how to run a code once in the void loop setup? my aim to get a number from my sim card (eg 1234) and open the file in sd card of that name (1234.txt) #include #include LiquidCrystal lcd(2,3,4,5,6,7); #include #include File myFile; SoftwareSerial mySerial(9, 10); String c,r,t,e,x,m="1234"; String array[50]; int index=0; void setup() { lcd.begin(16,4); // put your setup code here, to run once: mySerial.begin(9600); // Setting the baud rate of GSM Module Serial.begin(9600); mySerial.println("AT+CPBR=1"); while (!Serial) { ; // wait for serial port to connect. Needed for native USB port only } Serial.print("Initializing SD card..."); if (!SD.begin(8)) { Serial.println("initialization failed!"); return; } Serial.println("initialization done."); } void loop() { if (mySerial.available()) { c = mySerial.read(); array[index]=c; index++; array[index]="0"; e=array[24]; r=array[25]; x=array[26]; t=e+r+x; myFile = SD.open(m+".txt"); if (myFile) { if(myFile.available()) { } // read from the file until there's nothing else in it: while (myFile.available()) { Serial.write(myFile.read()); } // close the file: myFile.close(); } }} iam getting correct output but it runs like 20 times eg: hii hii hii . . . .. . hii like this . i want to run it once and show it in the lcd display ple help me

Declare and set a global variable (say boolean hasRun = false). Put the code that you want to run once in a function. In loop() read the state of hasRun and if false execute the function (if(hasRun == false) runFunction()). Inside the function, set hasRun to true. The next time through loop() hasRun is true and the function will not ever execute again.

If you only want it to run once, put the code in setup

AWOL: If you only want it to run once, put the code in setup i put the code in loop but it doesnot work

So put the code in setup, not loop

You can make your code easier for us to read by using Ctrl-T in the IDE before posting. Also, things that are used to initialize objects (Initialization Step) are often best placed in the setup() function, as AWOL said. See this for details.

sorry prevous comment was a mistake i have put the code in setup but it doesn't work sir iam new in programming .can you correct my proggram plz?

i have put the code in setup but it doesn't work So, you did something wrong. (BTW, saying "it doesn't work" isn't helpful)

void setup() { // set up the LCD's number of columns and rows: Serial.begin.begin(16, 2); // Print a message to the LCD. } void loop() { Serial.print("hello, world!"); } here this hellow world print several time . how to print it one time in the void loop (without in setup() )

sir i don't know how to set glbal variable plz could you just corret my prograam i want i to put in loop()

how to run a code once in the void loop?

Projects Programming

system December 30, 2016, 5:53pm 10

See reply #1.
Or put the print in setup, where it will be executed just once per reset.

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how to run a code once in the void loop?

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