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How do I turn on the LED light on my Arduino?
To turn on an LED, the Arduino needs to send a HIGH signal to one of it’s pins. To turn off the LED, it needs to send a LOW signal to the pin. You can make the LED flash by changing the length of the HIGH and LOW states.
You can easily interpret that this switch has two common pins which are simultaneously switched ON and OFF. When the trigger is pushed and moves down a notch, the connections between Pin 1 to Pin 2 and Pin 5 to Pin 6 are made. This is the ON state of the switch.
Why do you need a resistor for a button?
The value of the pull-up resistor needs to be chosen to satisfy two conditions: When the button is pressed, the input pin is pulled low. The value of resistor R1 controls how much current you want to flow from VCC, through the button, and then to ground. When the button is not pressed, the input pin is pulled high.
How does a push button light switch work?
A spring is placed inside it to take it back in initial or off position as soon as the button is released. It is usually made up of hard material like plastic or metal. A Push Button is a type of switch work on a simple mechanism called “Push-to-make”.
The push-button switch is connected to the Arduino‘s input pin 12 and to a 10K pull-up resistor. The LED ‘s anode is connected to digital pin 13 and its cathode, to ground through a 330Ω current limiting resistor, exactly as was done in the LED blinker circuit .
This new circuit is an evolution of the LED blinker circuit and program. Instead of using a delay to alternately turn the LED on and off, we are going to use a push-button to signal the system to toggle an LED on or off.
What happens when you press the push button?
The circuit re-opens as the pressure on the push button is released, preventing current from flowing. Let’s connect normally open push-buttons as in the following diagram.