#include <WiFi101.h>
#include <SPI.h>
#include <SoftwareSerial.h> //we have to include the SoftwareSerial library, or else we can't use it
#define rx 2 //define what pin rx is going to be
#define tx 3 //define what pin tx is going to be
// WLAN parameters
char ssid[] = ""; // your network SSID (name)
char pass[] = "*"; // your network password
int status = WL_IDLE_STATUS; // the WiFi radio's status
WiFiServer server(80);
char thingSpeakAddress[] = "api.thingspeak.com";
String APIKey = "***********"; //enter your channel's Write API Key
const int updateThingSpeakInterval = 20 * 1000; // 20 second interval at which to update ThingSpeak
// Variable Setup
long lastConnectionTime = 0;
boolean lastConnected = false;
// Initialize Arduino Ethernet Client
WiFiClient client;
SoftwareSerial myserial(rx, tx); //define how the soft serial port is going to work
String inputstring = ""; //a string to hold incoming data from the PC
String sensorstring = ""; //a string to hold the data from the Atlas Scientific product
boolean input_string_complete = false; //have we received all the data from the PC
boolean sensor_string_complete = false; //have we received all the data from the Atlas Scientific product
float ORP; //used to hold a floating point number that is the ORP
void setup()
{
// Start Serial for debugging on the Serial Monitor
myserial.begin(9600); //set baud rate for the software serial port to 9600
inputstring.reserve(10); //set aside some bytes for receiving data from the PC
sensorstring.reserve(30); //set aside some bytes for receiving data from Atlas Scientific product
Serial.begin(9600);
while (!Serial)
{
; // wait for serial port to connect. Needed for Leonardo only
}
// check for the presence of the shield:
if (WiFi.status() == WL_NO_SHIELD)
{
Serial.println("WiFi shield not present");
// don't continue:
while (true);
}
// attempt to connect to Wifi network:
while ( status != WL_CONNECTED)
{
Serial.print("Attempting to connect to SSID: ");
Serial.println(ssid);
// Connect to WPA/WPA2 network. Change this line if using open or WEP network:
status = WiFi.begin(ssid, pass);
// wait 10 seconds for connection:
delay(10000);
}
//set up the hardware
myserial.begin(9600); //set baud rate for the software serial port to 9600
inputstring.reserve(10); //set aside some bytes for receiving data from the PC
sensorstring.reserve(30); //set aside some bytes for receiving data from Atlas Scientific product
// you're connected now, so print out the status:
printWifiStatus();
}
void serialEvent()
{ //if the hardware serial port_0 receives a char
inputstring = Serial.readStringUntil(13); //read the string until we see a
input_string_complete = true; //set the flag used to tell if we have received a completed string from the PC
}
void loop()
{
//here we go...
if (input_string_complete == true) { //if a string from the PC has been received in its entirety
myserial.print(inputstring); //send that string to the Atlas Scientific product
myserial.print('\r'); //add a to the end of the string
inputstring = ""; //clear the string
input_string_complete = false; //reset the flag used to tell if we have received a completed string from the PC
}
if (myserial.available() > 0) { //if we see that the Atlas Scientific product has sent a character
char inchar = (char)myserial.read(); //get the char we just received
sensorstring += inchar; //add the char to the var called sensorstring
if (inchar == '\r') { //if the incoming character is a
sensor_string_complete = true; //set the flag
}
}
{
if (sensor_string_complete == true)
{ //if a string from the Atlas Scientific product has been received in its entirety
Serial.println(sensorstring); //send that string to the PC's serial monitor
Serial.print(" , ");
if (isdigit(sensorstring[0]))
{ //if the first character in the string is a digit
ORP = sensorstring.toFloat(); //convert the string to a floating point number so it can be evaluated by the Arduino
if (ORP >= 500.0)
{ //if the ORP is greater than or equal to 500
Serial.println("high"); //print "high" this is demonstrating that the Arduino is evaluating the ORP as a number and not as a string
}
if (ORP <= 499.9)
{ //if the ORP is less than or equal to 499.9
Serial.println("low"); //print "low" this is demonstrating that the Arduino is evaluating the ORP as a number and not as a string
}
}
sensorstring = ""; //clear the string
sensor_string_complete = false; //reset the flag used to tell if we have received a completed string from the Atlas Scientific product
}
}
// Print Update Response to Serial Monitor
if (client.available())
{
char c = client.read();
Serial.print(c);
}
// Disconnect from ThingSpeak
if (!client.connected() && lastConnected)
{
Serial.println("...disconnected");
Serial.println();
client.stop();
}
// Update ThingSpeak
if (!client.connected() && (millis() - lastConnectionTime > updateThingSpeakInterval))
{
updateThingSpeak("field1=" + sensorstring);
Serial.println(sensorstring);
}
lastConnected = client.connected();
}
void updateThingSpeak(String tsData) {
if (client.connect(thingSpeakAddress, 80)) {
client.print("POST /update HTTP/1.1\n");
client.print("Host: api.thingspeak.com\n");
client.print("Connection: close\n");
client.print("X-THINGSPEAKAPIKEY: " + APIKey + "\n");
client.print("Content-Type: application/x-www-form-urlencoded\n");
client.print("Content-Length: ");
client.print(tsData.length());
client.print("\n\n");
client.print(tsData);
lastConnectionTime = millis();
if (client.connected()) {
Serial.println("Connecting to ThingSpeak...");
Serial.println();
}
}
}
void printWifiStatus() {
// print the SSID of the network you're attached to:
Serial.print("SSID: ");
Serial.println(WiFi.SSID());
// print your WiFi shield's IP address:
IPAddress ip = WiFi.localIP();
Serial.print("IP Address: ");
Serial.println(ip);
// print the received signal strength:
long rssi = WiFi.RSSI();
Serial.print("signal strength (RSSI):");
Serial.print(rssi);
Serial.println(" dBm");
}