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Questions and Answers
We define a constant for the digital output pin as 'const int pin_o = ______;'
We define a constant for the digital output pin as 'const int pin_o = ______;'
13
The variable 'State' is used to store the state of the ______.
The variable 'State' is used to store the state of the ______.
input
To set pin 13 as an output, the function used is 'pinMode(pin_o, ______);'.
To set pin 13 as an output, the function used is 'pinMode(pin_o, ______);'.
OUTPUT
The function 'digitalRead(pin_i)' reads the pin state and assigns it to the ______.
The function 'digitalRead(pin_i)' reads the pin state and assigns it to the ______.
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When the button is pressed, 'digitalWrite(pin_o, ______);' turns the LED on.
When the button is pressed, 'digitalWrite(pin_o, ______);' turns the LED on.
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Study Notes
Digital I/O Code Example
- The code defines two integer constants:
pin_ofor the output pin (13) andpin_ifor the input pin (1). - The
Statevariable will store the state of the input (pushbutton). - The
setup()function is executed once and configures the pins:pinMode(pin_o,OUTPUT)sets pin 13 as an output.pinMode(pin_i,INPUT)sets pin 1 as an input.
- The
loop()function is executed repeatedly:State = digitalRead(pin_i)reads the value of pin 1 and assigns it to theStatevariable.- The
ifstatement checks if theStateis 1 (button pressed) and then:digitalWrite(pin_o,HIGH)sets the output pin (13) to a high level, turning the LED on.
- The
elsestatement executes if the button is not pressed:digitalWrite(pin_o,LOW)sets the output pin (13) to a low level, turning the LED off.
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