【シリアル通信〜基礎編】USBを繋いでArduino Unoとラズパイ間で簡単なシリアル通信を行ってみる

            $ ls -l /dev/ | grep tty
#...中略
crw-rw---- 1 root dialout 166,   0  6月 10 18:17 ttyACM0
crw-rw---- 1 root dialout 204,  64  6月 10 18:17 ttyAMA0
crw-rw---- 1 root dialout   4,  64  6月 10 18:17 ttyS0
#...
        

            $ ls -l /dev/ | grep serial
drwxr-xr-x 4 root root          80  6月 10 18:17 serial
lrwxrwxrwx 1 root root           7  6月 10 18:17 serial0 -> ttyAMA0
lrwxrwxrwx 1 root root           5  6月 10 18:17 serial1 -> ttyS0
        

            #define LED_PIN 13
int flg=0;

void setup() {
    pinMode(LED_PIN, OUTPUT);
    Serial.begin(9600);
}

void loop() {
    if (Serial.available() > 0) {
        flg = Serial.read();
        Serial.println(flg);
        if (flg == 49) {
            digitalWrite(LED_PIN, HIGH);
        } else if (flg == 48) {
            digitalWrite(LED_PIN, LOW);
        }
    }
}
        

            $ echo -n '1' > /dev/ttyACM0
        

            $ stty -F /dev/ttyACM0
#👇出力
speed 9600 baud; line = 0;
-brkint -imaxbel
        

            $ stty -F /dev/ttyACM0 -hupcl
        

            #👇点灯
$ echo 1 > /dev/ttyACM0
#👇消灯
$ echo 0 > /dev/ttyACM0
        

            #define LED_PIN 13

void setup(){
    Serial.begin(9600);
    pinMode(LED_PIN, OUTPUT);
}

void loop(){
    Serial.println("LED ON");
    digitalWrite(LED_PIN, HIGH);
    delay(1000);

    Serial.println("LED OFF");
    digitalWrite(LED_PIN, LOW);
    delay(1000);
}
        

            $ sudo screen /dev/ttyACM0 9600
LED ON
LED OFF
LED ON
LED OFF
LED ON
LED OFF
LED ON
LED OFF
LED ON
LED OFF
LED ON
#...略