スズラボ通信（Vol.57掲載）

著者：すずきひろのぶ

前回は、Arduino IDEを使って、中国Espressif Systems社のSoC「ESP32」を搭載する開発ボード「ESP32-DevKitC v2」で動作するサンプルプログラムを作成しました。今回は、前回作成したサンプルプログラムを省電力化してみます。

シェルスクリプトマガジン Vol.57は以下のリンク先でご購入できます。

// Hironobu SUZUKI
// <suzuki.hironobu@gmail.com>
// SUZULABO
#include <WiFi.h>
#include <WiFiUdp.h>

#define SENDBUFSIZE 32
#define SLEEPTIME  3
char ssid[] = "XXXXX";
char pass[] = "XXXXXX";
const char remoteIpAddr[] = "192.168.1.3";
const int port = 21231;
uint8_t  sendBuffer[SENDBUFSIZE];
int counter = 1;

int WiFiStatus = WL_IDLE_STATUS;
WiFiUDP udp;
void setup() {
  Serial.begin(115200);
  WiFiConnectionManage();
  udp.begin(port);
}
void loop() {
  for (int j = 0; j < SENDBUFSIZE; j++) {
    sendBuffer[j] = 0;
  }
  sendBuffer[0] = counter;
  sendBuffer[1] = '\0';
  WiFiConnectionManage();
  udp.beginPacket(remoteIpAddr, port);
  udp.write(sendBuffer, sizeof(sendBuffer));
  udp.endPacket();
  Serial.println(counter++);
  delay(500);
  if ( counter > 30 ) {
    system_deep_sleep(10 * 1000000);
  }
}
void WiFiConnectionManage() {
  int connection_error = 0;
  if ( (WiFiStatus = WiFi.status()) == WL_NO_SHIELD) {
    WiFiStatus = WL_IDLE_STATUS;
  }
  switch (WiFiStatus) {
    case WL_CONNECT_FAILED: // disconnect -> build connection
      WiFi.disconnect();
    case WL_DISCONNECTED: // build connection
    case WL_IDLE_STATUS:  // build connection
      Serial.print("WiFi Status: ");
      Serial.println(WiFiStatus);
      Serial.print("Attempting to WiFi connection SSID: ");
      Serial.println(ssid);
      while ( true ) {
        WiFiStatus = WiFi.begin(ssid, pass);
        if (  WiFiStatus == WL_CONNECTED ) {
          break;
        }
        delay(10000);
        if ( connection_error > 6 ) {
          // Too many connection error why? reboot.
          ESP.restart();
        }
        connection_error++;
      }
      Serial.println("WiFi Connection Complete.");
      delay(10000);
      printWifiStatus();
      break;
    case WL_CONNECTION_LOST: // lost -> try reconnection
      Serial.println("Try WiFi reconnect");
      WiFi.reconnect();
      break;
    default:
      break;
  }
}
void printWifiStatus() {
  String myssid;
  while (true) {
    myssid = WiFi.SSID();
    if (myssid != "" ) {
      break;
    }
    delay(3000);
  }
  Serial.print("SSID: ");
  Serial.println(myssid);
  IPAddress ip = WiFi.localIP();
  Serial.print("IP Address: ");
  Serial.println(ip);
}

// Hironobu SUZUKI

// <suzuki.hironobu@gmail.com>

// SUZULABO

#include <WiFi.h>

#include <WiFiUdp.h>

#define SENDBUFSIZE 32

#define SLEEPTIME 3

char ssid[] = "XXXXX";

char pass[] = "XXXXXX";

const char remoteIpAddr[] = "192.168.1.3";

const int port = 21231;

uint8_t sendBuffer[SENDBUFSIZE];

int counter = 1;

int WiFiStatus = WL_IDLE_STATUS;

WiFiUDP udp;

void setup() {

Serial.begin(115200);

WiFiConnectionManage();

udp.begin(port);

}

void loop() {

for (int j = 0; j < SENDBUFSIZE; j++) {

sendBuffer[j] = 0;

}

sendBuffer[0] = counter;

sendBuffer[1] = '\0';

WiFiConnectionManage();

udp.beginPacket(remoteIpAddr, port);

udp.write(sendBuffer, sizeof(sendBuffer));

udp.endPacket();

Serial.println(counter++);

delay(500);

if ( counter > 30 ) {

system_deep_sleep(10 * 1000000);

}

void WiFiConnectionManage() {

int connection_error = 0;

if ( (WiFiStatus = WiFi.status()) == WL_NO_SHIELD) {

WiFiStatus = WL_IDLE_STATUS;

}

switch (WiFiStatus) {

case WL_CONNECT_FAILED: // disconnect -> build connection

WiFi.disconnect();

case WL_DISCONNECTED: // build connection

case WL_IDLE_STATUS: // build connection

Serial.print("WiFi Status: ");

Serial.println(WiFiStatus);

Serial.print("Attempting to WiFi connection SSID: ");

Serial.println(ssid);

while ( true ) {

WiFiStatus = WiFi.begin(ssid, pass);

if ( WiFiStatus == WL_CONNECTED ) {

break;

}

delay(10000);

if ( connection_error > 6 ) {

// Too many connection error why? reboot.

ESP.restart();

}

connection_error++;

}

Serial.println("WiFi Connection Complete.");

delay(10000);

printWifiStatus();

break;

case WL_CONNECTION_LOST: // lost -> try reconnection

Serial.println("Try WiFi reconnect");

WiFi.reconnect();

break;

default:

break;

}

void printWifiStatus() {

String myssid;

while (true) {

myssid = WiFi.SSID();

if (myssid != "" ) {

break;

}

delay(3000);

}

Serial.print("SSID: ");

Serial.println(myssid);

IPAddress ip = WiFi.localIP();

Serial.print("IP Address: ");

Serial.println(ip);

}

if ( counter > 30 ) {
  esp_sleep_enable_timer_wakeup(10*1000000);
  esp_light_sleep_start();
  counter = 0;
}

if ( counter > 30 ) {

esp_sleep_enable_timer_wakeup(10*1000000);

esp_light_sleep_start();

counter = 0;

}