Skip to content

Instantly share code, notes, and snippets.

@igrr
Last active February 5, 2021 15:21
Show Gist options
  • Save igrr/3b66292cf8708770f76b to your computer and use it in GitHub Desktop.
Save igrr/3b66292cf8708770f76b to your computer and use it in GitHub Desktop.
#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>
const char* ssid = "..............";
const char* password = "................";
String form = "<form action='led'><input type='radio' name='state' value='1' checked>On<input type='radio' name='state' value='0'>Off<input type='submit' value='Submit'></form>";
String imagepage = "<img src='/led.png'>";
// This is a png file (led.png)
const char image[] = {
0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a, 0x00, 0x00, 0x00, 0x0d, 0x49, 0x48, 0x44, 0x52,
0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x10, 0x08, 0x02, 0x00, 0x00, 0x00, 0x90, 0x91, 0x68,
0x36, 0x00, 0x00, 0x00, 0x01, 0x73, 0x52, 0x47, 0x42, 0x00, 0xae, 0xce, 0x1c, 0xe9, 0x00, 0x00,
0x00, 0x04, 0x67, 0x41, 0x4d, 0x41, 0x00, 0x00, 0xb1, 0x8f, 0x0b, 0xfc, 0x61, 0x05, 0x00, 0x00,
0x00, 0x20, 0x63, 0x48, 0x52, 0x4d, 0x00, 0x00, 0x7a, 0x26, 0x00, 0x00, 0x80, 0x84, 0x00, 0x00,
0xfa, 0x00, 0x00, 0x00, 0x80, 0xe8, 0x00, 0x00, 0x75, 0x30, 0x00, 0x00, 0xea, 0x60, 0x00, 0x00,
0x3a, 0x98, 0x00, 0x00, 0x17, 0x70, 0x9c, 0xba, 0x51, 0x3c, 0x00, 0x00, 0x00, 0x18, 0x74, 0x45,
0x58, 0x74, 0x53, 0x6f, 0x66, 0x74, 0x77, 0x61, 0x72, 0x65, 0x00, 0x50, 0x61, 0x69, 0x6e, 0x74,
0x2e, 0x4e, 0x45, 0x54, 0x20, 0x76, 0x33, 0x2e, 0x33, 0x36, 0xa9, 0xe7, 0xe2, 0x25, 0x00, 0x00,
0x00, 0x57, 0x49, 0x44, 0x41, 0x54, 0x38, 0x4f, 0x95, 0x52, 0x5b, 0x0a, 0x00, 0x30, 0x08, 0x6a,
0xf7, 0x3f, 0xf4, 0x1e, 0x14, 0x4d, 0x6a, 0x30, 0x8d, 0x7d, 0x0d, 0x45, 0x2d, 0x87, 0xd9, 0x34,
0x71, 0x36, 0x41, 0x7a, 0x81, 0x76, 0x95, 0xc2, 0xec, 0x3f, 0xc7, 0x8e, 0x83, 0x72, 0x90, 0x43,
0x11, 0x10, 0xc4, 0x12, 0x50, 0xb6, 0xc7, 0xab, 0x96, 0xd0, 0xdb, 0x5b, 0x41, 0x5c, 0x6a, 0x0b,
0xfd, 0x57, 0x28, 0x5b, 0xc2, 0xfd, 0xb2, 0xa1, 0x33, 0x28, 0x45, 0xd0, 0xee, 0x20, 0x5c, 0x9a,
0xaf, 0x93, 0xd6, 0xbc, 0xdb, 0x25, 0x56, 0x61, 0x01, 0x17, 0x12, 0xae, 0x53, 0x3e, 0x66, 0x32,
0xba, 0x00, 0x00, 0x00, 0x00, 0x49, 0x45, 0x4e, 0x44, 0xae, 0x42, 0x60, 0x82
};
// HTTP server will listen at port 80
ESP8266WebServer server(80);
const int led = 13;
void handle_adc() {
float val = analogRead(0);
server.send(200, "text/plain", String(val));
}
void handle_led() {
// get the value of request argument "state" and convert it to an int
int state = server.arg("state").toInt();
digitalWrite(led, state);
server.send(200, "text/plain", String("LED is now ") + ((state)?"on":"off"));
}
void handle_image() {
server.send(200, "image/png", "");
WiFiClient client = server.client();
client.write(image, sizeof(image));
}
void handle_webpage_with_image() {
server.send(200, "text/html", imagepage);
}
void setup(void) {
Serial.begin(115200);
Serial.println("");
pinMode(led, OUTPUT);
// Connect to WiFi network
WiFi.begin(ssid, password);
// Wait for connection
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.print("Connected to ");
Serial.println(ssid);
Serial.print("IP address: ");
Serial.println(WiFi.localIP());
// Set up the endpoints for HTTP server
//
// Endpoints can be written as inline functions:
server.on("/", [](){
server.send(200, "text/html", form);
});
// And as regular external functions:
server.on("/adc", handle_adc);
server.on("/led", handle_led);
server.on("/led.png", handle_image);
server.on("/showled", handle_webpage_with_image);
// Start the server
server.begin();
Serial.println("HTTP server started");
}
void loop(void) {
// check for incomming client connections frequently in the main loop:
server.handleClient();
}
@pdfelen
Copy link

pdfelen commented Oct 27, 2016

You can download a conversion tool from this link:
http://www.codeproject.com/Tips/845393/Convert-a-Binary-File-to-a-Hex-Encoded-Text-File

I can confirm that 'server.send_P()' as suggested by dorin-sima works fine in edge (windows 10), firefox (windows 10, android), chrome (android)

Thanks for this post!

@linhtrucyeudoi
Copy link

server.send(200, "text/plain", "This is an index page.");
I don't know what is "200" mean
Please help me to understand

@proclaim
Copy link

200 is a http response code, here's more info:
https://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html

@mnabergoj
Copy link

Solo funciona de esta manera:
void handle_image() {
WiFiClient client = server.client();
client.write(image, sizeof(image));
server.send(200, "image/png", "");
}
Este orden esta chekeado al 2018. Muchas Gracias

@panguitou
Copy link

void handle_image() {
server.send_P(200, "image/png", image, sizeof(image));
}

Great Dorin-Sima !
You fix it !
Thanks so much !

Tested on Geekcreit ESP8266, with board as Wemos D1 R1 (led pin is gpio4)

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment