I got the project working by using a new Nano and new SD Card Adapter. Using the original Nano with a new SD Card Adapter output the same error, and using the original SD Card Adapter with a new Nano output the same error.
I think I fried both original pieces of equipment. I'll post pictures of my original set up tomorrow. I think the problem comes from how I was powering my set up... Is there a glaring error with doing the below to remotely power the Nano and SD Card Adapter? Maybe as battery voltage dropped, the current entering Nano and SD Card Adapter got too high?
I was running this code that I adapted from Starting Electronics and ArduinoReadWrite:
/*--------------------------------------------------------------
Program: volt_measure
Description: Reads value on analog input A2 and calculates
the voltage assuming that a voltage divider
network on the pin divides by 11.
Hardware: Arduino Uno with voltage divider on A2.
Software: Developed using Arduino 1.0.5 software
Should be compatible with Arduino 1.0 +
Date: 22 May 2013
Author: W.A. Smith, http://startingelectronics.org
--------------------------------------------------------------*/
#include <SPI.h> //SPI communication for SD card reader
#include <SD.h> //SD card functions
File myFile; //variable name for File
char fileName[] = "cap.txt"; //name SD card file here
// number of analog samples to take per reading
#define NUM_SAMPLES 10
int sumA2 = 0; // sum of samples taken
int sumA4 = 0;
unsigned char sample_count = 0; // current sample number
float voltage = 0.00; // calculated voltage
int n = 1; // keep measurement count
long timeNow;
void setup() {
//pinMode(10, OUTPUT);
//digitalWrite(10, HIGH);
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
Serial.print("Initializing SD card...");
if (!SD.begin(10)) {
Serial.println("initialization failed!");
return;
}
myFile = SD.open(fileName, FILE_WRITE);
// if the file opened okay, write to it:
if (myFile) {
myFile.print("Measurement Count, ");
myFile.print("Voltage (V), ");
myFile.println("Milliseconds");
// close the file:
myFile.close();
Serial.println("done.");
} else {
// if the file didn't open, print an error:
Serial.println("error opening file");
}
Serial.println("initialization done.");
}
void loop(){
// take a number of analog samples and add them up
while (sample_count < NUM_SAMPLES) {
sumA2 += analogRead(A2);
sumA4 += analogRead(A4);
sample_count++;
delay(10);
}
// calculate the voltage
// use 5.0 for a 5.0V ADC reference voltage
// 5.015V is the calibrated reference voltage
voltage = (((float)sumA4 - (float)sumA2) / (float)NUM_SAMPLES * 5.21 * 25.7 / 5.7) / 1024.0;
Serial.print(voltage);
Serial.println(" V");
// open the file. note that only one file can be open at a time,
// so you have to close this one before opening another.
myFile = SD.open(fileName, FILE_WRITE);
// if the file opened okay, write to it:
if (myFile) {
Serial.print("Writing to file...");
myFile.print(n);
myFile.print(", ");
myFile.print(voltage);
myFile.print(", ");
timeNow = millis();
myFile.println(timeNow);
// close the file:
myFile.close();
Serial.println("done.");
} else {
// if the file didn't open, print an error:
Serial.println("error opening file");
}
n++;
sample_count = 0;
sumA2 = 0;
sumA4 = 0;
}
