Keyestudio ARDUINO maker learning kit, Manual

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33
{
digitalWrite(i, HIGH); // set I/O pins as “high”, turn on LEDs one by one
delay(200); // delay
}
}
//////////////////////////////////////////////////////////
Result
You can see the LEDs blink by sequence.
*******************************************************************************
Project 6: Button-controlled LED
Introduction
I/O port means interface for INPUT and OUTPUT. Up until now, we have only used its OUTPUT
function. In this experiment, we will try to use the input function, which is to read the output value
of device connecting to it. We use 1 button and 1 LED using both input and output to give you a
better understanding of the I/O function. Button switches, familiar to most of us, are a switch
value (digital value) component. When it's pressed, the circuit is in closed (conducting) state.
Hardware required
Button switch*1
Red M5 LED*1
220Ω resistor*1
10KΩ resistor*1
Breadboard*1