Started morse example

Author: ed7coyne

examples/FirebaseMorse_ESP8266/FirebaseMorse_ESP8266.ino

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+//
+// Copyright 2015 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+// FirebaseStream_ESP8266 is a sample that stream bitcoin price from a
+// public Firebase and optionally display them on a OLED i2c screen.
+
+#include <FirebaseArduino.h>
+#include <ESP8266WiFi.h>
+#include <Adafruit_GFX.h>
+#include <Adafruit_SSD1306.h>
+
+// Set these to run example.
+#define WIFI_SSID "SSID"
+#define WIFI_PASSWORD "PASSWORD"
+
+// We define morse . to be binary 0 and - to be binary 1. The longest letter
+// is 5 morse elements long so we would have a sparse array of 2^5=32. But
+// we need to add a leading 1 to ensure that .- and ..- are not the same value.
+// This gives us a size of 2^6=64.
+char morseToChar[64];
+morseToChar[B101] = 'a';
+morseToChar[B11000] = 'b';
+morseToChar[B11010] = 'c';
+morseToChar[B1100] = 'd';
+morseToChar[B10] = 'e';
+morseToChar[B10010] = 'f';
+morseToChar[B1110] = 'g';
+morseToChar[B10000] = 'h';
+morseToChar[B100] = 'i';
+morseToChar[B1101] = 'k';
+morseToChar[B10100] = 'l';
+morseToChar[B111] = 'm';
+morseToChar[B1
+
+const int oledResetPin = 3;
+Adafruit_SSD1306 display(oledResetPin);
+
+const int morseButtonPin = 2;
+
+void setup() {
+  Serial.begin(9600);
+
+  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);  // initialize with the I2C addr 0x3C (for the 128x32)
+  display.display();
+
+  // connect to wifi.
+  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
+  Serial.print("connecting");
+  while (WiFi.status() != WL_CONNECTED) {
+    Serial.print(".");
+    delay(500);
+  }
+  Serial.println();
+  Serial.print("connected: ");
+  Serial.println(WiFi.localIP());
+  
+  Firebase.begin("publicdata-cryptocurrency.firebaseio.com");
+  Firebase.stream("/bitcoin/last");  
+}
+
+const int longPressThresholdMillis = 1000;
+
+bool morseButtonDownTime = 0;
+String currentMessage;
+String currentMorseLetter;
+void loop() {
+  // ButtonDown.
+  if (morseButtonDownTime == 0 && digitalRead(morseButtonPin) == LOW) {
+    morseButtonDownTime = millis();
+
+  // ButtonUp.
+  } else if (morseButtonDownTime != 0 && digitalRead(morseButtonPin) == HIGH) {
+    const int millisDown = millis() - moreseButtonDownTime;
+    morseButtonDownTime = 0;
+
+    const bool longPress = millisDown >= longPressThreshold; 
+    currentMorseLetter += longPress ? "." : "_";
+  }
+}