GR-PEACH Special Project: Working Out the Logger with the SD Card

With GR-PEACH, save the data in CSV format on the SD Card and display a graph in excel file. This includes applied usage such as reading of real-time-clock (RTC) or the value on analog.

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Execute the sample program below to have the green LED flicker every 1 second.

#include <arduino.h>
#include <RTC.h>
 
RTC rtc;
static int year, mon, day, hour, min, sec, week;
  
void setup() {
    pinMode(PIN_LED_GREEN, OUTPUT);
    digitalWrite(PIN_LED_GREEN, LOW); // LED OFF
    Serial.begin(9600);
      
    year = 2016;
    mon  = 7;
    day  = 23;
    hour = 13;
    min  = 20;
    sec  = 50;
    week = RTC_WEEK_SATURDAY;
      
    rtc.begin();
    rtc.setDateTime(year, mon, day, hour, min, sec, week);
  
}
  
void loop() {
    static int sec_old = sec;
    rtc.getDateTime(year, mon, day, hour, min, sec, week);
     
    if((sec - sec_old) % 60){
        digitalWrite(PIN_LED_GREEN, HIGH); // blink LED
        delay(5);
        digitalWrite(PIN_LED_GREEN, LOW);
        Serial.print(year); Serial.print("/");
        Serial.print(mon);  Serial.print("/");
        Serial.print(day);  Serial.print(" ");
        Serial.print(hour); Serial.print(":");
        Serial.print(min);  Serial.print(":");
        Serial.print(sec);
        Serial.println();
        sec_old = sec;
    }
}

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Next, here is a sample program to save the data on an SD card. Insert a  Micro SD into the socket on the back of GR-PEACH to execute a sketch. When writing to the SD card has successfully completed, the green LED will flicker. When you fail to access the  SD Card, the red LED flashes, please make sure the Micro SD is inserted correctly.

#include <arduino.h>
#include <RTC.h>
#include <SD.h>
 
RTC rtc;
static int year, mon, day, hour, min, sec, week;
void sd_timestamp(uint16_t* date, uint16_t* time);
 
 
void setup() {
    pinMode(PIN_LED_GREEN, OUTPUT);
    pinMode(PIN_LED_RED, OUTPUT);
    digitalWrite(PIN_LED_GREEN, LOW);
    digitalWrite(PIN_LED_RED, LOW);
     
    Serial.begin(9600);
    if (!SD.begin()) {
        digitalWrite(PIN_LED_RED, HIGH); // error
        while(1);
    }
     
    SdFile::dateTimeCallback( &sd_timestamp );
     
    year = 2016;
    mon  = 7;
    day  = 23;
    hour = 13;
    min  = 20;
    sec  = 50;
    week = RTC_WEEK_SATURDAY;
     
    rtc.begin();
    rtc.setDateTime(year, mon, day, hour, min, sec, week);
 
}
 
void loop() {
    static int deg = 0;
    File file = SD.open("data.csv", FILE_WRITE);
    if (file) {
        digitalWrite(PIN_LED_GREEN, HIGH);
        rtc.getDateTime(year, mon, day, hour, min, sec, week);
        // date
        file.print(year);   file.print("/");
        file.print(mon);    file.print("/");
        file.print(day);
        file.print(",");
        // time
        file.print(hour);   file.print(":");
        file.print(min);    file.print(":");
        file.print(sec);
        file.print(",");
        // data
        file.print(sin(deg * PI / 180.0));
        file.print(",");
        file.print(cos(deg * PI / 180.0));
        file.println();
        file.close();
        deg+=5;
        digitalWrite(PIN_LED_GREEN, LOW);
    }
     
    delay(500);
}
 
void sd_timestamp(uint16_t* date, uint16_t* time)
{
    *date = FAT_DATE(year, mon, day);
    *time = FAT_TIME(hour, min, sec);
}

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#include <arduino.h>
#include <RTC.h>
#include <SD.h>

RTC rtc;
static int year, mon, day, hour, min, sec, week;
void sd_timestamp(uint16_t* date, uint16_t* time);
  
  
void setup() {
    pinMode(PIN_LED_BLUE, OUTPUT);
    pinMode(PIN_LED_RED, OUTPUT);
    digitalWrite(PIN_LED_BLUE, LOW);
    digitalWrite(PIN_LED_RED, LOW);
      
    Serial.begin(9600);
    if (!SD.begin()) {
        digitalWrite(PIN_LED_RED, HIGH); // error
        while(1);
    }
      
    SdFile::dateTimeCallback( &sd_timestamp );
      
    year = 2016;
    mon  = 7;
    day  = 28;
    hour = 23;
    min  = 55;
    sec  = 50;
    week = RTC_WEEK_THURSDAY;
      
    rtc.begin();
    rtc.setDateTime(year, mon, day, hour, min, sec, week);
  
}
  
void loop() {
    File file = SD.open("data.csv", FILE_WRITE);
    if (file) {
        digitalWrite(PIN_LED_BLUE, HIGH);
        rtc.getDateTime(year, mon, day, hour, min, sec, week);
        // date
        file.print(year);   file.print("/");
        file.print(mon);    file.print("/");
        file.print(day);
        file.print(",");
        // time
        file.print(hour);   file.print(":");
        file.print(min);    file.print(":");
        file.print(sec);
        file.print(",");
        // data
        file.print(analogRead(A0));
        file.println();
        file.close();
        digitalWrite(PIN_LED_BLUE, LOW);
    }
      
    delay(500);
}
  
void sd_timestamp(uint16_t* date, uint16_t* time)
{
    *date = FAT_DATE(year, mon, day);
    *time = FAT_TIME(hour, min, sec);
}