I am trying to turn on a light when my sensor outputs it detects water

Projects Programming
1

i am trying to turn on a light when my output detects water but i am not sure what the sensor actually outputs and anything i have tested fails to turn the light on this is the product wiki Non-contact Capacitive Liquid Level Sensor Arduino Wiki - DFRobot any insight would be very appreciated

2

these are the code i have already tried

 digitalWrite(lightPin, digitalRead(inPin));

the idea was the light would turn on when the sensor what high and off when sesnor was low

int inPin = 8;
boolean running = 0;//when running=1, the liquid is detected, print out 1, otherwise, print out 0; running=0, the liquid is detected, print out 0, otherwise, print out 1.
int modePin = 9;
int lightPin = 5;

void setup()
{
  Serial.begin(9600);
  pinMode(inPin, INPUT);
  pinMode(modePin, OUTPUT);
  digitalWrite(modePin, running);
}

void loop()
{
  Serial.println(digitalRead(inPin));
  if (inPin == 1) {
    digitalWrite(5, HIGH);
  }
  else {
    digitalWrite(5, LOW);
  }
}

and this idea was when the boolean running was 1 light turn on as that was what the product wiki said its function was but it didn't work

3

Did you try that sample code in your link?

4

thats who i got the idea for the second code but it didn't work i could have been me could you try writing some code for it

5

If this is the device you are using then when mode=0 the signal will be low when water is detected. Mode=1 will reverse this and then the signal will be high when water is detected.

6

i am 95% sure i tried both modes

7

inPin is 8, it will never be 1.

8

so how would you code it

9

does this input need to be configured with the internal pull-up resistor enabled --- INPUT_PULLUP?

10

Try:

void loop()
{
  digitalWrite(5, digitalRead(inPin));  
  Serial.println(digitalRead(inPin));
  delay(2000);
}
11
  • OP, (as mentioned) do you understand why this is wrong ?
  if (inPin == 1) {
    digitalWrite(5, HIGH);
  }
1 Like
12

Correctly

13

yep because the pin will always = 8 so it can never =1

1 Like
14

i will test all these out when i get home thanks for the help

15

Update: it turns out that the code was fine and one of the jumpers wasn't plugged in properly i feel like an idiot

1 Like
16

Don't. We've all been there. I was there twice today.
If you're not making mistakes, you're not learning anything. By the way, if that's your cat : what a sweet little face :heart_eyes_cat:

17

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