How does it work? Whenever a press the button the led is switched on. After 2 seconds the led is switched off. Things you need: a Breadboard a led a button 2 resistors (220Ohms) jumper wires. Connect it up Now, first make sure that your Arduino is powered off (unplug the USB cable or the external battery). Then connect everything up like this: The led Make sure that your LED is connected the right way with the longer leg connected to Digital pin 8. The long leg is the Anode of the LED and always must go to the +5V supply (in this cased coming out of Digital pin 8). And the short leg is the Cathode and is connected to a resistor (to limit the current that goes through the led and then to Gnd (Ground). The button Normally the button is not pressed and therefore the circuit is open and 0V(LOW) will be supplied to pin3. When the button is pressed, the circuit is closed and 5V(HIGH) will be supplied to pin3. Arduino board will read the PIN3 and
TECHNOLOGY, PROGRAMMING AND ROBOTICS