구차니의 잡동사니 모음

It takes about 100 microseconds (0.0001 s) to read an analog input, so the maximum reading rate is about 10,000 times a second. 

Can I build a commercial product based on Arduino?

Yes, with the following conditions:

• Physically embedding an Arduino board inside a commercial product does not require you to disclose or open-source any information about its design.
• Deriving the design of a commercial product from the Eagle files for an Arduino board requires you to release the modified files under the same Creative Commons Attribution Share-Alike license. You may manufacture and sell the resulting product.
• Using the Arduino core and libraries for the firmware of a commercial product does not require you to release the source code for the firmware. The LGPL does, however, require you to make available object files that allow for the relinking of the firmware against updated versions of the Arduino core and libraries. Any modifications to the core and libraries must be released under the LGPL.
• The source code for the Arduino environment is covered by the GPL, which requires any modifications to be open-sourced under the same license. It does not prevent the sale of derivative software or its inclusion in commercial products.

In all cases, the exact requirements are determined by the applicable license. Additionally, see the previous question for information about the use of the name “Arduino”.  

D-SUN "USB to TTL" (Blue)

(Rx & Tx use 3.3V logic levels) 

Gikfun YP-02 USB to TTL, CH340, 6-pin

(Rx & Tx use ~3.7V logic levels) 

#include <Servo.h>
Servo servo;
int servoPin = 9;

long swing_period = 3000;
long servo_period = 10;
long swing_count  = 0;
long dir = 0;
long angle = 0;
long min_angle = 45;
long max_angle = 135;
long move_angle = max_angle - min_angle;

void setup() {
  // put your setup code here, to run once:
  servo.attach(servoPin);
}

void loop() {
  // put your main code here, to run repeatedly:
  if (swing_count < swing_period) swing_count += servo_period;
  else
  {
    swing_count = 0;
    if (dir == 0) dir = 1;
    else dir = 0;
  }

  if (dir == 0) // inc
    angle = min_angle + move_angle * swing_count / swing_period;
  else // dec
    angle = max_angle - move_angle * swing_count / swing_period;

  servo.write(angle);
  delay(servo_period);
}

digitalWrite(RELAY1,LOW); // Turns ON Relays 1

Serial.println("Light ON");

delay(2000); // Wait 2 seconds

digitalWrite(RELAY1,HIGH); // Turns Relay Off

Serial.println("Light OFF");

delay(2000); 

A접점(arbeit contact)은 전기적으로 릴레이에 전류가 흐르면 동작하여 닫히는(ON) 접점

(normally open contact). 

B접점(break contact)은 전기전으로 릴레이에 전류가 흐르면 동작하여 접점이 열리는(OFF) 접점.

상시폐접점(normally closed contact).

C접점(change-over contact)은 a, b접점부를 공유, 트랜스퍼 접점(transfer contact) 이라고도 함.

A접점=NO(Normally open)

B접점=NC(Normally closed)

C접점=Transfer contact