Comments on: NodeMCU Ajax: Dynamic Sensor Data on Web Page

By: Pritish Chavan

Pritish Chavan — Mon, 27 Jul 2020 05:39:08 +0000

server.on("/", [](){ page = "Sensor to Node MCU Web ServerData: ""\r\n"; page += "\r\n"; page += "var x = setInterval(function() {loadData(\"data.txt\",updateData)}, 1000);\r\n"; page += "function loadData(url, callback){\r\n"; page += "var xhttp = new XMLHttpRequest();\r\n"; page += "xhttp.onreadystatechange = function(){\r\n"; page += " if(this.readyState == 4 && this.status == 200){\r\n"; page += " callback.apply(xhttp);\r\n"; page += " }\r\n"; page += "};\r\n"; page += "xhttp.open(\"GET\", url, true);\r\n"; page += "xhttp.send();\r\n"; page += "}\r\n"; page += "function updateData(){\r\n"; page += " document.getElementById(\"data\").innerHTML = this.responseText;\r\n"; page += "}\r\n"; page += "\r\n"; server.send(200, "text/html", page); }); In this function i want to put id value in array format is there possible or not. if possible then how to write a statment page = "Sensor to Node MCU Web ServerData: ""\r\n";

By: Roland Pelayo

Roland Pelayo — Tue, 26 May 2020 03:07:56 +0000

In reply to Joe Bauer. Thanks! Will create a tutorial for that soon

By: Joe Bauer

Joe Bauer — Fri, 22 May 2020 04:59:41 +0000

Thanks for this project. How is it possible to add an input field? I would like to be able to adjust the threshold value for my 'Smoke Alarm' project for my wife. Is there project that shows how to add an interger field?

By: Roland Pelayo

Roland Pelayo — Wed, 15 May 2019 03:57:48 +0000

In reply to Gibran Berriel. Yes, you can check my post: NodeMCU weather device for an example on how to graph data from sensors.

By: Gibran Berriel

Gibran Berriel — Wed, 01 May 2019 15:40:23 +0000

Es posible graficar los resultados directamente desde el nodemcu?
Is it possible to graph the results directly from the nodemcu?

By: Roland Pelayo

Roland Pelayo — Fri, 08 Feb 2019 06:25:28 +0000

In reply to Aditi Agrawal. Hi, It looks like a formatting concern. Have you tried toggling to plain code? Click the "<>" on the upper right.

