Код поправлен для правильной работы с Rst pin модуля, добавлен правильный antcap

src/Adafruit_Si4713.cpp

@@ -47,14 +47,14 @@ Adafruit_Si4713::Adafruit_Si4713(int8_t resetpin) { _rst = resetpin; }
  *
  */
 bool Adafruit_Si4713::begin(uint8_t addr, TwoWire *theWire) {
-  if (i2c_dev)
+    reset();
+
     delete i2c_dev;
+
     i2c_dev = new Adafruit_I2CDevice(addr, theWire);
     if (!i2c_dev->begin())
         return false;
 
-  reset();
-
     powerUp();
 
     // check for Si4713
@@ -72,9 +72,9 @@ void Adafruit_Si4713::reset() {
   if (_rst > 0) {
     pinMode(_rst, OUTPUT);
     digitalWrite(_rst, HIGH);
-    delay(10);
+    delay(100);
     digitalWrite(_rst, LOW);
-    delay(10);
+    delay(100);
     digitalWrite(_rst, HIGH);
   }
 }

src/main.cpp

@@ -41,6 +41,8 @@ void do_i2c_scan() {
 
     if (!radio->begin()) {  // begin with address 0x63 (CS high default)
         Serial.println("Couldn't find radio?");
+        Serial.println("Run I2C scanner...");
+        do_i2c_scan();
         while (1);
     }
 
@@ -55,19 +57,15 @@ void do_i2c_scan() {
      */
 
     Serial.print("\nSet TX power");
-    radio->setTXpower(114);  // dBuV, 88-115 max
+    radio->setTXpower(115, 55);  // dBuV, 88-115 max, cap надо задать 0 и посмотреть сколько будет
 
     Serial.print("\nTuning into freq");
     radio->tuneFM(10740); // 100.0 mhz
 
     // This will tell you the status in case you want to read it from the chip
     radio->readTuneStatus();
-    Serial.print("\tCurr freq: ");
-    Serial.println(radio->currFreq);
-    Serial.print("\tCurr freqdBuV:");
-    Serial.println(radio->currdBuV);
-    Serial.print("\tCurr ANTcap:");
-    Serial.println(radio->currAntCap);
+    Serial.printf("Curr tuned: freq=%d, freqdBuV=%d, ANTcap=%d\n",
+                  radio->currFreq, radio->currdBuV, radio->currAntCap);
 
     // begin the RDS/RDBS transmission
     radio->beginRDS();