#include <SPI.h>
#include <WiFiNINA.h>
/////// Wifi Settings ///////
char ssid[] = "Xavier";
char pass[] = "19970926";
int keyIndex = 0; // your network key Index number (needed only for WEP)
int trigPin=2;
int echoPin=3;
long duration;
int distance=500;
// the IP address for the shield:
IPAddress ip(192, 168, 122, 122);
int status = WL_IDLE_STATUS;
WiFiServer server(80);
String readString;
void setup() {
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
Serial.begin(9600);
// check for the presence of the shield:
if (WiFi.status() == WL_NO_SHIELD) {
Serial.println("WiFi shield not present");
// don't continue:
while (true);
}
WiFi.config(ip);
// 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);
}
// you're connected now, so print out the status:
printWiFiStatus();
Serial.print("IP Address: ");
Serial.println(WiFi.localIP());
server.begin();
}
void loop() {
// listen for incoming clients
WiFiClient client = server.available();
if (client) {
Serial.println("new client");
// an http request ends with a blank line
boolean currentLineIsBlank = true;
while (client.connected()) {
if (client.available()) {
char c = client.read();// Read char by char HTTP request
readString += c;
Serial.write(c);
// if you've gotten to the end of the line (received a newline
// character) and the line is blank, the http request has ended,
// so you can send a reply
if (c == '\n' && currentLineIsBlank) {
// send a standard http response header
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println("Connection: close"); // the connection will be closed after completion of the response
client.println("Refresh: 5"); // refresh the page automatically every 5 sec
client.println();
client.println("<!DOCTYPE HTML>");
client.println("<head><title>WiFi Sensor</title></head>");
client.println("<center><hr/><p> Click the Buttons to view the charge point. <p/><hr/></center>");
client.println("<center><input type=button value='Detect' onmousedown=location.href='/?DETECT'></center><hr/>");
if (distance<= 200) {
client.println("<center><hr/><p> Occupied. <p/><hr/></center>");
} else {
client.println("<center><hr/><p> Unoccupied. <p/><hr/></center>");
}
client.println("<hr/>");
client.println("</body>");
client.println("</html>");
break;
}
if (c == '\n') {
// you're starting a new line
currentLineIsBlank = true;
}
else if (c != '\r') {
// you've gotten a character on the current line
currentLineIsBlank = false;
}
}
}
// give the web browser time to receive the data
delay(1);
// close the connection:
client.stop();
if (readString.indexOf("/?DETECT") > 0) {
Serial.println();
Serial.println("DETECT");
Serial.println();
detect();
}
readString = "";// Clearing string for next read
Serial.println("client disconnected");
}
}
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");
}
void detect(void) {
distance=calculateDistance();
delay(5);
Serial.print("Distance:");
Serial.print(distance);
Serial.println(" cm");
}
int calculateDistance()
{
digitalWrite(trigPin,LOW);
delayMicroseconds(2);
digitalWrite(trigPin,HIGH);
delayMicroseconds(10);
digitalWrite(trigPin,LOW);
duration=pulseIn(echoPin,HIGH);
distance=duration*0.034/2;
return distance;
}
Nothing showed on my computer. Anything wrong?