Keyestudio ARDUINO maker learning kit, Manual

Page: 54 / 162

keyestudio
www.keyestudio.cc
52
We use the analog interface 0.
The analog interface we use here is interface 0.
Sample program
The program compiling is simple. An analogRead () Statement can read the value of the interface.
The A/D acquisition of Arduino 328 is in 10 bits, so the value it reads is among 0 to 1023. One
difficulty in this project is to display the value on the screen, which is actually easy to learn. First,
we need to set the baud rate in voidsetup (). Displaying the value is a communication between
Arduino and PC, so the baud rate of the Arduino should match the the one in the PC's software set
up. Otherwise, the display will be messy codes or no display at all. In the lower right corner of the
Arduino software monitor window, there is a button for baud rate set up. The set up here needs to
match the one in the program. The statement in the program is Serial.begin(); enclosed is the baud
rate value, followed by statement for displaying. You can either use Serial.print() or Serial.println()
statement.
//////////////////////////////////////////////////////////
int potpin=0;// initialize analog pin 0
int ledpin=13;// initialize digital pin 13
int val=0;// define val, assign initial value 0
void setup()
{
pinMode(ledpin,OUTPUT);// set digital pin as “output”
Serial.begin(9600);// set baud rate at 9600
}