I'm a begginer with eletronic and Arduino.
I followed a video tutorial on youtube teaching how to make a blink led project.
I have done exactly the same way, including programming but my project does not work.
I'll attach photos of the project.
What am i doing wrong?
First you should be aware that the board has a led and resistor built in attached to pin 13.
Second, just a point to point description of your wires and parts would be more clear than those photos.
Third, in your IDE pulldown menus under File is Examples which gives you another menu of categories of Example Sketches. Each of those has Sketches for download that match your IDE version that have more full line by line explanations through this link:
Blink is the second sketch of section 01.Basics.
Fourth, the examples work but are not all completely right how-to lessons. They can be improved. They do what they should which is to get you started and show ways to do things.
Do work through what you have parts for in sections 1, 2, 3, and 5. If you do section 4 and 'get hooked on Strings' then the Arduino day will come when you will need to learn C strings so please for your own time wasted don't bother with section 4 until you can substitute C strings for C++ Strings.
Also section 5 probably shouldn't be so far down the list. The lessons in section 5 are Very Important Tools for you!
Size photos to 1025 by 768 or less before posting. Must be perfectly focused, otherwise forget it.
Post the sketch you are attempting to use - by cutting and pasting from the IDE as you are using it, not from anywhere else.
GoForSmoke:
First you should be aware that the board has a led and resistor built in attached to pin 13.Second, just a point to point description of your wires and parts would be more clear than those photos.
Third, in your IDE pulldown menus under File is Examples which gives you another menu of categories of Example Sketches. Each of those has Sketches for download that match your IDE version that have more full line by line explanations through this link:
http://arduino.cc/en/Tutorial/HomePageBlink is the second sketch of section 01.Basics.
Fourth, the examples work but are not all completely right how-to lessons. They can be improved. They do what they should which is to get you started and show ways to do things.
Do work through what you have parts for in sections 1, 2, 3, and 5. If you do section 4 and 'get hooked on Strings' then the Arduino day will come when you will need to learn C strings so please for your own time wasted don't bother with section 4 until you can substitute C strings for C++ Strings.
Also section 5 probably shouldn't be so far down the list. The lessons in section 5 are Very Important Tools for you!
Thank you GoForSmoke for the answer and the advice about pin 13.
When i get home tonight i will write a more detailed report about what i am doing and i will do what you recommended about the sections.
Paul__B:
Size photos to 1025 by 768 or less before posting. Must be perfectly focused, otherwise forget it.Post the sketch you are attempting to use - by cutting and pasting from the IDE as you are using it, not from anywhere else.
Thank you for the answer Paul.
When i get home i will post the details.
Hi Paul__Bon.
I tried to use the pins 10 and 13.
The pin is plugged with a 100 ohm resistor before the LED and the negative of the LED is plugged on GND.
I tried to use the VCC and GND pins of the arduino just to test my LED, plugging the led with resistor direct to VCC pin of arduino and the GND pin.
I tought the LED was bad and tried other 3 led but nothing changes.
Here is the code i'm using with arduino:
int led = 10;
void setup(){
pinMode(led,OUTPUT);
}
void loop(){
digitalWrite(led,HIGH);
delay(1000);
digitalWrite(led,LOW);
delay(1000);
}
Make sure you're not mixing up the anode and the cathode.
The longest leg of the LED (anode) is positive, and the other leg (cathode) should be connected to ground.
Thank you for the answer artaex.
I did right, i used longest as positive and the other as GND.
I tried to use the VCC and GND pins of the arduino just to test my LED, plugging the led with resistor direct to VCC pin of arduino and the GND pin.
I tought the LED was bad and tried other 3 led but nothing changes.
If you can't get any LEDs to work when using VCC and GND, then probably there's a bad connection or jumper wire. As a more direct test, you could eliminate the breadboard and jumper wires. Plug the LED's cathode into GND and one end of the resistor into VCC. Then touch the unconnected ends together and the LED should light up.
EDIT: I've seen some types of LEDs where the wire length is long for GND and short for anode (bad batch?).
Anyways, it is more important where the small flat section is at the bottom of the LED. This is the cathode.
Thank you for the answer dlloyd.
I tried to connect the LED directly to arduino the way you said but nothing happend.
i used 10 LEDs and other 10 resistors to test but no one seems to be working.
Can i test the LED with a normal heap?
If not, how can i do that?
Try reversing one of the LEDs. If nothing, then are you sure they're not IR LEDs?
If so, the illumination of IR LEDs can be seen through most cell phone cameras that don't use an IR filter.
EDIT: Do you have a part number for the LEDs?
From the picture it looks like you're using 100R for the resistor ... depending on the led type, this could mean 30+ mA draw, which exceeds the ratings of many LEDs ... try resistors in the range of 220R to 1K.
Dlloyd, you're completely right and i am a completely idiot.
The LED is IR and i did not realyzed that.
Very thanks for the help to you and the others.
You should be able to see an IR led with a webcam or most digital cameras even though they have IR filters.
CCD units are insanely sensitive to IR. 8) -- why they need filters, so reflected sunlight don't overwhelm them
The led should look white when it's on.
EDIT: I've seen some types of LEDs where the wire length is long for GND and short for anode (bad batch?).
OMG...
I thought the Chinese merchant was just messin' with me!
mrburnette:
EDIT: I've seen some types of LEDs where the wire length is long for GND and short for anode (bad batch?).
OMG...
I thought the Chinese merchant was just messin' with me!
Perhaps they don't know the name Murphy?