Hi guys
i am in a serious situation, i can't graduate if i don't get done with the datalogging...
so please, help , i very appreciate it
here is the case:
i am having a project that display a speed and record it
the former part is done, however, the later part is very difficult to me
i am trying to save the speed into the SDcard, don't need to read or copy, just write.
here is the code for the former part:
#define FREQ_PIN 3
#include <LiquidCrystal.h>
LiquidCrystal lcd(8, 9, 4, 5, 6, 7);
void setup() {
pinMode(FREQ_PIN, INPUT);
lcd.begin(16, 2);
}
void loop()
{
unsigned long t1 = pulseIn(FREQ_PIN, HIGH);// Time how long it takes to go HIGH again
unsigned long t2 = pulseIn(FREQ_PIN, LOW); // and how long it takes to go low again.
double t = t1 + t2;
double f = 1000000.0/t;
double w = 2 * 3.14 * f;
double v = w * 0.05;
lcd.setCursor(0,0);
lcd.println(v);
delay(2000);
}
Help please, I very very appreciate it.
i have the exactly the same circuit with this post, but i don't know how to write, thanks a lot
The code above is created by members, they are Pauls, Groove, AWOL and mem, i couldn't do this without their help, thanks a lot 