Help needed with browser switch project with nrf24l01 and servo

Hi Thomas,

You have created a serial interface for debugging, but not used it.

If you think the problem is in the transmission unit code then you can use the serial interface to pass debug information to understand

where the code execution has reached and the value of key variables to see where the code begins to deviate from expected behaviour.

Sometimes even an LED can be useful to understand code flow, but you've got a serial interface you could be using.,

The demo examples from the Ethernet2 library contain Serial debug, so you can see from those how to go about this.

https://github.com/adafruit/Ethernet2/blob/master/examples/WebServer/WebServer.ino

Hi Thomas,

You have created a serial interface for debugging, but not used it.

If you think the problem is in the transmission unit code then you can use the serial interface to pass debug information to understand

where the code execution has reached and the value of key variables to see where the code begins to deviate from expected behaviour.

Sometimes even an LED can be useful to understand code flow, but you've got a serial interface you could be using.,

The demo examples from the Ethernet2 library contain Serial debug, so you can see from those how to go about this.

https://github.com/adafruit/Ethernet2/blob/master/examples/WebServer/WebServer.ino

Thanks for the advice. I have modified codes of both the transmitting and recieving units since. To better determine the cause of the issue, I've also changed the output of the recieving unit to a blinking LED instead of a servo. I've ran a serial debug of the transmitting unit and it appears that the recieving unit is able to sent the data as seen by the serial input 'Sent' when the web browser button is clicked on. However, the recieving unit does not seem to recieve the data. Again, I ran the serial debug on this end and it seems that it stops at the point when the radio coding interface kicks in. Can anyone help me identify the error in my code?

Transmitting unit

#include <SPI.h>

#include "RF24.h"

#include <Ethernet2.h>

int msg[1];

RF24 radio(9,10);

const uint64_t pipe = 0xE8E8F0F0E1LL;

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };

byte ip[] =  { 192,168,1,101 };

const int MAX_PAGENAME_LEN = 8; // max characters in page name

char buffer[MAX_PAGENAME_LEN+1]; // additional character for terminating null

EthernetServer server(232);

void setup()

{

  Serial.begin(9600); //Start serial port for debugging

  radio.begin();

  radio.openWritingPipe(pipe);

  Ethernet.begin(mac, ip);

  server.begin();

  delay(2000);

}

void loop()

{

  EthernetClient client = server.available();

  if (client) {

    int type = 0;

    while (client.connected()) {

        if (client.available()) {

        // GET, POST, or HEAD 

        memset(buffer,0, sizeof(buffer)); // clear the buffer

        if(client.readBytesUntil('/', buffer,sizeof(buffer))){

          if(strcmp(buffer,"POST ") == 0){

            client.find("\n\r"); // skip to the body

            // find string starting with "pin", stop on first blank line

            // the POST parameters expected in the form pinDx=Y

            // where x is the pin number and Y is 0 for LOW and 1 for HIGH

            while(client.findUntil("pinD", "\n\r")){

              int pin = client.parseInt();       // the pin number

              int val = client.parseInt();       // 0 or 1

              pinMode(pin, OUTPUT);

              Serial.println(pin);

              Serial.println(OUTPUT);

              if (OUTPUT == 1) {

              msg[0] = 111; //Send the 111 to the reciever

              radio.write(msg, 1);

              Serial.println("Sent"); //This works

              }

          }

          }

          sendHeader(client,"Post example");

          //Control of Servo

          client.print(

          "<form action='/' method='POST'><p><input type='hidden' name='pinD7'");

          client.println(" value='1'><input type='submit' value='Servo Right'/></form>");

          client.println("</body></html>");

          client.stop();

        }

      }

    }

    // give the web browser time to receive the data

    delay(1);

    client.stop();

  }

}

void sendHeader(EthernetClient client, char *title)

{

  // send a standard http response header

  client.println("HTTP/1.1 200 OK");

  client.println("Content-Type: text/html");

  client.println();

  client.print("<html><head><title>");

  client.print(title);

  client.println("</title><body>");

}

Recieving unit

#include  <SPI.h>

#include <nRF24L01.h>

#include <RF24.h>

int msg[1];

RF24 radio(9,10); // NRF24L01 Pin

const uint64_t pipe = 0xE8E8F0F0E1LL; //Start Pipe Communication Address

int led=3;

void setup()

{

Serial.begin(9600);

radio.begin();

radio.openReadingPipe(1,pipe);

radio.startListening();

  pinMode(led, OUTPUT);

}

void loop(void){

   Serial.println("Hello"); //Successful serial print stops at this point until serial error message at the end

if (radio.available()){

   bool done = false;   

   while (!done){

     done = radio.read(msg, 1);     

     Serial.println(msg[0]);

     if (msg[0] == 111)

     {digitalWrite(led, HIGH);   // turn the LED on (HIGH is the voltage level)

      Serial.println("Data recieved");

      delay(3000);              // wait for a second

      digitalWrite(led, LOW);    // turn the LED off by making the voltage LOW

       delay(1000);              // wait for a second

      }

     else

     delay(10);}}

else{Serial.println("Error: No Radio Transmission");}}