By: Aditi Agrawal

Aditi Agrawal — Fri, 08 Feb 2019 05:55:52 +0000

Hii I have been trying this code but I got this error. Arduino: 1.8.8 (Windows 10), Board: "NodeMCU 1.0 (ESP-12E Module), 80 MHz, Flash, Disabled, 4M (no SPIFFS), v2 Lower Memory, Disabled, None, Only Sketch, 115200" nodemcu_server:8:1: error: stray '\302' in program ESP8266WebServer server(80); Â Â //instantiate server at port 80 (http port) ^ nodemcu_server:8:1: error: stray '\240' in program nodemcu_server:8:1: error: stray '\302' in program nodemcu_server:8:1: error: stray '\240' in program nodemcu_server:15:1: error: stray '\302' in program Â pinMode(A0, INPUT); ^ nodemcu_server:15:1: error: stray '\240' in program nodemcu_server:16:1: error: stray '\302' in program Â delay(1000); ^ nodemcu_server:16:1: error: stray '\240' in program nodemcu_server:17:1: error: stray '\302' in program Â Serial.begin(115200); ^ nodemcu_server:17:1: error: stray '\240' in program nodemcu_server:18:1: error: stray '\302' in program Â WiFi.begin(ssid, password); //begin WiFi connection ^ nodemcu_server:18:1: error: stray '\240' in program nodemcu_server:19:1: error: stray '\302' in program Â Serial.println(""); ^ nodemcu_server:19:1: error: stray '\240' in program nodemcu_server:21:1: error: stray '\302' in program Â // Wait for connection ^ nodemcu_server:21:1: error: stray '\240' in program nodemcu_server:22:1: error: stray '\302' in program Â while (WiFi.status() != WL_CONNECTED) { ^ nodemcu_server:22:1: error: stray '\240' in program nodemcu_server:23:1: error: stray '\302' in program Â delay(500); ^ nodemcu_server:23:1: error: stray '\240' in program nodemcu_server:24:1: error: stray '\302' in program Â Serial.print("."); ^ nodemcu_server:24:1: error: stray '\240' in program nodemcu_server:27:1: error: stray '\302' in program Â Serial.println(""); ^ nodemcu_server:27:1: error: stray '\240' in program nodemcu_server:28:1: error: stray '\302' in program Â Serial.print("Connected to "); ^ nodemcu_server:28:1: error: stray '\240' in program nodemcu_server:29:1: error: stray '\302' in program Â Serial.println(ssid); ^ nodemcu_server:29:1: error: stray '\240' in program nodemcu_server:30:1: error: stray '\302' in program Â Serial.print("IP address: "); ^ nodemcu_server:30:1: error: stray '\240' in program nodemcu_server:31:1: error: stray '\302' in program Â Serial.println(WiFi.localIP()); ^ nodemcu_server:31:1: error: stray '\240' in program nodemcu_server:32:1: error: stray '\302' in program Â server.on("/data.txt", [](){ ^ nodemcu_server:32:1: error: stray '\240' in program nodemcu_server:33:1: error: stray '\302' in program Â text = (String)data; ^ nodemcu_server:33:1: error: stray '\240' in program nodemcu_server:34:1: error: stray '\302' in program Â Â Â server.send(200, "text/html", text); ^ nodemcu_server:34:1: error: stray '\240' in program nodemcu_server:34:1: error: stray '\302' in program nodemcu_server:34:1: error: stray '\240' in program nodemcu_server:34:1: error: stray '\302' in program nodemcu_server:34:1: error: stray '\240' in program nodemcu_server:35:1: error: stray '\302' in program Â }); ^ nodemcu_server:35:1: error: stray '\240' in program nodemcu_server:36:1: error: stray '\302' in program Â server.on("/", [](){ ^ nodemcu_server:36:1: error: stray '\240' in program nodemcu_server:54:2: error: stray '\302' in program Â Â server.send(200, "text/html", page); ^ nodemcu_server:54:2: error: stray '\240' in program nodemcu_server:54:2: error: stray '\302' in program nodemcu_server:54:2: error: stray '\240' in program nodemcu_server:57:1: error: stray '\302' in program Â server.begin(); ^ nodemcu_server:57:1: error: stray '\240' in program nodemcu_server:58:1: error: stray '\302' in program Â Serial.println("Web server started!"); ^ nodemcu_server:58:1: error: stray '\240' in program nodemcu_server:62:1: error: stray '\302' in program Â data = analogRead(A0); ^ nodemcu_server:62:1: error: stray '\240' in program nodemcu_server:63:1: error: stray '\302' in program Â delay(1000); ^ nodemcu_server:63:1: error: stray '\240' in program nodemcu_server:64:1: error: stray '\302' in program Â server.handleClient(); ^ nodemcu_server:64:1: error: stray '\240' in program exit status 1 stray '\302' in program I tried toggling line code but I still got the same error. Can You please help me fix this. Thank you.

By: Jan

Jan — Wed, 28 Nov 2018 19:24:50 +0000

In reply to Roland Pelayo. Hi, i changed the code for 3 sensors and its working. The issue i have is: The Sensor values are displayed in one row. I have no idea how to get a carriage return in HTML to have each sensor value in a single row. Can you help?

By: Jhaxe

Jhaxe — Mon, 19 Nov 2018 10:07:07 +0000

how to do if 2 or more analog sensor? thanks..

By: Anoop

Anoop — Tue, 30 Oct 2018 11:04:44 +0000

How can we do for two analog sensors , provided it has only one analog pin ..? Please help .