some arduino sketches

arduino/wwvb/wwvb.ino

@@ -0,0 +1,110 @@
+/*
+  ESP8266 Blink by Simon Peter
+  Blink the blue LED on the ESP-01 module
+  This example code is in the public domain
+
+  The blue LED on the ESP-01 module is connected to GPIO1
+  (which is also the TXD pin; so we cannot use Serial.print() at the same time)
+
+  Note that this sketch uses LED_BUILTIN to find the pin with the internal LED
+*/
+
+#define WWV_SIGNAL_PIN 14
+
+void ICACHE_RAM_ATTR readLevel();
+
+volatile byte wwvbInState;            // store receiver signal level
+
+byte prevWwvbInState;                 // store previous signal level
+unsigned int prevEdgeMillis;          // store time signal was read
+byte bitVal;                          // bit decoded 0, 1 or Mark
+byte badBit;                          // bad bit, noise detected
+byte prevMark;                        // store previous mark bit
+
+void setup() {
+  pinMode(LED_BUILTIN, OUTPUT);     // Initialize the LED_BUILTIN pin as an output
+  pinMode(WWV_SIGNAL_PIN, INPUT);
+  attachInterrupt(digitalPinToInterrupt(WWV_SIGNAL_PIN), readLevel, CHANGE); // fire interrupt on edge detected
+  Serial.begin(9600);
+  Serial.print("herro booted\n");
+}
+
+// the loop function runs over and over again forever
+void loop() {
+  if (wwvbInState != prevWwvbInState) {
+    pulseValue();
+    prevWwvbInState = wwvbInState;
+  }
+  yield();
+}
+
+void pulseValue() {
+  unsigned int edgeMillis = millis();         // save current time
+  badBit = 0;                                 // set noise counter to zero
+  if (wwvbInState == 1) {                     // rising edge
+    prevEdgeMillis = edgeMillis;              // set previous time to current
+  } 
+  else {                                    // falling edge
+    int pulseLength = edgeMillis - prevEdgeMillis; // calculate pulse length millis
+    if (pulseLength < 100) {                  // less than 100ms, noise pulses
+      badBit = 1;
+    } 
+    else if (pulseLength < 400) {           // 800ms carrier drop mark
+      bitVal = 2;
+    } 
+    else if (pulseLength < 700) {           // 500ms carrier drop one
+      bitVal = 1;
+    } 
+    else {                                  // 200ms carrier drop zero
+      bitVal = 0;
+    }
+    if (badBit == 0) {
+      printBitVal();
+    }
+  }
+}
+
+
+void readLevel() {
+  wwvbInState = digitalRead(WWV_SIGNAL_PIN);   // read signal level
+  digitalWrite(LED_BUILTIN, !wwvbInState); // flash WWVB receiver indicator pin
+  yield();
+
+}
+
+
+void printBitVal() {
+  if ((bitVal == 2) && (prevMark == 0)) {
+    Serial.print(" : ");
+
+    prevMark = 1;
+  } 
+  else if ((bitVal == 2) && (prevMark == 1)) {
+    Serial.print("\nBit Value: ");
+    Serial.print("| ");
+
+    prevMark = 0;
+  } 
+  else {
+    Serial.print(bitVal, DEC);
+    prevMark = 0; 
+  }
+}
+
+/*****************************************************************************
+ * Time display functions
+ *****************************************************************************/
+
+void printTime() {
+  Serial.print("?x00?y0?f"); // movie cursor to line 1 char 1, clear screen
+}
+
+// LCD routines to initialize LCD and clear screen
+void lcdInit() {           // using P H Anderson Serial LCD driver board
+  Serial.print("?G216");   // configure driver for 2 x 16 LCD
+  delay(300);
+  Serial.print("?BDD");    // set backlight brightness
+  delay(300);
+  Serial.print("?f");      // clear screen
+  Serial.print("?c0");     // set cursor off
+}