無論是玩樂高 NXT/EV3 抑或是 mBot，學習課程內容通常包含循跡車，其中最難的部分在走 8 字形，這宛如像汽車考照 S 行進倒退一樣，本週的程式練習題就是你會怎樣寫循跡車程式，也就是甚麼是你的控制規則？
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| 圖片引自 http://www.4399.com/flash/46864.htm |
Arduino
|
mBot
|
S4A (motoduino)
|
D0
|
BT RX
|
Digital IN
|
D1
|
BT TX
|
Digital IN
|
D2
|
IR RX
|
Digital IN
|
D3
|
IR TX
|
Digital IN
|
D4
|
M1 H: Forward L: Backward
|
SERVO
|
D5
|
M2(RIGHT) PWM
|
PWM (M1)
|
D6
|
M1(LEFT) PWM
|
PWM (M2)
|
D7
|
M2 H: Backward L: Forward
|
SERVO
|
D8
|
BUZZER
|
SERVO
|
D9
|
PORT2-1 LIGHT-SENSOR(LEFT) H: White
|
PWM
|
D10
|
PORT2-2 LIGHT-SENSOR(RIGHT) H: White
|
Digital OUT
(M1, H: F, L: B)
|
D11
|
PORT1-1
|
Digital OUT
(M2, H: F, L: B)
|
D12
|
PORT1-2
|
Digital OUT
|
D13 / SCK
|
Digital OUT
| |
A0
|
PORT4-1
|
Analog IN
|
A1
|
PORT4-2
|
Analog IN
|
A2
|
PORT3-1 ULTRASOUND ECHO
|
Analog IN
|
A3
|
PORT3-2 ULTRASOUND TRIG
|
Analog IN
|
A4
|
SDA
|
Analog IN
|
A5
|
SCL
|
Analog IN
|
A6
|
LIGHT SENSOR H: Light
| |
A7
|
BUTTON H: Press
|
char num = 2;
char a = 'D';
void setup()
{
if (num == 0) {
a = 'A';
num += 1;
} else if (num == 1) {
a = 'B';
num += 1;
} else if (num == 2) {
a = 'C';
num += 1;
}
}
void loop()
{
}
