I have programmed ESP8266 with below program. I used USB to TTL convert to program ESP8266. This is how I wired my circuit:
USB TTL---------------- ESP8266 ESP-01
GND-----------------------GND
TX---------------------------RX
RX---------------------------TX
3.3V-----------------------VCC & CH_PD
GND------------GPIO0
#include <ESP8266WiFi.h>
const char* ssid = "shiv";//type your ssid
const char* password = "manmohan@12345";//type your password
WiFiServer server(80);
void setup() {
Serial.begin(115200);
delay(10);
// Connect to WiFi network
Serial.println();
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
// Start the server
server.begin();
Serial.println("Server started");
// Print the IP address
Serial.print("Use this URL to connect: ");
Serial.print("http://");
Serial.print(WiFi.localIP());
Serial.println("/");
}
void loop() {
// Check if a client has connected
WiFiClient client = server.available();
if (!client) {
return;
}
// Wait until the client sends some data
Serial.println("new client");
while(!client.available()){
delay(1);
}
// Read the first line of the request
String request = client.readStringUntil('\r');
Serial.println(request);
client.flush();
// Match the request
int value = LOW;
if (request.indexOf("/LED=ON") != -1) {
value = HIGH;
}
if (request.indexOf("/LED=OFF") != -1){
value = LOW;
}
// Return the response
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println(""); // do not forget this one
client.println("<!DOCTYPE HTML>");
client.println("<html>");
client.print("Led pin is now: ");
if(value == HIGH) {
client.print("On");
} else {
client.print("Off");
}
client.println("<br><br>");
client.println("Click <a href=\"/LED=ON\">here</a> turn the LED on pin 2 ON<br>");
client.println("Click <a href=\"/LED=OFF\">here</a> turn the LED on pin 2 OFF<br>");
client.println("</html>");
delay(1);
Serial.println("Client disonnected");
Serial.println("");
}
It was successful, here are the logs:
Archiving built core (caching) in: C:\Users\williams~1\AppData\Local\Temp\arduino_cache_375631\core\core_esp8266_esp8266_generic_CpuFrequency_80,FlashFreq_40,FlashMode_dio,UploadSpeed_115200,FlashSize_512K64,ResetMethod_ck,Debug_Disabled,DebugLevel_None_____feb0d75f3cf4e05271af4f91549cd009.a
Sketch uses 230073 bytes (52%) of program storage space. Maximum is 434160 bytes.
Global variables use 32376 bytes (39%) of dynamic memory, leaving 49544 bytes for local variables. Maximum is 81920 bytes.
Uploading 234224 bytes from C:\Users\williams~1\AppData\Local\Temp\arduino_build_189179/sketch_may14d.ino.bin to flash at 0x00000000
................................................................................ [ 34% ]
................................................................................ [ 69% ]
..................................................................... [ 100% ]
Once this was completed, I opened serial monitor and it was empty there, baud rate was 115200. It is weird, Isn't ?
I followed this tutorial https://create.arduino.cc/projecthub/ROBINTHOMAS/esp8266-esp-01-webserver-7248ca and on serial monitor it should be like below snapshot. What wrong I am doing ? Can anyone help me.
2 Answers 2
Tying GPIO0 to ground puts the ESP into programming mode, allowing you to flash it. To actually run the code, pull it high - that is, disconnect it from ground and connect a resistor (about 10k) between GPIO0 and +3.3v.
Do the same with RST.
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I disconnected GPIO0 to ground, then restarted Arduino software then selected port COM5 then open serial monitor then still same result .. here is my settings imgur.com/a/kT4kSN Sharma– N Sharma2017年05月20日 07:08:31 +00:00Commented May 20, 2017 at 7:08
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Here is serial monitor snapshot imgur.com/a/T4tXgN Sharma– N Sharma2017年05月20日 07:14:09 +00:00Commented May 20, 2017 at 7:14
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You might need to pull it high, as I explained in the answer. You might also need to pull RST high in the same way.Mark Smith– Mark Smith2017年05月20日 07:52:03 +00:00Commented May 20, 2017 at 7:52
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Thanks! I resolved it by connecting with Arduino, it worked :) +1N Sharma– N Sharma2017年05月20日 08:02:50 +00:00Commented May 20, 2017 at 8:02
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Could you explain what you did please, for my interest and for future reference?Mark Smith– Mark Smith2017年05月20日 08:04:19 +00:00Commented May 20, 2017 at 8:04
Thanks @Mark Smith. I used UART to flash new firmware to ESP8266. I connected Arduino and ESP8266 in this way to test ESP8266 new firmware:
Arduino ---------------- ESP8266 ESP-01
GND-----------------------GND
TX---------------------------TX
RX---------------------------RX
3.3V-----------------------VCC & CH_PD
Then I opened Serial Monitor on 115200 baud rate and it started to work as expected. Cheers!