SunFounder Thales Kit, Руководство пользователя, Страница: 159 / 167

SunFounder Thales Kit for Raspberry Pi Pico, Release 1.0
Wiring
In this experiment, we will use 5 LEDs to show the light intensity. The higher the light intensity is, the more LEDs
will light up, vice versa.
Code
How it works?
const int ledPins[] = { 11 , 12 , 13 , 14 , 15 };
const int photocellPin = A0; //photoresistor attach to A0
int sensorValue = 0 ; // value read from the sensor
int Level = 0 ; // sensor value converted into LED 'bars'
First of all, there are still various initialization definitions, setting pins and setting initial values of variables.
In order to quickly set the input/output status and HIGH/LOW for the 5 LEDs in the following code, here we use the
array
ledPin[]
to define the 5 LEDs connected to the corresponding pins of the Pico.
The element number of the array usually starts from 0. For example,
ledPin[0]
refers to GPIO11, and
ledPin[4]
refers to GPIO15.
• array
void setup ()
{
Serial . begin ( 9600 ); // start serial port at 9600 bps:
for ( int i = 0 ; i < 5 ; i ++ )
{
pinMode (ledPins[i], OUTPUT ); // make all the LED pins outputs
}
}
In
setup()
using the
for()
statement set the 5 pins to OUTPUT. The variable
i
is added from 0 to 5, and the
pinMode()
function sets pin11 to pin15 to OUTPUT in turn.
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