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Chug Meter for St. Patrick's Day by © GPL3+

Let’s settle once and for all - who is the fastest chugger of ‘em all?

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About this project

Let’s settle once and for all - Who is the fastest chugger of ‘em all? Chug Meter for st. Patrick's Day

St. Patrick’s Day is here and it’s given us a good excuse to drink beer at work!

For this festive occasion we give you: The Chug-Meter.

Now we can settle once and for all - who is the fastest chugger of ‘em all?

*Drink Responsibly*

First of all, we recommend you start drinking after you make the counter. It may seem obvious, but we’re just making sure here.

How to assemble the circuit

We went easy on you here. The circuit is pretty simple:

FSR (Force sensing Resistor)


Piezo Speaker

7-Segment display

The magic link will redirect you to, where you will find the pre-selected components.

As is always, you can change the electronics. Here are just a few examples:

  • Replace the 7 segment with an LCD screen
  • Replace the FSR with an IR diode
  • Add an RGB LED to the circuit

And basically go wild - it's St. Patrick's day!

After you click Generate go through the 3 parts of the reply: BoM, Step-by-step wiring guide and Code. Follow the instructions carefully and let us know if you need any help by commenting below.

Once everything is up and running, you’ll need to:

  • Replace the sample code you got in the reply with the code attached in this tutorial. Copy the code and paste it into the Firmware tab of the sample code from This way, all the component libraries will remain as they are, and only the main function will change.
  • Tape the FSR (Force Sensitive Resistor) under the beer coaster. Once the force is released (=the pint is lifted) the counter starts running. When the pint is put back on the coaster - the timer stops and you can reset it with the button.
  • Start drinking :)

Happy St. Patrick’s Day! Drink Responsibly!


Code for Chug MeterArduino
Replace the setup and loop functions from the code you got from, with the code below
int start_flag = 0;
bool glassState = 0;
long finalTime, time0;
int timer;

/* This code sets up the essentials for your circuit to work. It runs first every time your circuit is powered with electricity. */
void setup() {
  // Setup Serial which is useful for debugging
  // Use the Serial Monitor to view printed messages


  s7s.clearDisplay();  // Clears display, resets cursor
  s7s.setBrightness(255);  // High brightness
  s7s.setDecimals(0b00010000);  // Sets colon and apostrophe, see .cpp file for reference

/* This code is the main logic of your circuit. It defines the interaction between the components you selected. After setup, it runs over and over again, in an eternal loop. */
void loop() {
  // Read FSR resistance value. try also fsr.getResistance()
  // For more information see Sparkfun website -
  // Note, the default Vcc and external resistor values for FSR calculations are 5V ang 3300Okm, if you are not
  //       using these default valuse in your circuit go to FSR.cpp and change default values in FSR constructor
  float fsrForce = fsr.getForce();
  //Serial.print(F("    Force: ")); Serial.print(fsrForce); Serial.println(F(" [g]"));

  //Read pushbutton state.
  //if button is not pushed function will return LOW (0). if it is pushed function will return HIGH (1).
  //if debounce is not working properly try changing 'debounceDelay' variable in Button.h
  //try also pushButton.onPress(), .onRelease() and .onChange() for debounce.
  bool pushButtonVal = pushButton.onPress();
  //Serial.print(F("Val: ")); Serial.println(pushButtonVal);

  //Reset the time using the push-button
  if (pushButtonVal == 1) {
    start_flag = 0;
    glassState = 0;
    //Start timer
    time0 = millis();

  //set time state
  if (start_flag == 0) {
    //If the galss is placed
    if (fsrForce > 50)
      glassState = 1;
      //Start timer
      time0 = millis();

    //If the glass was picked up
    else if (fsrForce < 50 && glassState)
      finalTime = millis() - time0;
      start_flag = 1;
  //the glass was picked, run the timer
  else if (start_flag == 1)
    //while you are drinking, display the time on the 7-Seg display
    if (fsrForce < 100)
      finalTime = (millis() - time0) / 10;

    //Finish drinking, stop timer, print final time, and play hooray sound
      start_flag = 2;
      finalTime = (millis() - time0) / 10;
      piezoSpeaker.playMelody(piezoSpeakerHoorayLength, piezoSpeakerHoorayMelody, piezoSpeakerHoorayNoteDurations);

  //always print final time until reset button is pushed



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