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Potentiometer  used for time select.\n* Author: Gavin Lyons\n* URL: https://github.com/gavinlyonsrepo/timer_arduino_two\n\n\nlibraries used\n--------------------\n\n None \n\n\nSoftware Used\n------------------\nArduino IDE 1.8.5\n\nEagle 9.3.0\n\n\nParts List\n------------------------------\nThe schematic drawn in Eagle is in documents section. \n\nYou will need following parts.\n\n\u003e\n\u003e ATmega328p micro-controller as per schematic or alternatively a Arduino uno/nano module.\n\u003e\n\u003e Resistors: 20 ohms , 220 ohms, 660 ohms, 10K  , 500ohms X 7, 1K X 4\n\u003e\n\u003e Transistors 4 X 2N2222 NPN\n\u003e\n\u003e One 4 digit seven segment module  (SMA420564)\n\u003e\n\u003e one 50 k potentiometer \n\u003e\n\u003e one pushbutton\n\u003e\n\u003e One on/off SPST switches\n\u003e\n\u003e One piezo buzzer passive\n\u003e\n\u003e One 16 Mhz crystal\n\u003e\n\u003e One Lm317 voltage regulator\n\u003e\n\u003e Capacitors. two x 22pF, three x 100nF , 1uF\n\u003e\n\nFeatures\n------------------------\nThe user selects the countdown time (1-99 minutes) with the potentiometer then starts with the pushbutton.\nTime remaining is displayed on seven segment display. When finished the buzzer is activated and Zero displayed on 4 digit 7-segment display for a few minutes, The unit then shuts off  display and buzzer.\n \n\nLED Array Pin Layout\n\n| Pin Uno | Pin Atmega  | 7 Segment pin  |   \n| --- | --- | --- | \n|  D2 |  PD2 | a  |  \n|  D3 |  PD3 | b  |   \n|  D4  | PD4  | c  |    \n|  D5 |  PD5 |  d |   \n| D6  |  PD6 |  e |     \n|  D7 |  PD7 | f  |  \n| D8  | PB0  |  g |     \n|  n/c |  n/c | p |       \n| D10  | PB2  |  d4 |   \n| D11  | PB3  |  d3 |   \n| D12  | PB4  |  d2 |  \n| D13  | PB5  |  d1 |     \n \n\nThe 4-digit seven segment display (SMA420564 or SM420564) is a common-cathode display.  \n4 Digit 7 Segment Cathode Red LED Display 0.56\" SM420564. \n\n![ScreenShot seven segment ](https://github.com/gavinlyonsrepo/timer_arduino_two/blob/master/documentation/image/7segpinout.png)\n \n \nSchematic\n---------------- \n\n![ScreenShot schematic one ](https://github.com/gavinlyonsrepo/timer_arduino_two/blob/master/documentation/eagle/timer_two_arduino.png)\n\n\nCopyright\n---------\nCopyright (C) 2019 Gavin Lyons \nsee LICENSE.md in documentation section \nfor more details\n\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fgavinlyonsrepo%2Ftimer_arduino_two","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fgavinlyonsrepo%2Ftimer_arduino_two","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fgavinlyonsrepo%2Ftimer_arduino_two/lists"}