Arduino UNO sketch doesn't run after upload!

Projects Programming
1

Hi !

I need some help from experts, and I really hope someone can find a solution to my problem. I appreciate any and all help.

I'm a Portuguese Electronics Student and i just started using micro-controllers, so I decided to try out Arduino, and bought an Arduino Uno.
For a first project to start using Arduino e sketched a Temperature Sensor using an LM35 and an 16x2 LCD. I sketch my program and waited a while for it to upload, and it said "Upload successful", but the problem is that nothing ran on the Arduino. I looked in the troubleshooting guide, and i didn't find solution unfortunately .

I already checked all my jumpers and they are all OK, i also uploaded the Blinking Led project and it did run, so the ATMEGA is fine. I really don't know what else to do, because i think my sketch is fine.

here's the sketch so you can see if its ok:

#include <LiquidCrystal.h>

int sensor = 0;
int Ventrada;
float Temperatura;

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

void setup()
{
lcd.begin(16, 2);
lcd.print("A Iniciar...");
delay(3000);
lcd.print("Temperatura: ");
}

void loop()
{
Ventrada = analogRead (sensor);
Temperatura=(500*Ventrada)/1023;
lcd.setCursor(0, 1);
lcd.print(Temperatura);
lcd.print(" C"); // Celsius

delay(1000);
}

Can anyone help me?
By the way, the led L is constantly on, in the colour red.

Another doubt i have is, i connect my arduino board to my PC with the usb cable, so is the right programer AVRISP mkll ?

Thanks, Much Appreciated to everyone.

2

Put a Serial.begin(9600); line in the setup, then a couple of Serial.println("where the program is at"); in a couple of places and review the serial output with the serial monitor.

I suspect that you may have an issue with something else.

3

Have you successfully got programs to upload and run which just display output on the Arduino Serial monitor?

Have you ever got any display from your LCD device?
I have a couple of 16x2 LCD screens which are PC1602-H versions that need a -1.0v supply to make the display visible. I did not realize that when I bought them or I would have chosen different versions - i.e. not the -H version.

...R

4

Sketch works fine with a Arduino Uno and a LM35,and a 1602 display

5

Thanks for all your interest in helping me, I'm really appreciated ! As a newbie in Arduino and micro-controllers all your help worth a lot to me !!

@ChilliTronix
i'll do that, but can you clarify a question for me?
What's the difference in use Serial.printIn and Serial.print?

@Robin2
I didn't even try Arduino serial monitor :s my fault i know, but tomorrow i'll try it and let you know.
About the LCD the one i'm using is PC1602-N (at least it's what it sais in is back) and it was offered me by a friend so i really don't know for sure if it's working fine. It turns on when the pin 15 and 16 are connected to +V and GND, but i never saw it displaying text.

@gonnie08
Really ? I'm really happy to know it !!
Did you try it in a Arduino UNO ?
So can you tell me what am i doing wrong ?

6

Find a datasheet for the PC1602-N just to check everything, including the connections.

As far as I know it is only the -H variants that need the negative voltage - but I am not certain.

...R

7

Hi
you have the libraries on the good place??
and Yes I have it running on the UNO ,works perfectly
your code is fine

8

marco_mathiaz:
Hi !

I need some help from experts, and I really hope someone can find a solution to my problem. I appreciate any and all help.

::::SNIP::::

marco_mathiaz,
next time you post code please use "markup". Pleaes see the image attached.

Jesse

arduino_markup.png

9

Through in some Serial.prints to see if the code is working and the LCD is futzed, or if it's the actual code.

Not sure what model LCD I have, but I had to hook up V0 to a pot to adjust the contrast, then when i figured out the signal to send, I just had a pin do it.

Look at http://arduino.cc/en/Tutorial/LiquidCrystal for a better idea of what I'm talking about.

10

Marmotjr:
then when i figured out the signal to send, I just had a pin do it.

Does that mean your problem is now solved?

...R

11

Thanks again for all your help !
I've been studying because i've been having exams, so i honestly didn't have any opportunity to try your resolutions but i'm planning to pick this project up tomorrow and finally solve this (at least i hope).

@Marmotjr
I will through some serial.prints to see if it's the code or the LCD.
About the pot, i have a 10Kohm pot connected to V0 pin to adjust contrast but the problem is that i really don't get any info at all...
I didn't try Arduino serial monitor as i said, but tomorrow i'll try it and i'll give you and @robin2 some feedback.

@gonnie08
Yes, i do have the libraries in the right location/place.
I'm starting to think that it's the LCD that it's not right.

@jessemonroy650
I'm new at this forum, i didn't know that, but thanks,next time i will markup my code.