Lane Tech HS: Ingredient availability checker

Using a metal touch sensor, I've essentially made a button that notifies the user when it's been released over a certain time threshold.

BeginnerWork in progress201

Lane Tech HS: Ingredient availability checker

Things used in this project

Hardware components

Resistor 220 ohm

Particle Argon

Jumper wires (generic)

Metal Touch Sensor

Software apps and online services

Particle Build Web IDE

IFTTT - Gmail service

Story

As someone who frequently bakes, a common issue I have is not realizing when I've used up an ingredient. To combat this, I decided to create something that notifies me when an ingredient is out. I did this by creating a giant "button" with a metal touch sensor that e-mails me when a food item of my choice has not been replaced on it for a certain amount of time.

Video:

In practice, a bag of flour would be used instead of my hand; however, since this model doesn't have much protecting the hardware, I didn't want to get food too near it.

IFTTT Setup:

Schematics

Code

Sensor timer

const int touchPin = D7; 
int state;
int lastState;
int releaseMoment= 0;
int idleTime = 0;

void setup ()
{
  Serial.begin(9600);
  pinMode (touchPin, INPUT) ;
  Particle.variable("idleTime", idleTime);
}

void loop() 
{
  state = digitalRead(touchPin); 
  if(state != lastState)
  {
    update();
  }
  idleTime = millis() - releaseMoment;
  lastState = state;
}

void update ()
{
   if (state == LOW) 
        {
            releaseMoment = millis();
        }
}

Credits

Margaret Donohoe

3 projects • 1 follower

Contact

Daniel Law

46 projects • 9 followers

Teacher. Maker. Citizen of the planet.

Contact

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Lane Tech HS: Ingredient availability checker