Memory Optimization

// You can afford to enable many modules
#define ENABLE_SENSOR_MODULE_V2
#define ENABLE_SENSOR_BME680_V2
#define ENABLE_SENSOR_DHT_V2
#define ENABLE_SENSOR_ANALOG_V2
#define ENABLE_MODULE_WIFI_HANDLER_V2
#define ENABLE_MODULE_MQTT_MANAGER
#define ENABLE_MODULE_FIREBASE_RTDB_V3
#define ENABLE_MODULE_PID_CONTROLLER
#define ENABLE_MODULE_FUZZY_MAMDANI
#define ENABLE_MODULE_SD_CARD_MODULE_ESP32
#define ENABLE_MODULE_FREE_RTOS_HANDLER
#include "Kinematrix.h"

// Estimated usage: ~350KB Flash, ~120KB RAM
// Still plenty of room left!

// Be selective - RAM is the constraint
#define ENABLE_SENSOR_MODULE_V2
#define ENABLE_SENSOR_DHT_V2
#define ENABLE_MODULE_WIFI_HANDLER_V2
#define ENABLE_MODULE_MQTT_MANAGER
#define ENABLE_MODULE_MOVING_AVERAGE_FILTER
#include "Kinematrix.h"

// Estimated usage: ~180KB Flash, ~45KB RAM
// Comfortable fit with room for runtime data

// Extreme minimalism required
#define ENABLE_SENSOR_ANALOG_V2
#define ENABLE_MODULE_MOVING_AVERAGE_FILTER
#include "Kinematrix.h"

// Estimated usage: ~8KB Flash, ~400 bytes RAM
// Very tight fit - test thoroughly!

#define ENABLE_SENSOR_MODULE_V2
#define ENABLE_SENSOR_BME680_V2
#define ENABLE_MODULE_SERIAL_DEBUGGER_LITE
#include "Kinematrix.h"

SensorModuleV2 sensors;
BME680SensV2 environmental;

void setup() {
    Serial.begin(115200);
    environmental.setUpdateInterval(5000);
    sensors.addSensor("env", &environmental);
    sensors.init();
}

void loop() {
    sensors.update();
    Serial.printf("Temp: %.2f°C\n", environmental.getTemperature());
    delay(1000);
}

#define ENABLE_SENSOR_MODULE_V2
#define ENABLE_SENSOR_DHT_V2
#define ENABLE_SENSOR_ANALOG_V2
#define ENABLE_MODULE_WIFI_HANDLER_V2
#define ENABLE_MODULE_MQTT_MANAGER
#define ENABLE_MODULE_DATETIME_NTP_V2
#define ENABLE_MODULE_MOVING_AVERAGE_FILTER
#include "Kinematrix.h"

// Multi-sensor WiFi node with MQTT

#define ENABLE_SENSOR_MODULE_V2
#define ENABLE_SENSOR_BME680_V2
#define ENABLE_SENSOR_DHT_V2
#define ENABLE_SENSOR_ANALOG_V2
#define ENABLE_MODULE_WIFI_HANDLER_V2
#define ENABLE_MODULE_MQTT_MANAGER
#define ENABLE_MODULE_FIREBASE_RTDB_V3
#define ENABLE_MODULE_FIREBASE_FIRESTORE_V3
#define ENABLE_MODULE_SD_CARD_MODULE_ESP32
#define ENABLE_MODULE_PID_CONTROLLER
#define ENABLE_MODULE_FUZZY_MAMDANI
#define ENABLE_MODULE_FREE_RTOS_HANDLER
#define ENABLE_MODULE_OLED_MENU
#define ENABLE_MODULE_SERIAL_DEBUGGER_V2
#include "Kinematrix.h"

// Full-featured IoT hub with cloud, storage, and HMI

#define ENABLE_MODULE_I2C_SCANNER              // ~2KB
#define ENABLE_MODULE_SERIAL_HARD              // ~1KB
#define ENABLE_MODULE_MOVING_AVERAGE_FILTER    // ~2KB
#define ENABLE_MODULE_PID                      // ~4KB
#define ENABLE_SENSOR_ANALOG_V2                // ~3KB

#define ENABLE_MODULE_SERIAL_DEBUGGER_LITE     // ~8KB
#define ENABLE_MODULE_PID_CONTROLLER           // ~12KB
#define ENABLE_MODULE_FUZZY_MAMDANI            // ~15KB
#define ENABLE_MODULE_OLED_MENU                // ~18KB
#define ENABLE_SENSOR_MODULE_V2                // ~10KB
#define ENABLE_SENSOR_BME680_V2                // ~14KB

