Update files.

include/KT0803/examples/KT0803_up_down/KT0803_up_down.ino

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+//
+//    FILE: KT0803_up_down.ino
+//  AUTHOR: Rob Tillaart
+// PURPOSE: minimal demo
+//     URL: https://github.com/RobTillaart/KT0803
+
+
+#include "Arduino.h"
+#include "Wire.h"
+#include "KT0803.h"
+
+
+KT0803 FM_SEND;
+
+//  connect two buttons to GND
+//  adjust pins to your needs,
+uint8_t UP_PIN = 6;
+uint8_t DOWN_PIN = 7;
+float freq = 100.0;
+float newFreq = 100.0;
+
+
+void setup()
+{
+  Serial.begin(115200);
+  while(!Serial);
+  Serial.println();
+  Serial.println(__FILE__);
+  Serial.print("KT0803_LIB_VERSION: ");
+  Serial.println(KT0803_LIB_VERSION);
+  Serial.println();
+
+  pinMode(UP_PIN, INPUT_PULLUP);
+  pinMode(DOWN_PIN, INPUT_PULLUP);
+  Wire.begin();
+
+  FM_SEND.begin(freq, false);
+}
+
+
+void loop()
+{
+  //  adjust frequency with up and down button.
+  uint8_t u = digitalRead(UP_PIN);
+  uint8_t d = digitalRead(DOWN_PIN);
+  if ((u == 0) && (d == 0))
+  {
+    newFreq = 100.0;
+  }
+  else if (u == 0)
+  {
+    newFreq += 0.1;
+    if (newFreq > 108.0) newFreq = 108.0;
+  }
+  else if (d == 0)
+  {
+    newFreq -= 0.1;
+    if (newFreq < 88.0) newFreq = 88.0;
+  }
+  if (newFreq != freq)
+  {
+    freq = newFreq;
+    FM_SEND.setFrequency(freq);
+
+    Serial.print("Freq: ");
+    Serial.print(FM_SEND.getFrequency());
+    Serial.print("\t");
+    Serial.println(FM_SEND.getChannel());
+
+    delay(100);
+  }
+}
+
+
+//  -- END OF FILE --