Published September 23, 2022

Dryer Notifier

A small device that can be put on a dryer to give a notification when the dryer has finished.

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1 / 5 • On/Off Light Indicator

Video Link: https://youtube.com/shorts/WS1_VS1gYc0

My project is a dryer notification device, made to make a sound upon a dryer cycle ending. This device could have applications outside of use with a dryer, but a dryer was the machine it was intended for use with.

The device consists of a Circuit Playground Express board, a battery, two alligator clip wires, a toggle switch, a red solo cup, and pieces of painter's tape.

The red solo cup acts as the chassis for the components. A small square hole was made into it to mount the toggle switch to. Alligator clips connect the switch to pins on the board. Painter's tape keeps the switch and board mounted to the top of the cup as well as keeps the battery mounted to its side.

On the code side of things, the board reads for a signal from the A1 pin. If its HIGH then a light is turned on to signify its been turned on, otherwise if the board reads LOW then it turns off the light. While the A1 pin reads HIGH, the accelerometer functions are called and assigns values to float variables for the X and Y axis. A conditional operator using absolute value functions checks to see if both the X and Y accelerations are less than 1.0 which signifies the board is still. These checks occur at a 100ms interval. If there are 20 consecutives successful checks for whether the device is still, then a tone is played signifying the dryer has stopped moving and thus the dryer cycle has ended. The no movement check streak is in place to make up for the interval at which the device checks the accelerometer's reading, as it might happen to catch it when both X and Y accelerations are less than 1.0 but the dryer has not actually stopped moving.

DryerNotification.ino

#include <Adafruit_CircuitPlayground.h>

float X, Y;
int noMotionStreak = 0;

void setup() {
  Serial.begin(9600);
  CircuitPlayground.begin();
  CircuitPlayground.setAccelRange(LIS3DH_RANGE_2_G);
  pinMode(A1, INPUT_PULLUP);
}

void loop() {

  if (! digitalRead(A1)) {                                // On/Off Switch
    CircuitPlayground.redLED(HIGH);                       // On Indicator
    X = CircuitPlayground.motionX();
    Y = CircuitPlayground.motionY();

    Serial.print("X: ");                                  //Accelerometer Readings for Testing
    Serial.print(X);
    Serial.print("  Y: ");
    Serial.println(Y);

    if ((abs(X) < 1.0) && (abs(Y) < 1.0)) {                //Checks if board has stopped moving and is flat
      noMotionStreak++;                                    //Adds a successful check if board has stopped moving
      if (noMotionStreak >=20){                            //Checks no motion streak, after 20 successful checks board plays "finished" tone every 10sec until turned off
        noMotionStreak = 0;
        while(! digitalRead(A1)) {
          CircuitPlayground.playTone(1000, 3000);
          delay(10000);
        }
      }
      
    }
    else {
      noMotionStreak = 0;                                   //Resets no motion streak if motion is detected before success
    }
  }
  else {
    CircuitPlayground.redLED(LOW);
  }

  delay(100);
}

Dryer Notifier

Story

Code

DryerNotification.ino

Credits

TriOmega

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Dryer Notifier

Dryer Notifier

Story

Code

DryerNotification.ino

Credits

TriOmega

Comments

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