Hi everyone,
I’m trying to read several temperature sensors, write their value into a file on a microSD and also RTC.
My code currently takes up 52% which I feel is a lot. I’d appreciate input on what I can make easier or more streamlined. Please keep in mind that I’m a beginner and still learning. Code verifies but I couldn’t test it yet due to lack of a batterie for the RTC.
I’m doing all this with an Arduino Uno.
Thank you!
/*
Setup of Arduino Uno and SD card
* analog sensors on analog A0 to A5
* SD card attached as follows:
** MOSI - pin 11
** MISO - pin 12
** CLK - pin 13
** CS - pin 4
** power to 5, need to check output as USB doesn't provide enough power to run it. Gives error of partition not found if not enough juice
RTC
**VCC to 5V
**GND to GND
**SDA to SDA
**SCL to SCL
**SQW unused
// Thermistor connection
// Vin (5V) --\/\thermistor\/\---- Vout to analog input pin
// |
// ---(\/\/\R2\/\/\)--- GND
// For best results select R1 equal to the thermistor resistance
// at the temperature being read (maximizes resolution of ADC)
// (25k Ohm coresponds to ~6C)
// Thermistor: Thermistors, US Sensor PS103J2, 10K ohm 615-1003-ND Digikey
// Resistor: RESISTOR, 0.01% 25K; Resistance:25kohm; Resistance Tolerance:± 0.01% USR2-0808-25KT-ND Digikey
print_time() returns a string in the format mm-dd-yyyy hh:mm:ss
*/
#include <RTClib.h>
#include <SPI.h>
#include <SD.h>
RTC_DS1307 rtc;
const int chipSelect = 4; // where SD CS is connected
File dataFile;
String print_time(DateTime timestamp) {
char message[120];
int Year = timestamp.year();
int Month = timestamp.month();
int Day = timestamp.day();
int Hour = timestamp.hour();
int Minute = timestamp.minute();
int Second= timestamp.second();
sprintf(message, "%d-%d-%d %02d:%02d:%02d", Month,Day,Year,Hour,Minute,Second);
return message;
}
void setup(){
Serial.begin(9600); // opens connection to arduino
pinMode(4, OUTPUT); // select pin for output, where CS is on SD card
if (!SD.begin(4)){
Serial.println("Error: SD card would not initiate.");
} else {Serial.println("initialization done.");
}
rtc.begin();
if (!rtc.isrunning()){
Serial.println("Clock is not running");
}
dataFile = SD.open("TMSt1.csv", FILE_WRITE); // makes file and read and writes
if (dataFile) {
Serial.println("writing to TMSt1.csv ");
dataFile.println("Date, Time, TM1, TM2, TM3, TM4, TM5"); // writes header into file once, if reset pressed it will do it again at the end of the file before new reading begin
dataFile.close(); // ensures that header is saved, always need to close file to save
} else {
Serial.println("TMSt1.csv didn't open ");
}
}
void loop(){ // as a loop it keeps writing the values into file on sd card
// there has to be a more elegant way of doing this // 3.3 or 5 depending on where on arduino it is connected, //might need to change this to 12 bit
int sensorValue_A1 = analogRead(A1); //pin at which thermistor is connected (A1-A5)
// convert analog to voltage
float voltage_A1 = sensorValue_A1 * (5 / 1023.0);
int sensorValue_A2 = analogRead(A2); //pin at which thermistor is connected (A1-A5)
// convert analog to voltage
float voltage_A2 = sensorValue_A2 * (5 / 1023.0);
int sensorValue_A3 = analogRead(A3); //pin at which thermistor is connected (A1-A5)
// convert analog to voltage
float voltage_A3 = sensorValue_A3 * (5 / 1023.0);
int sensorValue_A4 = analogRead(A4); //pin at which thermistor is connected (A1-A5)
// convert analog to voltage
float voltage_A4 = sensorValue_A4 * (5 / 1023.0);
int sensorValue_A5 = analogRead(A5); //pin at which thermistor is connected (A1-A5)
// convert analog to voltage
float voltage_A5 = sensorValue_A5 * (5 / 1023.0);
Serial.println(voltage_A1); // to check it's reading something and if it makes sense, need to check how to write all readings in one line
File dataFile = SD.open("TMSt1.csv", FILE_WRITE);
if (dataFile){
DateTime now = rtc.now(); //gets current date and time from rtc
dataFile.println(print_time(now)); //write date and time reading in file
dataFile.println(",");
dataFile.print(voltage_A1);
dataFile.println();
dataFile.print(",");
dataFile.print(voltage_A2); //writes voltage in file
dataFile.print(","); //seperates voltage from date and time
dataFile.print(voltage_A3);
dataFile.print(",");
dataFile.print(voltage_A4);
dataFile.print(",");
dataFile.println(voltage_A5);
dataFile.close(); //works perfectly now, write everything until println in same line
}
else{ Serial.println("couldn't open file");
}
delay(5000); //prints time and voltage every 5 seconds
}