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gavinlyonsrepo committed Jul 2, 2018
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Overview
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* Name: timer_arduino
* Title : Countdown Timer, arduino based.
* 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 tow different ino files.
* Note: Two alternative designs, two different ino files.

libraries
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* https://github.com/avishorp/TM1637
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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.A switch can be used if user wishes to switch on/off display to save battery power.
Two alternative designs, two different ino files and schematics. Design one uses the nano, design two the attiny85.


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

![ScreenShot schematic one ](https://github.com/gavinlyonsrepo/timer_arduino/blob/master/documentation/eagle/tm1637.jpg)

Design number two : file: timer_attiny85_arduino.ino based on attiny85.

![ScreenShot schematic two ](https://github.com/gavinlyonsrepo/timer_arduino/blob/master/documentation/eagle/tm16372.jpg)
![ScreenShot schematic two ](https://github.com/gavinlyonsrepo/timer_arduino/blob/master/documentation/eagle/timer16372.jpg)

Copyright
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