool add_peer() {
    if (!add()) {
      log_e("Failed to register the broadcast peer");
      return false;
    }
    return true;
  }

  // Function to print the received messages from the master
  void onReceive(const uint8_t *data, size_t len, bool broadcast) {
    Serial.printf("Received a message from master " MACSTR " (%s)\n", MAC2STR(addr()), broadcast ? "broadcast" : "unicast");
    Serial.printf("  Message: %s\n", (char *)data);
  }
};

/* Global Variables */

// List of all the masters. It will be populated when a new master is registered
std::vector<ESP_NOW_Peer_Class> masters;

/* Callbacks */

// Callback called when an unknown peer sends a message
void register_new_master(const esp_now_recv_info_t *info, const uint8_t *data, int len, void *arg) {
  if (memcmp(info->des_addr, ESP_NOW.BROADCAST_ADDR, 6) == 0) {
    Serial.printf("Unknown peer " MACSTR " sent a broadcast message\n", MAC2STR(info->src_addr));
    Serial.println("Registering the peer as a master");

    ESP_NOW_Peer_Class new_master(info->src_addr, ESPNOW_WIFI_CHANNEL, WIFI_IF_STA, NULL);

    masters.push_back(new_master);
    if (!masters.back().add_peer()) {
      Serial.println("Failed to register the new master");
      return;
    }
  } else {
    // The slave will only receive broadcast messages
    log_v("Received a unicast message from " MACSTR, MAC2STR(info->src_addr));
    log_v("Igorning the message");
  }
}

/* Main */

void setup() {
  Serial.begin(115200);
  while (!Serial) {
    delay(10);
  }

  // Initialize the Wi-Fi module
  WiFi.mode(WIFI_STA);
  WiFi.setChannel(ESPNOW_WIFI_CHANNEL);
  while (!WiFi.STA.started()) {
    delay(100);
  }

  Serial.println("ESP-NOW Example - Broadcast Slave");
  Serial.println("Wi-Fi parameters:");
  Serial.println("  Mode: STA");
  Serial.println("  MAC Address: " + WiFi.macAddress());
  Serial.printf("  Channel: %d\n", ESPNOW_WIFI_CHANNEL);

  // Initialize the ESP-NOW protocol
  if (!ESP_NOW.begin()) {
    Serial.println("Failed to initialize ESP-NOW");
    Serial.println("Reeboting in 5 seconds...");
    delay(5000);
    ESP.restart();
  }

  // Register the new peer callback
  ESP_NOW.onNewPeer(register_new_master, NULL);

  Serial.println("Setup complete. Waiting for a master to broadcast a message...");
}

void loop() {
  delay(1000);
}

```