5-12V DC pump doesn't start through relay

Projects General Guidance
41

Hi,
Try this code, the relay and the LED on the UNO should operate 1second OFF, 1second ON.

int RelayPin = 10;
int LEDPin = 13;
int delayinterval = 1000; //delay 1second
void setup()
{
  pinMode(RelayPin, OUTPUT);
  pinMode(LEDPin, OUTPUT);
}

void loop()
{
  digitalWrite(RelayPin, LOW);
  digitalWrite(LEDPin, LOW);
  delay(delayinterval);
  digitalWrite(RelayPin, HIGH);
  digitalWrite(LEDPin, HIGH);
  delay(delayinterval);
}

Can you please post your code?

Tom.... :grinning: :+1: :australia:

42

Check relay contacts.

  1. Instead motor put small load = LED with resistor, then bigger load = light bulb from car.
  2. LED and motor
43

You'r code worked fine. Here is mine

int P = 10;
int r_pump = 10;

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

}
void loop() {
     int gh = analogRead(A1);
  gh = map(gh, 850, 230 , 0, 100);
  if (gh > P) {
    digitalWrite(r_pump, 255);
  }
  else {
    digitalWrite(r_pump, 0);
  }
  Serial.print( gh);
  delay(200);
}
44

Hi,
Thanks, so the relay operates and the pump runs?

int P = 10;
int r_pump = 10;

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

}
void loop() {
     int gh = analogRead(A1);
  gh = map(gh, 850, 230 , 0, 100);
  if (gh > P) {
    digitalWrite(r_pump, HIGH);
  }
  else {
    digitalWrite(r_pump, LOW);
  }
  Serial.print( gh);
  delay(200);
}

Try that, digital output is 1 or 0, HIGH or LOW.

Tom.... :grinning: :+1: :coffee: :australia:

45

Yeah, tried Low, High,1,0, nothing changed

46

You mean LED is not going ON/OFF ?

47

wrong reply

48

Is there any change that pump is being overloaded, and that's why it doesn't run?

49

I suspect that you have a bad connection somewhere. Running power through a breadboard isn't doing you any favours either.

50

HI,
Just t o clarify, my code worked?

What have you got connected to the analog input?
What does the serial monitor show?

Tom... :grinning: :+1: :coffee: :australia:

51

Check your relay without arduino, post 36. Vcc = 5V, ground, SIG wire jumper,
connect it;
A. to ground
B to Vcc
you should hear click.

Put ohmmeter to COM and NC

52

Hi,
Try this code and see if the relay operates and view the serial monitor;

int P = 10;
int r_pump = 10;

void setup() {
  Serial.begin(9600);
  Serial.println("=====PUMP RELAY TEST CODE=====");
  Serial.println("        2/05/2021");
  delay(1000);
  pinMode(r_pump, OUTPUT);

}
void loop() {
  //    int gh = analogRead(A1);
  //  gh = map(gh, 850, 230 , 0, 100);
  for (int gh = 0; gh < 20; gh++)
  {
    if (gh > P) {
      digitalWrite(r_pump, HIGH);
      Serial.print("OUTPUT HIGH...  Value of gh = ");
      Serial.println( gh);
    }
    else {
      digitalWrite(r_pump, LOW);
      Serial.print("OUTPUT LOW...  Value of gh = ");
      Serial.println( gh);
    }
    delay(200);
  }
}

Tom... :grinning: :+1: :coffee: :australia:

53

Bad brushes can cause that motor sometime is stock, use just motor instead of pump

54

its humidity sensor

55

I have used regular dc motor, worked fine

56

You have some debris inside pump, open it and clean up it.

57

Hi,

What spec/data?
Does my edited code work?

Tom... :grinning: :+1: :coffee: :australia:

58

sometime the small wire connector is weaked. change all your wire.

59

5 pumps $5
Sealed and waterproof.

Youu cannot repace wire or open the unit.

Lets hope the problem is not at the pump.

60

Pump needs lubrication, without water it can seize like a car engine without oil.
Put some oil into pomp, connect to battery, switch power on/of 10- 20 - forward/reverse -times and see if this helps