What command do i use

Using Arduino Programming Questions
1

I have not written the code yet. Here is what I want to happen. I am controlling DC MOTOR using 2 dp relays, one is dc= the other is dc -. When switch a is thrown, a led will come on and relay 1 will be energized. I want the relay ot be energized for milliseconds and then turn off while the led will stay on. What command would i use to energize the relay and the shut it off?

2

Time to start writing your code yourself. Look at blink example for inspiration...
Also a relay is not the best option for milliseconds of contact...

3

digitalWrite()

See Using millis() for timing. A beginners guide, Several things at the same time and the BlinkWithoutDelay example in the IDE

4

Divide the project in small steps:

.1. Wire a pushbutton to an LED: Vcc >> button in - button out >> 220 ohm resistor >> LED(+) - LED(-) >> GND

Pushbutton should make LED light. After that works...

.2. Wire the control end of a relay to a pushbutton: Vcc >> button in - button out >> RelayVcc (and) RelayGnd >> GND (and) Vcc/5Vdc >> button in - button out >> RelayIN

Pushbutton should energize relay. After that works...

.3. Wire the switched end of the relay to light an LED (use 5vdc for now): Vin >> RelayNC (and) GND >> RelayCOM (and) RelayNO >> 220 ohm resistor >> LED(+) - LED(-) >> GND

Pushbutton should energize relay and light LED.

.4. Code the relay to turn on and off

/*
   relay on/off

   WIRING
   Arduino 5vdc to relay +
   Arduino GND to relay -
   Arduino D03 to relay S (signal)

*/

// assign a digital pin to switch the relay
const int RELAY_PIN = 3;

void setup() {
  // initialize digital pin as an output.
  pinMode(RELAY_PIN, OUTPUT);
  digitalWrite(RELAY_PIN, LOW); // for N.O. relay open (not conducting)
}

void loop() {
    digitalWrite(RELAY_PIN, HIGH);  // close the relay
    delay(1000);
    digitalWrite(RELAY_PIN, LOW);   // open the relay
    delay(1000);
}

The relay should be clicking once a second. After that works...

.5. Code the Arduino to read a HIGH or LOW level from the pushbutton, then light the LED and toggle the relay. My relay does not respond to "1ms" toggle.

5

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