arduino SD card saving to file

Question

Can anyone assist me with read/write to a SD shield. I am using a arduino along with a SD shield (POD uSD) I am using a ultrasonic sensor to measure a distance, it has a safety factor in it. It also measures the time a measurement was taken, I now need to save the data from the serial monitor to a file and send that file to a SD card. I cannot seem to solve the saving a file part along with the SD shield

I have wrote my code but can seem to implement the shield along with my code, I want to store my data onto a file on the SD card. I've reviewed the example provided in the library's but it won't work for me

My code is;

#define redled 10
#define greenled 11
#define echoPin 12
#define trigPin 13
unsigned long interval=60000; //interval = 60 seconds
unsigned long previoustime=0;
int minutes = 0; //global variables
void setup() {
 Serial.begin (9600); //Set Baud rate to 9600 to match serial monitor
 pinMode(trigPin, OUTPUT);
 pinMode(echoPin, INPUT);
 pinMode(greenled, OUTPUT);
 pinMode(redled, OUTPUT);
}
void loop() { 
 //----------------------------------------------------------- 
 unsigned long currenttime = millis(); //counts time in milliseconds and puts it into current time
 if ((currenttime-previoustime) >= interval) { //When time is greater 60 seconds
 previoustime = currenttime; //Make the previous time equalled to the minute to take away in the next if statement **Time since start section**
 minutes = minutes + 1; //Add 1 minute
 }
 unsigned long time = (currenttime-previoustime) / 1000; //converts the milliseconds to seconds
 //-----------------------------------------------------------
 long distance = ultra_sensor(); //call function that now returns the distance
 //-----------------------------------------------------------
 if (distance < 4) { // If distance is less than 4cm
 digitalWrite(redled,HIGH); // Turn on Red LED
 digitalWrite(greenled,LOW); // Turn off Green LED
 }
 else { //If distance is greater than 4cm
 digitalWrite(redled,LOW); // Turn off Red LED
 digitalWrite(greenled,HIGH); // Turn on Green LED
 }
 //----------------------------------------------------------- 
 if (distance >= 200 || distance <= 0){
 Serial.println("Out of range");
 }
 else {
 Serial.print(distance);
 Serial.print("cm");
 Serial.print(" after ");
 Serial.print(minutes); //Printing distance and time to serial monitor
 Serial.print(" minutes ");
 Serial.print("and "); 
 Serial.print(time);
 Serial.println(" seconds");
 }
 //-----------------------------------------------------------
 delay(2000); //Get reading every 2 seconds
}
long ultra_sensor() { //Ultrasonic sensor reading is now a function. More efficient
 digitalWrite(trigPin, LOW); //Set Trigger to idle
 delayMicroseconds(2); //Wait 2 microseconds
 digitalWrite(trigPin, HIGH); //Set Trigger to high which sends out a wave
 delayMicroseconds(10); //Send the wave for 10 microseconds
 digitalWrite(trigPin, LOW); //Turn the trigger to idle
 long duration = pulseIn(echoPin, HIGH); //make duration the wave that echo recieves back
 long dis = (duration/2) / 29.1; //divide by 2 for going there and back. ***Speed of sound***
 return dis; //Send the distance to function call
}

Answer 1

Looks like your sketch (pin usage) is in conflict with the SD shield (SPI pins). Try using other pins.