Hello everyone,
I'm agriculture researcher and new with Arduino. I'm trying to make a datalogging unit to measure some important parameters for estimating water stress over plants. In this unit, I'm using the following component:
- Arduino Uno board
- IR temperature [MLX90614]sensor to measure plant canopy temperature
- SEN0308 soil moisture sensors
- DHT22 sensor for measuring air Temp and humidity.
- micro SD card module
- RTC DS3231 module
I'm trying to save the data on csv file each 30 min.
The wiring diagram is attached
and my code is the following:
/*this code is the second version of the a test for data logging using RTC DS3231 module
save air temperature with time stamp half-hourly
Board: Arduino uno
Sensors:
DHT22 temperature & Humidity sensor
The DHT connection:
DHT : PIN 2
/* MLX90614 canopy temperature (IR sensor)
--------------------------------
Arduino Uno connection:
MLX [UNI]:5V
MLX [GND]:GND
MLX [SCL]:A5
MLX [SDA]:A4
I2C address: 0x5A0
----------------------
/*SEN0308 soil moisture sensors
---------------------------------
(sensor 1: depths (0-20 cm))
SEN0308 [Red]: 5 V
SEN0308 [Black]: GND
SEN0308 [Yellow]:A0
SEN0308 [Black]: GND
-------------------------------
The sd pin out connection:
SD SCK : PIN 13
SD MISO : PIN 12
SD MOSI : PIN 11
SD CS : PIN 10
RTC ---------------
RTc GND:GND
RTC VCC:5V
RTC SDA:A4
RTC SCL:A5
I2C address: 0x68
*/
//libraries:
#include <SPI.h>
#include <SD.h>
#include <DHT.h>
#include <RTClib.h>
#include <TimeLib.h>
#include <Adafruit_MLX90614.h> //IR temp MLX sesnor liberiry
#include <Wire.h>
///////////////////////////SD CARD/////////////////////////
const int chipSelect = 10;
///////////////////////DHT/////////////////////////////////
#define DHTPIN 2 // the digital pin of sensor
#define DHTTYPE DHT22 // define the type of sensor
DHT dht(DHTPIN,DHTTYPE); // initialize DHT sensor
// Create a file to store the data
File myFile;
//RTC
RTC_DS3231 rtc;
//MLX90614 canopy temperature (IR sensor)
Adafruit_MLX90614 mlx=Adafruit_MLX90614();
void setup() {
// put your setup code here, to run once:
Serial.begin(9600); // SERIAL INITIALIZE
dht.begin(); // DHT INITIALIZE
mlx.begin(); //mlx intialization
if (! mlx.begin()) {
Serial.println("Couldn't find Temperature Sensor");
while (1);
} else {
Serial.println("IR Sensor WORKS!");
}
while (!Serial);
if (! rtc.begin()){
Serial.println("Couldn't find RTC");
while (1);
}
else {
rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
Serial.println("RTC WORKS!");
}
// Setup for SD card
Serial.print("Initializing SD card...");
// see if the card is present and can be initialized:
if (!SD.begin(chipSelect)) {
Serial.println("Card failed, or not present");
// don't do anything more:
while (1);
}
Serial.println("card initialized.");
//setup of eile
//open file
myFile =SD.open ("RTC_h.csv", FILE_WRITE);
// if the file opened ok, writ to it:
if (myFile){
Serial.println("File opened ok");
//print the headings for the data
myFile.println("Date, Time, Temp C, Rh %,t_amb C, t_can C, Soil_m");
}
myFile.close();
}
void loop() {
DateTime now = rtc.now();
//to save the data to the csv file each 30 minuts
if ((now.minute() == 00 && now.second()==0)|| (now.minute() == 30 && now.second()==0)){
myFile = SD.open("RTC_h.csv", FILE_WRITE);
if (myFile) {
myFile.print(now.year(), DEC);
myFile.print('/');
myFile.print(now.month(), DEC);
myFile.print('/');
myFile.print(now.day(), DEC);
myFile.print(',');
myFile.print(now.hour(), DEC);
myFile.print(':');
myFile.print(now.minute(), DEC);
myFile.print(':');
myFile.print(now.second(), DEC);
myFile.print(",");
myFile.close();
}
Serial.print(now.year(), DEC);
Serial.print('/');
Serial.print(now.month(), DEC);
Serial.print('/');
Serial.println(now.day(), DEC);
Serial.print(now.hour(), DEC);
Serial.print(':');
Serial.print(now.minute(), DEC);
Serial.print(':');
Serial.println(now.second(), DEC);
delay(1000);
// Reading temperature or humidity takes about 250 milliseconds!
// Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
// Read temperature as Celsius
float t = dht.readTemperature();
float RH=dht.readHumidity();
//IR sensor to read plant canopy temperature (t_can), and ambient temperature (t_amp)
float t_amb=mlx.readAmbientTempC();
float t_can=mlx.readObjectTempC();
/////////////SEN0308 soil moisture sensor
int SEN20; //(sensor 1: depths (0-20 cm))
SEN20= analogRead (A0);
// Check if any reads failed and exit early (to try again).
if (isnan(t) /*|| isnan(f)*/) {
Serial.println("Failed to read from DHT sensor!");
return;
}
//debugging purposes
Serial.print("Temperature: ");
Serial.print(t);
Serial.print(" *C");
Serial.print("-");
Serial.print("Relative Humudity:");
Serial.print(RH);
Serial.print("%");
Serial.print("-");
Serial.print("t_ambient:");
Serial.print(t_amb);
Serial.print("C");
Serial.print("-");
Serial.print("t_canopy:");
Serial.print(t_can);
Serial.print("C");
Serial.print("-");
Serial.print("Soil_m:");
Serial.print(SEN20);
Serial.println("v");
myFile = SD.open("RTC_h.csv", FILE_WRITE);
if (myFile) {
Serial.println("open with success");
myFile.print(t);
myFile.print(",");
myFile.print(RH);
myFile.print(",");
myFile.print(t_amb);
myFile.print(",");
myFile.print(t_can);
myFile.print(",");
myFile.print(SEN20);
myFile.println(",");
}
myFile.close();
delay(5000);
}
}
Every time I run this code I get a problem with the time stamp saved in the csv file, that the time stamp continue repeating the same times of the first readings, and not getting the actual time!!
for example this is the result of the a test of operating the unite started at 10/3/2022 - 10:20 pm, and stopped at 11/3/2022 - 11:40 am
Any advice to solve this problem ?
Thank you in advance
