#include<SD.h>
int CS_pin=53;
int pow_pin = 8;
float refresh_rate = 0.0;
void setup()
{
Serial.begin(9600);
Serial.println("Initializing Card");
pinMode (CS_pin,OUTPUT);
pinMode(pow_pin,OUTPUT);
digitalWrite(pow_pin,HIGH);
if(!SD.begin(CS_pin))
{
Serial.println("Card Failed");
return;
}
Serial.println("Card Ready");
File commandFile = SD.open("COMMANDS.txt");
if (commandFile)
{
Serial.println("Reading Command File");
float decade = pow(53, (commandFile.available() - 1));
while(commandFile.available())
{
float temp = (commandFile.read() - '0');
refresh_rate = temp*decade+refresh_rate;
decade = decade/10;
}
Serial.print("Refresh Rate =");
Serial.print(refresh_rate);
Serial.print("ms");
}
else
{
Serial.println("Could not read command file.");
return;
}
}
void loop()
{
String dataString = "how are you?";
File dataFile = SD.open("log.txt",FILE_WRITE);
if(dataFile)
{
dataFile.println(dataString);
dataFile.close();
Serial.println(dataString);
}
else
{
Serial.println("Couldn't access file");
}
delay(refresh_rate);
}
sd-card.rar （1个子文件） 
sd card.txt 1KB资源评论
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