constexpr uint8_t LDR_PIN = 34;
uint32_t sampleNumber = 0;
char condition[16] = "STARTUP";

void readConditionCommand() {
  if (!Serial.available()) return;
  String label = Serial.readStringUntil('\n');
  label.trim();
  if (label.length() > 0 && label.length() < sizeof(condition)) {
    label.toUpperCase();
    label.toCharArray(condition, sizeof(condition));
    Serial.printf("CHANGE note=%s retest-required=yes\n", condition);
  }
}

void setup() {
  Serial.begin(115200);
  analogReadResolution(12);
  Serial.println("LDR LAB scope=direction-only reference=none");
  Serial.println("QUESTION does-light-change-move-the-recorded-signal");
}

void loop() {
  readConditionCommand();
  const int raw = analogRead(LDR_PIN);
  const float voltage = raw * 3.3f / 4095.0f;
  const bool valid = raw >= 0 && raw <= 4095;
  sampleNumber++;
  Serial.printf("EVIDENCE n=%lu id=ldr state=%s raw=%dcount V=%.3f valid=%c\n",
                sampleNumber, condition, raw, voltage, valid ? 'Y' : 'N');
  delay(500);
}