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123 lines
3.1 KiB
Plaintext
123 lines
3.1 KiB
Plaintext
// A simple data logger for the Arduino analog pins
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#define LOG_INTERVAL 1000 // mills between entries
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#define SENSOR_COUNT 3 // number of analog pins to log
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#define ECHO_TO_SERIAL 1 // echo data to serial port
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#define WAIT_TO_START 1 // Wait for serial input in setup()
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#define SYNC_INTERVAL 1000 // mills between calls to sync()
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uint32_t syncTime = 0; // time of last sync()
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#include <SdFat.h>
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#include <SdFatUtil.h>
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Sd2Card card;
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SdVolume volume;
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SdFile root;
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SdFile file;
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// store error strings in flash to save RAM
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#define error(s) error_P(PSTR(s))
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void error_P(const char* str) {
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PgmPrint("error: ");
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SerialPrintln_P(str);
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if (card.errorCode()) {
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PgmPrint("SD error: ");
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Serial.print(card.errorCode(), HEX);
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Serial.print(',');
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Serial.println(card.errorData(), HEX);
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}
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while(1);
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}
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void setup(void) {
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Serial.begin(9600);
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Serial.println();
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#if WAIT_TO_START
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Serial.println("Type any character to start");
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while (!Serial.available());
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#endif //WAIT_TO_START
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// initialize the SD card at SPI_HALF_SPEED to avoid bus errors with
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// breadboards. use SPI_FULL_SPEED for better performance.
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if (!card.init(SPI_HALF_SPEED)) error("card.init failed");
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// initialize a FAT volume
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if (!volume.init(&card)) error("volume.init failed");
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// open root directory
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if (!root.openRoot(&volume)) error("openRoot failed");
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// create a new file
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char name[] = "LOGGER00.CSV";
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for (uint8_t i = 0; i < 100; i++) {
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name[6] = i/10 + '0';
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name[7] = i%10 + '0';
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if (file.open(&root, name, O_CREAT | O_EXCL | O_WRITE)) break;
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}
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if (!file.isOpen()) error ("file.create");
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Serial.print("Logging to: ");
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Serial.println(name);
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// write header
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file.writeError = 0;
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file.print("millis");
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#if ECHO_TO_SERIAL
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Serial.print("millis");
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#endif //ECHO_TO_SERIAL
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#if SENSOR_COUNT > 6
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#error SENSOR_COUNT too large
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#endif //SENSOR_COUNT
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for (uint8_t i = 0; i < SENSOR_COUNT; i++) {
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file.print(",sens");file.print(i, DEC);
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#if ECHO_TO_SERIAL
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Serial.print(",sens");Serial.print(i, DEC);
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#endif //ECHO_TO_SERIAL
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}
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file.println();
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#if ECHO_TO_SERIAL
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Serial.println();
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#endif //ECHO_TO_SERIAL
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if (file.writeError || !file.sync()) {
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error("write header failed");
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}
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}
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void loop(void) {
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// clear print error
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file.writeError = 0;
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delay((LOG_INTERVAL -1) - (millis() % LOG_INTERVAL));
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// log time
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uint32_t m = millis();
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file.print(m);
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#if ECHO_TO_SERIAL
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Serial.print(m);
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#endif //ECHO_TO_SERIAL
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// add sensor data
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for (uint8_t ia = 0; ia < SENSOR_COUNT; ia++) {
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uint16_t data = analogRead(ia);
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file.print(',');
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file.print(data);
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#if ECHO_TO_SERIAL
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Serial.print(',');
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Serial.print(data);
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#endif //ECHO_TO_SERIAL
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}
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file.println();
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#if ECHO_TO_SERIAL
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Serial.println();
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#endif //ECHO_TO_SERIAL
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if (file.writeError) error("write data failed");
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//don't sync too often - requires 2048 bytes of I/O to SD card
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if ((millis() - syncTime) < SYNC_INTERVAL) return;
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syncTime = millis();
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if (!file.sync()) error("sync failed");
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}
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