Let's start with led blinking in arduino
You can download the source code from the following link:
https://drive.google.com/file/d/0B4Px6Drl6Zz_Z3ZfaGhIallGUnc/view?usp=sharing
The code is self explanatory. Pin number 13 of arduino is configured as output. cost int led=13
makes it a read only variable and also pin number 13 is named as led.
You can use any digital pins i.e from 0 to 13. We have taken pin number 13 because the in-built led of arduino is connected to pin number 13. If you are going to use any other pin please don't forget to connect the external resistor having a minimum value of 220 ohm resistance.
delay(1000) // It provides a delay of 1000 ms i.e. 1s
Now coming to the calculation of resistance, it is as per according to Ohm's law:
V==IR
The led have forward current of about 25 milli Amps and voltaage provided by arduino is +5 volts
I = V/R ....... I = 5000/25, which comes out to 200 ohms. But this is not a standard value and the nearby value is 220E. Feel free to comment here.
 |
| Led Blinking Code |
 |
| Schematics using Fritzing |
https://drive.google.com/file/d/0B4Px6Drl6Zz_Z3ZfaGhIallGUnc/view?usp=sharing
The code is self explanatory. Pin number 13 of arduino is configured as output. cost int led=13
makes it a read only variable and also pin number 13 is named as led.
You can use any digital pins i.e from 0 to 13. We have taken pin number 13 because the in-built led of arduino is connected to pin number 13. If you are going to use any other pin please don't forget to connect the external resistor having a minimum value of 220 ohm resistance.
delay(1000) // It provides a delay of 1000 ms i.e. 1s
Now coming to the calculation of resistance, it is as per according to Ohm's law:
V==IR
The led have forward current of about 25 milli Amps and voltaage provided by arduino is +5 volts
I = V/R ....... I = 5000/25, which comes out to 200 ohms. But this is not a standard value and the nearby value is 220E. Feel free to comment here.
