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Countdown Timer: Range 1-99 minutes. Output: time (mm:ss) to seven segment display(TM1637) and Audio to Buzzer. Input: Push button to start. 10K Pot used for time select.

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Table of contents

Overview

  • Name: timer_arduino
  • Title: Micro-controller Countdown Timer
  • Description: Countdown Timer: Range 1-99 minutes. Output time (mm:ss) to seven segment display(TM1637) and Audio to Buzzer. Input: Push button to start. 10K Pot used for time select.
  • Author: Gavin Lyons
  • Note: Two alternative designs, two different ino files. One with Attiny85 IC the other with an arduino nano.

Library

  • TM1637Display.h to drive the Tm1637 module Version 1.1.0 link

Parts List

The schematic drawn in eagle is in documents section.

You will need following parts.

Arduino based board with 4 digital pins and 1 analog pin. (In this case nano or Attiny85)

Resistor: 220ohms

tm1637 seven segment I2C module

one 10 k pot

one pushbutton

One on/off SPST switches

One piezo buzzer

oNE 100nF capacitor

tm1637 7-segment I2C module. module

Features

The user selects the countdown time (1-99 minutes) with the pot then starts with the pushbutton. Time remaining is displayed on seven segment display. When finished the buzzer is activated and done displayed on 7-seg. Two alternative designs, two different ino files and schematics. Design one uses the nano, design two the attiny85.

Design number one : file: timer_arduino.ino based on arduino nano.

ScreenShot schematic one

Design number two : file: timer_attiny85_arduino.ino based on attiny85. The current consumption of this circuit is 9mA in countdown state and 11mA in alarm state. The brightness of display is set to a low setting in the program.

ScreenShot schematic two