#include <MemoryFree.h>

int data1[100];
void setup(){
    Serial.begin(115200);
    data1[0] = 20;
}

void loop(){
    int *data2 = (int*)malloc(5);
    *data2 = 10;
    Serial.print("calculate : ");
    Serial.print(*data2/2);
    free(data2);
    Serial.print(" ");
    Serial.print("freeMemory()=");
    Serial.println(freeMemory());
    delay(500);
}