Update examples and Readme

Author: carrascoacd

HttpExample/HttpExample.ino

@@ -3,7 +3,11 @@
 
 unsigned long lastRunTime = 0;
 unsigned long waitForRunTime = 0;
-HTTP http;
+
+unsigned int RX_PIN = 7;
+unsigned int TX_PIN = 8;
+unsigned int RST_PIN = 12;
+HTTP http(9600, RX_PIN, TX_PIN, RST_PIN);
 
 // the setup routine runs once when you press reset:
 void setup() {

HttpExample/WeatherStationExample.ino

@@ -0,0 +1,103 @@
+#include <ArduinoJson.h>
+#include <Http.h>
+
+unsigned long lastRunTime = 0;
+unsigned long waitForRunTime = 0;
+
+unsigned int RX_PIN = 7;
+unsigned int TX_PIN = 8;
+unsigned int RST_PIN = 12;
+HTTP http(9600, RX_PIN, TX_PIN, RST_PIN);
+/*
+ * the setup routine runs once when you press reset:
+ */
+void setup() {
+  Serial.begin(9600);
+  while(!Serial);
+  Serial.println("Starting!");
+}
+
+/*
+ * the loop routine runs over and over again forever:
+ */
+void loop() {
+  if (shouldTrackTimeEntry()){
+    http.wakeUp();
+    trackTimeEntry();
+  }
+  else {
+    http.sleep();
+  }
+}
+
+/*
+ * functions
+ */
+void print(const __FlashStringHelper *message, int code = -1){
+  if (code != -1){
+    Serial.print(message);
+    Serial.println(code);
+  }
+  else {
+    Serial.println(message);
+  }
+}
+
+bool shouldTrackTimeEntry(){
+  /*
+   * This calculation uses the max value the unsigned long can store as key. Remember when a negative number 
+   * is assigned or the maximun is exceeded, then the module is applied to that value.
+   */
+  unsigned long elapsedTime = millis() - lastRunTime;
+  print(F("Elapsed time: "), elapsedTime);
+  return elapsedTime >= waitForRunTime;
+}
+
+void readVoltage(char *voltageBuffer){
+   /* 
+   * We are using a voltage divider, so the voltage in each resistence is calculated by:
+   * Vn = (Rn / R1 + .. + Rn) * Vt. In our example: V = (270/270 + 270) * 5V = 2.5v
+   */
+  int input = analogRead(0);    // Read the input pin. Possible values are betwen 0 (0v) to 1023 (5v)
+  float maximumBatterVoltage = 5.0;
+  float maximumAnalogicIput = 1023.0;
+  float dividedVoltage = maximumBatterVoltage * input / maximumAnalogicIput;
+  
+  float voltage = dividedVoltage * 2; // We use 2 because of our two resistences are equal
+   /*
+   * As the Arduino implementaion of sprintf does not support float values we need to convert it to char
+   */
+  dtostrf(voltage, 4, 2, voltageBuffer);
+}
+
+void trackTimeEntry(){
+  
+  char response[32];
+  char body[90];
+  Result result;
+
+  print(F("Cofigure bearer: "), http.configureBearer("movistar.es"));
+  result = http.connect();
+  print(F("HTTP connect: "), result);
+
+  unsigned int moisture = random(1023);
+  char voltage[6];
+  readVoltage(voltage);
+  
+  sprintf(body, "[{\"weatherEntries\":[{\"moisture\": %d, \"currentVoltage\": %s}], \"name\": \"Arduino\"}]", moisture, voltage);
+  Serial.println(body);
+  result = http.post("smartgarden.herokuapp.com/api/devices", body, response);
+  print(F("HTTP POST: "), result);
+  if (result == SUCCESS) {
+    Serial.println(response);
+    StaticJsonBuffer<32> jsonBuffer;
+    JsonObject& root = jsonBuffer.parseObject(response);
+    lastRunTime = millis();
+    waitForRunTime = root["waitForRunTime"];
+    
+    print(F("Last run time: "), lastRunTime);
+    print(F("Next post in: "), waitForRunTime);
+  }
+  
+  print(F("HTTP disconnect: "), http.disconnect());
+}

Readme.md

@@ -14,7 +14,10 @@ Download the library and then import it.
 Here's some code to perform a GET request! :+1:
 
 ``` c++
-HTTP http;
+unsigned int RX_PIN = 7;
+unsigned int TX_PIN = 8;
+unsigned int RST_PIN = 12;
+HTTP http(9600, RX_PIN, TX_PIN, RST_PIN);
 http.configureBearer("movistar.es");
 http.connect();
 
@@ -31,7 +34,10 @@ http.disconnect();
 Here's some code to perform a POST request! :+1:
 
 ``` c++
-HTTP http;
+unsigned int RX_PIN = 7;
+unsigned int TX_PIN = 8;
+unsigned int RST_PIN = 12;
+HTTP http(9600, RX_PIN, TX_PIN, RST_PIN);
 http.configureBearer("movistar.es");
 http.connect();