[问答]

esp8266和canvas仪表问题求解

问答对人有帮助，内容完整，我也想知道答案 0 大家好！终于有时间来攻击这个项目了。它包括从 Pot 收集数据（在 NodeMcu 上模拟读取），将数据传递到网页，然后在仪表上显示数据。有用！！！以下是 Sketch 的主要部分： Ino 代码：全选* Wifi-AP MODE * 07/11/2019 / #include #include #include //Include File System Headers const char htmlfile = "/index.html"; //WiFi Connection configuration const char ssid = "My Wifi"; const char password = "123456789"; 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); //sends data to server } 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 Detectednn"; 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 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"); Serial.print("Setting AP (Access Point)…"); Serial.println(); //Connect to wifi Network WiFi.mode(WIFI_AP); //Only Access point WiFi.softAP(ssid, password); //Start HOTspot //If connection successful show IP address in serial monitor Serial.print("Connected to: "); Serial.println(ssid); IPAddress IP = WiFi.softAPIP(); Serial.print("Server IP address: "); Serial.println(IP); //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(); Serial.println("HTTP server started"); } 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; } 这是 Index.html：代码：全选 Testing Gauges Testing Gauge 0
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