#define ENABLE_MODULE_WIFI_HANDLER_V2          // ~35KB
#define ENABLE_MODULE_MQTT_MANAGER             // ~45KB
#define ENABLE_MODULE_FIREBASE_RTDB_V3         // ~85KB
#define ENABLE_MODULE_FIREBASE_FIRESTORE_V3    // ~95KB
#define ENABLE_MODULE_SERIAL_DEBUGGER_V2       // ~25KB
#define ENABLE_ADDONS_AUTOLIGHT_V3             // ~120KB

// Heavy version (25KB)
#define ENABLE_MODULE_SERIAL_DEBUGGER_V2

// Lightweight version (8KB) - prefer this for constrained platforms
#define ENABLE_MODULE_SERIAL_DEBUGGER_LITE

// Heavy version (85KB)
#define ENABLE_MODULE_FIREBASE_RTDB_V3

// Lightweight alternative (45KB)
#define ENABLE_MODULE_MQTT_MANAGER  // Use MQTT instead of Firebase

// Development build - enable debugging
#ifdef DEBUG_BUILD
#define ENABLE_MODULE_SERIAL_DEBUGGER_V2
#endif

// Production build - no debugging overhead
#ifdef PRODUCTION_BUILD
#undef ENABLE_MODULE_SERIAL_DEBUGGER_V2
#endif

#include "Kinematrix.h"

// Bad: Enabling all sensors you might use
#define ENABLE_SENSOR_BME680_V2
#define ENABLE_SENSOR_DHT_V2
#define ENABLE_SENSOR_DS18B20
#define ENABLE_SENSOR_ANALOG_V2
#define ENABLE_SENSOR_MAX31865

// Good: Only enable sensors you're actually using
#define ENABLE_SENSOR_BME680_V2  // The one you need
#include "Kinematrix.h"

// During development - explore APIs without compiling everything
#define ENABLE_MODULE_NODEF_PID_CONTROLLER
#define ENABLE_MODULE_NODEF_MQTT_MANAGER
#include "KinematrixModulesNoDef.h"  // Headers only!

// For production - compile only what you use
#define ENABLE_MODULE_PID_CONTROLLER
#include "Kinematrix.h"

Sketch uses 245760 bytes (58%) of program storage space. Maximum is 419840 bytes.
Global variables use 42384 bytes (51%) of dynamic memory, leaving 39536 bytes for local variables. Maximum is 81920 bytes.

pio run --target upload

RAM:   [======    ]  52.1% (used 42780 bytes from 81920 bytes)
Flash: [=====     ]  58.5% (used 245760 bytes from 419840 bytes)

void setup() {
    Serial.begin(115200);
    
    #ifdef ESP32
    Serial.printf("Free heap: %d bytes\n", ESP.getFreeHeap());
    Serial.printf("Heap size: %d bytes\n", ESP.getHeapSize());
    #endif
    
    #ifdef ESP8266
    Serial.printf("Free heap: %d bytes\n", ESP.getFreeHeap());
    #endif
}

void loop() {
    // Monitor heap over time
    static unsigned long lastCheck = 0;
    if (millis() - lastCheck > 10000) {
        Serial.printf("Free heap: %d bytes\n", ESP.getFreeHeap());
        lastCheck = millis();
    }
}

// Bad: Wastes precious RAM
const char* errorMessages[] = {
    "Sensor initialization failed",
    "WiFi connection timeout",
    "MQTT broker unreachable"
};

// Good: Stores in Flash, not RAM
const char msg1[] PROGMEM = "Sensor initialization failed";
const char msg2[] PROGMEM = "WiFi connection timeout";
const char msg3[] PROGMEM = "MQTT broker unreachable";

const char* const errorMessages[] PROGMEM = {msg1, msg2, msg3};

// Bad: Copies string to RAM first
Serial.println("Temperature: ");

// Good: Reads directly from Flash
Serial.println(F("Temperature: "));

// Default - large buffers
MQTTManager mqtt;
mqtt.setBufferSize(2048);  // 2KB buffer

// Optimized - smaller buffers for constrained platforms
#ifdef ESP8266
mqtt.setBufferSize(512);   // 512 bytes - still functional
#endif