Environmental OLED and cloud logger

Firmware flow

How readings become environmental flags

Selected sensor acquisition and state checks.

Read the motion input, update readings from sensors marked ready, and combine no-motion with valid numeric light or temperature values to set the two threshold flags.

The flags describe possible conditions, not measured energy savings. The excerpt does not clear old values when a sensor is unavailable or test reading freshness; cloud reporting is outside it.

Read the implementation

sensor acquisition / state flags excerpt · selected source lines 413–430. Source inspection is not a hardware test.

  int pirRaw = digitalRead(PIR_PIN);
  bool motionDetected = (pirRaw == LOW);
  bool noMotion = !motionDetected;

  if (bmeOK) {
    temperatureC = bme.readTemperature();
    humidity = bme.readHumidity();
    pressureHpa = bme.readPressure() / 100.0F;
  }

  if (tslOK) {
    sensors_event_t event;
    tsl.getEvent(&event);
    lux = event.light;
  }

  bool emptyRoomLightOn = noMotion && !isnan(lux) && lux > LIGHT_ON_THRESHOLD_LUX;
  bool possibleHeatingWaste = noMotion && !isnan(temperatureC) && temperatureC > HIGH_TEMP_THRESHOLD_C;

Open the exact source-level diagram

ActionRead the motion inputA LOW input is treated as motion.

Next: Refresh environmental readings when enabled

ActionRefresh environmental readings when enabledRead temperature, humidity and pressure only when the environmental sensor is marked ready.

Next: Refresh the light reading when enabled

ActionRefresh the light reading when enabled

Next: Check no-motion and threshold conditions

ActionCheck no-motion and threshold conditionsUse numeric light and temperature values to set the two possible-waste flags.

Technical notes

OLED feedback

showOLEDMessage() provides local display feedback alongside acquisition and remote logging.

Network and logging configuration

wifiDetailsAdded() and sheetsUrlAdded() identify two setup responsibilities: connecting the logger to a network and assigning its spreadsheet endpoint. This makes the destination part of the device configuration.

Spreadsheet records

The project includes a spreadsheet view with environmental columns and timestamped rows. This complements the local display: one presents device feedback, while the other organises reported data for later inspection.