Here I'm again: I try to switch a LED using an Arduino Nano V3 board, connected to an ESP-01 adapter with an ESP8266-shield.
The program doens't generates errors, but the ESP can't be initialized.
What do I wrong?
/*
Name WebServerLed-01.ino
Version: 01
WiFiEsp example:
Edited by: xxxxx
Modified: 2020-09-26
WHAT DOES THIS PROGRAM:
A simple web server that lets you turn on and of an LED via a web page.
This sketch will print the IP address of your ESP8266 module (once connected)
to the Serial monitor. From there, you can open that address in a web browser
to turn on and off the LED on pin 13.
For more details see: http://yaab-arduino.blogspot.com/p/wifiesp.html
HARDWARE:
- Arduino Nano V3
- ESP8266 shield with ESP-01 adapter
- RX of ESP-shield connected to Arduino Nano pin 6
- TX of ESP-shield connected to Arduino Nano pin 7
- VCC of ESP-shield connected to Arduino Nano 5V
- GND of ESP-shield connected to Arduino Nano GND
- Mini USB program cable
TESTED ON:
IDE 1.8.13 and Arduino Nano V3
*/
//====================
//Libraries
#include "WiFiEsp.h"
// Emulate Serial1 on pins 6/7 if not present
#ifndef HAVE_HWSERIAL1
#include "SoftwareSerial.h"
SoftwareSerial Serial1(6, 7); // RX, TX
#endif
char ssid[] = "yyy"; // your network SSID (name)
char pass[] = "zzzz"' // your network password
int status = WL_IDLE_STATUS;
int pinLED = 13;
int ledStatus = HIGH;
WiFiEspServer server(80);
// use a ring buffer to increase speed and reduce memory allocation
RingBuffer buf(8);
void setup()
{
pinMode(pinLED, OUTPUT); // initialize digital pin LED_BUILTIN as an output.
//Serial.begin(112000); // initialize serial for debugging, removed because it seems too fast
Serial.begin(9600); // initialize serial for debugging
Serial1.begin(9600); // initialize serial for ESP module
WiFi.init(&Serial1); // initialize ESP module
// 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 WPA SSID: ");
Serial.println(ssid);
// Connect to WPA/WPA2 network
status = WiFi.begin(ssid, pass);
}
Serial.println("You're connected to the network");
printWifiStatus();
// start the web server on port 80
server.begin();
}
void loop()
{
WiFiEspClient client = server.available(); // listen for incoming clients
if (client) { // if you get a client,
Serial.println("New client"); // print a message out the serial port
buf.init(); // initialize the circular buffer
while (client.connected()) { // loop while the client's connected
if (client.available()) { // if there's bytes to read from the client,
char c = client.read(); // read a byte, then
buf.push(c); // push it to the ring buffer
// printing the stream to the serial monitor will slow down
// the receiving of data from the ESP filling the serial buffer
//Serial.write(c);
// you got two newline characters in a row
// that's the end of the HTTP request, so send a response
if (buf.endsWith("\r\n\r\n")) {
sendHttpResponse(client);
break;
}
// Check to see if the client request was "GET /H" or "GET /L":
if (buf.endsWith("GET /H")) {
Serial.println("Turn led ON");
ledStatus = HIGH;
digitalWrite(pinLED, HIGH); // turn the LED on (HIGH is the voltage level)
}
else if (buf.endsWith("GET /L")) {
Serial.println("Turn led OFF");
ledStatus = LOW;
digitalWrite(pinLED, LOW); // turn the LED off by making the voltage LOW
}
}
}
// close the connection
client.stop();
Serial.println("Client disconnected");
}
}
void sendHttpResponse(WiFiEspClient client)
{
// HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
// and a content-type so the client knows what's coming, then a blank line:
client.println("HTTP/1.1 200 OK");
client.println("Content-type:text/html");
client.println();
// the content of the HTTP response follows the header:
client.print("The LED is ");
client.print(ledStatus);
client.println("
");
client.println("
");
client.println("Click <a href=\"/H\">here</a> turn the LED on
");
client.println("Click <a href=\"/L\">here</a> turn the LED off
");
// The HTTP response ends with another blank line:
client.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 where to go in the browser
Serial.println();
Serial.print("To see this page in action, open a browser to http://");
Serial.println(ip);
Serial.println();
}
Results from the monitor:
17:13:59.011 -> [WiFiEsp] Initializing ESP module
17:13:59.998 -> [WiFiEsp] >>> TIMEOUT >>>
17:14:01.999 -> [WiFiEsp] >>> TIMEOUT >>>
17:14:04.027 -> [WiFiEsp] >>> TIMEOUT >>>
17:14:06.024 -> [WiFiEsp] >>> TIMEOUT >>>
17:14:08.023 -> [WiFiEsp] >>> TIMEOUT >>>
17:14:09.036 -> [WiFiEsp] Cannot initialize ESP module
17:14:15.030 -> [WiFiEsp] >>> TIMEOUT >>>
17:14:15.030 -> [WiFiEsp] No tag found
17:14:15.064 -> WiFi shield not present
