i m trying to save the reading of LM35 temp sensor with date and time when reading was taken. Everything is working perfect when i m seeing the readings in serial monitor. but m not able to save the data in sd card using arduino UNO. same code working perfectly when m not using RTC but m having problem when i m using RTC.here is my code. plz suggest where m going wrong.
tmp_rtc.ino (1.8 KB)
DS1302RTC RTC(8, 9, 10);
You may have a conflict between the pin10 rtc clock and the default chip select pin10 in sd.h.
Try move the rtc clock to another pin.
Kindly assign a pin number to your variable named "chipSelect".
m using sd+ethernet shield. so i think there's no need to assign pin no
i had tried to break into multiple prints. but its still not working.
i changed pin no of rtc and also assign pin no to chip select. it started to save the time and date.. bt it's saving incorrect data from rtc.Then, i burn the basic code of RTC only to check the settings and there, it's displaying the correct date time.
here is the attached pic of changed pin no and output in serial
There are several different libraries for the ds1302. Please provide a reference to the one you are using.
Please post your latest complete code with the code symbols found in the toolbar icon </>.
The code should appear in a window like this
Place your code here
I'm not you are reading the rtc in loop, and the synchronization between the time library and the rtc may not be correct. The rtc time/date may be correct, but it is not being passed into the program.
http://playground.arduino.cc/Main/DS1302RTC
here's the link of library of RTC.
yes i using it in loop but m also controlling it through switch.
here is the full code. now the data displaying in serial monitor is correct but in sd card ,only time and date is saving correct but year,month is saving incorrectly
tmp_rtc.ino (2.3 KB)
Please read the forum posting instructions at http://forum.arduino.cc/index.php/topic,148850.0.html
If you post your code as described, you will get more people to see it and you will get more help.
#include <DS1302RTC.h>
#include <Time.h>
#include <TimeLib.h>
#include <Wire.h>
#include <SPI.h>
#include <SD.h>
// Set pins: CE, IO,CLK
DS1302RTC RTC(8,7,6);
tmElements_t tm;
File dataFile;
const int chipSelect = 4;
const int temp_sw1= 5;
float sensorValue = 0;
float tempc=0;
float tempf=0;
const int analogInPin = A0;
void setup()
{
Serial.begin(9600);
pinMode(analogInPin, INPUT);
pinMode(temp_sw1, INPUT);
digitalWrite(temp_sw1, HIGH);
RTC.read(tm);
while (!Serial) {
;
}
Serial.print("initializing SD card...");
if (!SD.begin(4)) {
Serial.println("Card failed, or not present");
// don't do anything more:
return;
}
Serial.println("initialized done");
delay(1000);
dataFile = SD.open("temp.csv",FILE_WRITE);
if(dataFile){
dataFile.println("temp(C), temp(F), Time, Date");
dataFile.close();
}
}
void loop()
{
if(!(digitalRead(temp_sw1)))
{
Serial.print("Pls wait.......");
Serial.println();
delay(1000);
if(analogRead(analogInPin))
{
sensorValue = analogRead(analogInPin);
while(digitalRead(analogInPin));
delay(10000);
}
tempc = (sensorValue*5*100)/1023;
tempf = tempc * 1.8 + 32;
Serial.print(" tempc= ");
Serial.println(tempc );
Serial.print( "tempf=" );
Serial.println(tempf );
Serial.print(" Time = ");
unsigned long int hr =tm.Hour;
unsigned long int mint =tm.Minute;
unsigned long int sec =tm.Second;
String times = String(hr)+ ":"+ String(mint)+ ":"+ String(sec);
Serial.println(times);
Serial.print(" Date (D/M/Y) = ");
unsigned long int days =tm.Day;
unsigned long int mnth =tm.Month;
unsigned long int yr =tmYearToCalendar(tm.Year);
String dtes = String(days)+ ":"+ String(mnth)+ ":"+ String(yr);
Serial.println(dtes);
delay(1000);
dataFile = SD.open("temp.csv", FILE_WRITE);
if(dataFile){
Serial.println("Writing..");
dataFile.print(tempc);
dataFile.print(",");
dataFile.print(tempf);
dataFile.print(",");
delay(10000);
dataFile.print(times);
delay(10000);
dataFile.print(",");
dataFile.print(dtes);
delay(10000);
dataFile.close();
Serial.println("done");
}else
{
Serial.println("error opening test.txt");
}
}
}
yes i using it in loop but m also controlling it through switch.
. now the data displaying in serial monitor is correct
Not that I can see when I run your program. The only place I see RTC.read(tm); is in setup. The printed time/date does not change. The data in the time elements structure does not change by itself with the code you are using. The statement needs to be in loop as well.
sd card ,only time and date is saving correct but year,month is saving incorrectly
I don't see this.
Try a new line to make things more clear
dataFile.println(dtes);
thank you everyone its working now..