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examples/time_announcement/main.cpp

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+// This arduino sketch for ESP32 announces the time every hour.
+// A connection to the Internet is required
+// 1) to synchronize with the internal RTC on startup
+// 2) so that GoogleTTS can be reached
+
+
+
+#include <Arduino.h>
+#include "WiFiMulti.h"
+#include "Audio.h"
+#include "time.h"
+#include "esp_sntp.h"
+
+//------------------------USER SETTINGS / GPIOs-------------------------------------------------------------------------
+String ssid =     "xxxx";
+String password = "xxxx";
+uint8_t I2S_BCLK = 27;
+uint8_t I2S_LRC  = 26;
+uint8_t I2S_DOUT = 25;
+//------------------------OBJECTS /GLOBAL VARS--------------------------------------------------------------------------
+Audio audio(false, 3, 0);
+WiFiMulti wifiMulti;
+uint32_t sec1 = millis();
+String time_s = "";
+char chbuf[200];
+int timeIdx = 0;
+//------------------------TIME / SNTP STUFF-----------------------------------------------------------------------------
+#define TZName    "CET-1CEST,M3.5.0,M10.5.0/3"    // https://remotemonitoringsystems.ca/time-zone-abbreviations.php
+char strftime_buf[64];
+struct tm timeinfo;
+time_t now;
+boolean obtain_time(){
+    time_t now = 0;
+    int retry = 0;
+    Serial.println("Initializing SNTP");
+    sntp_setoperatingmode(SNTP_OPMODE_POLL);
+    sntp_setservername(0, "pool.ntp.org");
+    sntp_init();
+
+    const int retry_count = 10;
+    while(timeinfo.tm_year < (2016 - 1900) && ++retry < retry_count) {
+        Serial.printf("Waiting for system time to be set... (%d/%d)\n", retry, retry_count);
+        vTaskDelay(uint16_t(2000 / portTICK_PERIOD_MS));
+        time(&now);
+        localtime_r(&now, &timeinfo);
+    }
+    setenv("TZ", TZName, 1);
+    tzset();
+    localtime_r(&now, &timeinfo);
+    strftime(strftime_buf, sizeof(strftime_buf), "%c", &timeinfo);
+    if(retry < retry_count) return true;
+    else return false;
+}
+
+const char* gettime_s(){  // hh:mm:ss
+	time(&now);
+	localtime_r(&now, &timeinfo);
+	sprintf(strftime_buf,"%02d:%02d:%02d",  timeinfo.tm_hour, timeinfo.tm_min, timeinfo.tm_sec);
+	return strftime_buf;
+}
+//-----------------------SETUP------------------------------------------------------------------------------------------
+void setup() {
+    Serial.begin(115200);
+    wifiMulti.addAP(ssid.c_str(), password.c_str());
+    wifiMulti.run();
+    obtain_time();
+    audio.setPinout(I2S_BCLK, I2S_LRC, I2S_DOUT);
+    audio.setVolume(15);
+}
+//-----------------------LOOP-------------------------------------------------------------------------------------------
+void loop() {
+    audio.loop();
+    if(sec1 < millis()){    // every second
+        sec1 = millis() + 1000;
+        time_s = gettime_s();
+        Serial.println(time_s);
+        if(time_s.endsWith("00:00")){ // time announcement every full hour
+            char am_pm[5] = "am.";
+            int h = time_s.substring(0,2).toInt();
+            if(h > 12){h -= 12; strcpy(am_pm,"pm.");}
+            sprintf(chbuf, "It is now %i%s and %i minutes", h, am_pm, time_s.substring(3,5).toInt());
+            Serial.println(chbuf);
+            audio.connecttospeech(chbuf, "en");
+        }
+    }
+}
+//------------------EVENTS----------------------------------------------------------------------------------------------
+void audio_info(const char *info){
+    Serial.printf("info: %s\n", info);
+}