ESP8266 Community Forum

Posted: **Sat Jan 19, 2019 11:54 am**

Hi!
I'm New to the Forum,Read a lot so far.
Thanks to many guides and forums like this one, I was able to successfully have the Nodemcu control 1,2,3 Led's via the Web server page using wifi and my phone.
Learned also that every time I would toggle the ON/OFF buttons the page would refresh.

With that accomplished I would like to ask if its possible to add dynamic gauges to the page?
Is it possible to refresh the gauge as new data comes in?
Read on the net that google charts can do this but requires Internet. (correct me if I'm wrong)
can the gauges be used without internet.

Is there a guide for creating this gauges, or samples?

Thank you guys!

Posted: **Sat Jan 19, 2019 5:40 pm**

You probably want some JavaScript code - or Jquery. Searching the web I found this - https://canvas-gauges.com/

Posted: **Mon Jan 21, 2019 1:24 am**

Thank you for the link!
I also found this site:
https://circuits4you.com/2018/02/03/esp ... ial-gauge/
Guides you step by step on how to have your first gauges running!
and explain the full code!

I tried it and it Works!
with That said, brings me to another challenge.
the Sketch is aimed for Station mode.
I would like to recreate same results but with soft-AP mode.

here is the original code:

Code: Select all

 //ESP8266 SPIFFS HTML Web Page with JPEG, PNG Image
 
#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>
#include <FS.h>   //Include File System Headers
 
const char* htmlfile = "/index.html";
 
//WiFi Connection configuration
const char *ssid = "MyWifi";
const char *password = "password";
 
 
ESP8266WebServer server(80);
 
 
void handleADC(){
  int a = analogRead(A0);
  a = map(a,0,1023,0,100);
  String adc = String(a);
  Serial.println(adc);
  server.send(200, "text/plane",adc);
}
 
void handleRoot(){
  server.sendHeader("Location", "/index.html",true);   //Redirect to our html web page
  server.send(302, "text/plane","");
}
 
void handleWebRequests(){
  if(loadFromSpiffs(server.uri())) return;
  String message = "File Not Detected\n\n";
  message += "URI: ";
  message += server.uri();
  message += "\nMethod: ";
  message += (server.method() == HTTP_GET)?"GET":"POST";
  message += "\nArguments: ";
  message += server.args();
  message += "\n";
  for (uint8_t i=0; i<server.args(); i++){
    message += " NAME:"+server.argName(i) + "\n VALUE:" + server.arg(i) + "\n";
  }
  server.send(404, "text/plain", message);
  Serial.println(message);
}
 
void setup() {
  delay(1000);
  Serial.begin(115200);
  Serial.println();
 
  //Initialize File System
  SPIFFS.begin();
  Serial.println("File System Initialized");
 
  
  //Connect to wifi Network
  WiFi.begin(ssid, password);     //Connect to your WiFi router
  Serial.println("");
 
  // Wait for connection
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
 
  //If connection successful show IP address in serial monitor
  Serial.println("");
  Serial.print("Connected to ");
  Serial.println(ssid);
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());  //IP address assigned to your ESP
 
  //Initialize Webserver
  server.on("/",handleRoot);
  server.on("/getADC",handleADC); //Reads ADC function is called from out index.html
  server.onNotFound(handleWebRequests); //Set setver all paths are not found so we can handle as per URI
  server.begin();  
}
 
void loop() {
 server.handleClient();
}
 
bool loadFromSpiffs(String path){
  String dataType = "text/plain";
  if(path.endsWith("/")) path += "index.htm";
 
  if(path.endsWith(".src")) path = path.substring(0, path.lastIndexOf("."));
  else if(path.endsWith(".html")) dataType = "text/html";
  else if(path.endsWith(".htm")) dataType = "text/html";
  else if(path.endsWith(".css")) dataType = "text/css";
  else if(path.endsWith(".js")) dataType = "application/javascript";
  else if(path.endsWith(".png")) dataType = "image/png";
  else if(path.endsWith(".gif")) dataType = "image/gif";
  else if(path.endsWith(".jpg")) dataType = "image/jpeg";
  else if(path.endsWith(".ico")) dataType = "image/x-icon";
  else if(path.endsWith(".xml")) dataType = "text/xml";
  else if(path.endsWith(".pdf")) dataType = "application/pdf";
  else if(path.endsWith(".zip")) dataType = "application/zip";
  File dataFile = SPIFFS.open(path.c_str(), "r");
  if (server.hasArg("download")) dataType = "application/octet-stream";
  if (server.streamFile(dataFile, dataType) != dataFile.size()) {
  }
 
  dataFile.close();
  return true;
}

Posted: **Wed Jan 23, 2019 9:33 am**

[quote="Carlitos007"]Thank you for the link!
I also found this site:
https://circuits4you.com/2018/02/03/esp ... ial-gauge/
Guides you step by step on how to have your first gauges running!
and explain the full code!

I tried it and it Works!
with That said, brings me to another challenge.
the Sketch is aimed for Station mode.
I would like to recreate same results but with soft-AP mode.

Jquery is fairly large (by microcontoller standards) & I suspect the examples you cite merely point to it online somewhere.
You need to find some gauges which don't make calls to online resources if you want to use them in AP mode.
It's certainly possible. I've done it.

Ian

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