Hi all,
Have the below script, which allows the user to change LED Strip colours from any browser by setting the Uno and wifi shield up as a server and works well, however there's quite a degree of latency between entering these values into a URL and the lights changing.
URL format will be something like:
http://192.168.0.125/?setLed=010,010,010
Anyone got any tips on how I can speed up the response times here?
/*
*/
#include <SPI.h>
#include <WiFi.h>
char ssid[] = "xxx"; // your network SSID (name)
char pass[] = "xxx"; // your network password
int keyIndex = 0; // your network key Index number (needed only for WEP)
int status = WL_IDLE_STATUS;
String HTTP_req;
/// LED PIN - START
//pin definitions. must be PWM-capable pins!
const int redPin = 5;
const int greenPin = 6;
const int bluePin = 3;
//maximum duty cycle to be used on each led for color balancing.
//if "white" (R=255, G=255, B=255) doesn't look white, reduce the red, green, or blue max value.
const int max_red = 255;
const int max_green = 255;
const int max_blue = 255;
int red = 0;
int blue = 0;
int green = 0;
// LED PIN - END
WiFiServer server(80);
void setup() {
//Initialize serial and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}
// LED PIN SETUP - START
//set all three of our led pins to output
pinMode(redPin, OUTPUT);
pinMode(greenPin, OUTPUT);
pinMode(bluePin, OUTPUT);
// LED PIN SETUP - END
// 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 Network: ");
Serial.println(ssid);
// Connect to WPA/WPA2 network. Change this line if using open or WEP network:
status = WiFi.begin(ssid, pass);
// wait 3 seconds for connection:
delay(10000);
}
server.begin();
// you're connected now, so print out the status:
printWifiStatus();
}
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();
HTTP_req += 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: 3"); // refresh the page automatically every 5 sec
client.println();
client.println("<!DOCTYPE HTML>");
client.println("<html>");
// output the value of each analog input pin
client.println("<body>");
client.println("<h1>Odious LED Light Server</h1>");
client.println("<p>I'm connected and awaiting your command, master...</p>");
client.println("</body>");
client.println("</html>");
// LED SET - START
// read HTTP Request for LED colour settings
if (HTTP_req.indexOf("setLed=") > -1) { // see if checkbox was clicked
Serial.print("LED Command Detected: ");
// work out first index position
String tempRed = HTTP_req.substring(HTTP_req.indexOf("setLed=")+10,13);
String tempGreen = HTTP_req.substring(HTTP_req.indexOf("setLed=")+14,17);
String tempBlue = HTTP_req.substring(HTTP_req.indexOf("setLed=")+18,21);
//convert the value for RED to an Integer
int redLEDValue;
char carray[6];
tempRed.toCharArray(carray, sizeof(carray));
redLEDValue = atoi(carray);
//convert the value for GREEN to an Integer
int greenLEDValue;
tempGreen.toCharArray(carray, sizeof(carray));
greenLEDValue = atoi(carray);
//convert the value for BLUE to an Integer
int blueLEDValue;
tempBlue.toCharArray(carray, sizeof(carray));
blueLEDValue = atoi(carray);
Serial.println(redLEDValue);
Serial.println(greenLEDValue);
Serial.println(blueLEDValue);
red= redLEDValue;
green= greenLEDValue;
blue= blueLEDValue;
}
else{
Serial.print("No LED Values");
}
//map Colour values
red = map(red, 0, 255, 0, max_red);
blue = map(blue, 0, 255, 0, max_blue);
green = map(green, 0, 255, 0, max_green);
//set the three PWM pins according to the data read from the Serial port
//we also scale the values with map() so that the R, G, and B brightnesses are balanced.
analogWrite(redPin, red);
analogWrite(greenPin, green);
analogWrite(bluePin, blue);
// LED SET - END
HTTP_req = "";
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();
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");
}
