#include #include #include ESP8266WebServer server(80); const int MAX_SAMPLES = 500; int samples[MAX_SAMPLES]; int sampleCount = 0; uint32_t batchNumber = 0; void handleRoot() { String html = R"rawliteral( ESP8266 Oscilloscope

Microphone Waveform

)rawliteral"; server.send(200, "text/html", html); } void handleJson() { JsonDocument doc; doc["batch"] = batchNumber; JsonArray arr = doc["values"].to(); for(int i = 0; i < sampleCount; i++) { arr.add(samples[i]); } String json; serializeJson(doc, json); server.send( 200, "application/json", json ); } void handleData() { String body = server.arg("plain"); JsonDocument doc; DeserializationError err = deserializeJson(doc, body); if(err) { Serial.print("JSON error: "); Serial.println(err.c_str()); server.send( 400, "text/plain", "Bad JSON" ); return; } JsonArray arr = doc["sensor0_reading"]; if(arr.isNull()) { server.send( 400, "text/plain", "Missing sensor0_reading" ); return; } sampleCount = min((int)arr.size(), MAX_SAMPLES); for(int i = 0; i < sampleCount; i++) { JsonVariant v = arr[i]; if(v.is()) { samples[i] = v["waarde"] | 0; } else { samples[i] = v | 0; } } batchNumber++; Serial.printf( "Received batch %lu (%d samples)\n", batchNumber, sampleCount ); server.send( 200, "text/plain", "OK" ); } void setup() { Serial.begin(115200); WiFi.softAP( "iPhone van Rolf", "ocean123" ); Serial.println(); Serial.println( "Access Point started" ); Serial.print("IP: "); Serial.println( WiFi.softAPIP() ); server.on( "/", HTTP_GET, handleRoot ); server.on( "/json", HTTP_GET, handleJson ); server.on( "/data", HTTP_POST, handleData ); server.begin(); Serial.println( "Web server started" ); } void loop() { server.handleClient(); }