/* HocLapTrinhRobot G2 11 - Tao dashboard du lieu moi truong Board: ESP32-S3 DevKit Hardware: SHT31 I2C, LDR voltage divider, MQ-135 analog, LED status */ #include #include #include const char *WIFI_SSID = "TenMangWiFi"; const char *WIFI_PASSWORD = "MatKhauWiFi"; const char *DEVICE_ID = "g2-env-robot-01"; const int PIN_I2C_SDA = 8; const int PIN_I2C_SCL = 9; const int PIN_LDR = 4; const int PIN_MQ135 = 6; const int PIN_LED = 2; const uint8_t SHT31_ADDR = 0x44; const unsigned long SENSOR_INTERVAL_MS = 1000; const float EMA_ALPHA = 0.18f; WebServer server(80); unsigned long lastSensorMs = 0; int gasBaselineRaw = 1800; bool filtersReady = false; bool shtOk = false; float tempFiltered = 0.0f; float humFiltered = 0.0f; float lightFiltered = 0.0f; float airFiltered = 0.0f; uint8_t crc8(const uint8_t *data, int len) { uint8_t crc = 0xFF; for (int i = 0; i < len; i++) { crc ^= data[i]; for (int bit = 0; bit < 8; bit++) { crc = (crc & 0x80) ? (crc << 1) ^ 0x31 : (crc << 1); } } return crc; } bool readSht31(float &temperatureC, float &humidityPercent) { Wire.beginTransmission(SHT31_ADDR); Wire.write(0x24); Wire.write(0x00); if (Wire.endTransmission() != 0) return false; delay(20); if (Wire.requestFrom((int)SHT31_ADDR, 6) != 6) return false; uint8_t data[6]; for (int i = 0; i < 6; i++) data[i] = Wire.read(); if (crc8(data, 2) != data[2] || crc8(data + 3, 2) != data[5]) return false; uint16_t rawTemp = ((uint16_t)data[0] << 8) | data[1]; uint16_t rawHum = ((uint16_t)data[3] << 8) | data[4]; temperatureC = -45.0f + 175.0f * ((float)rawTemp / 65535.0f); humidityPercent = 100.0f * ((float)rawHum / 65535.0f); return true; } int readAnalogAverage(int pin, int sampleCount) { long total = 0; for (int i = 0; i < sampleCount; i++) { total += analogRead(pin); delay(2); } return total / sampleCount; } float constrainFloat(float value, float low, float high) { if (value < low) return low; if (value > high) return high; return value; } float lightPercentFromRaw(int raw) { return constrainFloat((raw / 4095.0f) * 100.0f, 0.0f, 100.0f); } float airScoreFromRaw(int raw) { return constrainFloat((raw - gasBaselineRaw) / 12.0f, 0.0f, 100.0f); } float updateEma(float previous, float sample, bool initialized) { if (!initialized) return sample; return previous + EMA_ALPHA * (sample - previous); } void readSensors() { float tempRaw = tempFiltered; float humRaw = humFiltered; shtOk = readSht31(tempRaw, humRaw); if (!shtOk && !filtersReady) { tempRaw = 0.0f; humRaw = 0.0f; } int ldrRaw = readAnalogAverage(PIN_LDR, 12); int mqRaw = readAnalogAverage(PIN_MQ135, 12); float lightRaw = lightPercentFromRaw(ldrRaw); float airRaw = airScoreFromRaw(mqRaw); tempFiltered = updateEma(tempFiltered, tempRaw, filtersReady); humFiltered = updateEma(humFiltered, humRaw, filtersReady); lightFiltered = updateEma(lightFiltered, lightRaw, filtersReady); airFiltered = updateEma(airFiltered, airRaw, filtersReady); filtersReady = true; } String buildJsonData() { String json = "{"; json += "\"device\":\"" + String(DEVICE_ID) + "\","; json += "\"uptime_ms\":" + String(millis()) + ","; json += "\"ip\":\"" + WiFi.localIP().toString() + "\","; json += "\"rssi\":" + String(WiFi.status() == WL_CONNECTED ? WiFi.RSSI() : 0) + ","; json += "\"sht_ok\":" + String(shtOk ? "true" : "false") + ","; json += "\"temperature_c\":" + String(tempFiltered, 2) + ","; json += "\"humidity_percent\":" + String(humFiltered, 2) + ","; json += "\"light_percent\":" + String(lightFiltered, 2) + ","; json += "\"air_score\":" + String(airFiltered, 2); json += "}"; return json; } String dashboardHtml() { String html = ""; html += ""; html += "G2 Environment Dashboard"; html += ""; html += "

G2 Environment Dashboard

"; html += "

Temperature

"; html += "

Humidity

"; html += "

Light

"; html += "

Air score

"; html += "

"; html += ""; return html; } void handleRoot() { server.send(200, "text/html", dashboardHtml()); Serial.println("web request=/"); } void handleApiData() { server.send(200, "application/json", buildJsonData()); Serial.println("web request=/api/data"); } void handleHealth() { server.send(200, "text/plain", "ok"); } void connectWifi() { WiFi.mode(WIFI_STA); WiFi.begin(WIFI_SSID, WIFI_PASSWORD); Serial.print("wifi connecting"); unsigned long started = millis(); while (WiFi.status() != WL_CONNECTED && millis() - started < 15000) { Serial.print("."); digitalWrite(PIN_LED, (millis() / 250) % 2 == 0 ? HIGH : LOW); delay(250); } Serial.println(); if (WiFi.status() == WL_CONNECTED) { digitalWrite(PIN_LED, HIGH); Serial.print("dashboard url=http://"); Serial.print(WiFi.localIP()); Serial.println("/"); } else { digitalWrite(PIN_LED, LOW); Serial.println("wifi failed; dashboard unavailable until reconnect"); } } void setupRoutes() { server.on("/", handleRoot); server.on("/api/data", handleApiData); server.on("/health", handleHealth); server.begin(); Serial.println("web server started"); } void setup() { Serial.begin(115200); delay(400); pinMode(PIN_LED, OUTPUT); digitalWrite(PIN_LED, LOW); analogReadResolution(12); Wire.begin(PIN_I2C_SDA, PIN_I2C_SCL); WiFi.persistent(false); WiFi.setSleep(false); Serial.println("G2 11 local dashboard ready"); connectWifi(); setupRoutes(); } void loop() { server.handleClient(); if (WiFi.status() == WL_CONNECTED) { digitalWrite(PIN_LED, HIGH); } else { digitalWrite(PIN_LED, (millis() / 500) % 2 == 0 ? HIGH : LOW); } unsigned long now = millis(); if (now - lastSensorMs >= SENSOR_INTERVAL_MS) { lastSensorMs = now; readSensors(); Serial.print("sensor sht="); Serial.print(shtOk ? "OK" : "ERR"); Serial.print(" temp="); Serial.print(tempFiltered, 1); Serial.print(" hum="); Serial.print(humFiltered, 1); Serial.print(" light="); Serial.print(lightFiltered, 1); Serial.print(" air="); Serial.println(airFiltered, 1); } }

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