version 1.1-2

Author: gavinlyonsrepo

README.md

@@ -7,7 +7,7 @@ Overview
 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.
 libraries
 --------------------------
 * https://github.com/avishorp/TM1637
@@ -29,29 +29,34 @@ 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. (eg nano)
+> Arduino based board with 4 digital pins and 1 analog pin. (In this case nano or Attiny85)
 >
-> Resistors: 220ohms 
+> Resistor: 220ohms 
 >
 > tm1637 seven segment module
 >
 > one 10 k pot
 >
 > one pushbutton
 >
-> two on/off SPST switches
+> One on/off SPST switches
 >
-> One buzzer
+> One piezo buzzer
 >
 
 Features
 ----------------------
-
-![ScreenShot schematic](https://github.com/gavinlyonsrepo/timer_arduino/blob/master/documentation/eagle/tm1637.jpg)
-
 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.
 
+
+Design number one :  file:  timer_arudino.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)
 
 Copyright
 ---------

documentation/CHANGELOG.md

@@ -1,7 +1,9 @@
 ### Changelog
 
 * version 1.0-1 June 2018
-	first release
+	* first release
 
+* version 1.1-2 July 2018
+	*  Added alternative attiny85 design
 
 

documentation/eagle/timer.s#1

@@ -2293,7 +2293,6 @@ Source: http://download.siliconexpert.com/pdfs/2005/02/24/Semi_Ap/2/VSH/Resistor
 <part name="R1" library="pot" library_urn="urn:adsk.eagle:library:331" deviceset="3RP/1610N" device="" package3d_urn="urn:adsk.eagle:package:22726/1" value="10k"/>
 <part name="S2PUSH-BUTTON" library="SparkFun-Switches" library_urn="urn:adsk.eagle:library:535" deviceset="MOMENTARY-SWITCH-SPST" device="-PTH-6.0MM" package3d_urn="urn:adsk.eagle:package:40163/1" value=""/>
 <part name="S1ON-OFF" library="SparkFun-Switches" library_urn="urn:adsk.eagle:library:535" deviceset="MOMENTARY-SWITCH-SPST" device="-PTH-6.0MM" package3d_urn="urn:adsk.eagle:package:40163/1" value=""/>
-<part name="S3ON-OFF" library="SparkFun-Switches" library_urn="urn:adsk.eagle:library:535" deviceset="MOMENTARY-SWITCH-SPST" device="-PTH-6.0MM" package3d_urn="urn:adsk.eagle:package:40163/1" value=""/>
 <part name="U$1" library="Arduino-clone" deviceset="NANO" device=""/>
 <part name="R2" library="eagle-ltspice" library_urn="urn:adsk.eagle:library:217" deviceset="R" device="0204/7" package3d_urn="urn:adsk.eagle:package:13274/1" value="220"/>
 </parts>
@@ -2311,7 +2310,6 @@ Source: http://download.siliconexpert.com/pdfs/2005/02/24/Semi_Ap/2/VSH/Resistor
 <instance part="R1" gate="G$1" x="-2.54" y="68.58"/>
 <instance part="S2PUSH-BUTTON" gate="G$1" x="71.12" y="86.36"/>
 <instance part="S1ON-OFF" gate="G$1" x="-17.78" y="91.44"/>
-<instance part="S3ON-OFF" gate="G$1" x="-10.16" y="38.1" rot="R90"/>
 <instance part="U$1" gate="G$1" x="33.02" y="68.58"/>
 <instance part="R2" gate="G$1" x="53.34" y="76.2"/>
 </instances>
@@ -2333,8 +2331,9 @@ Source: http://download.siliconexpert.com/pdfs/2005/02/24/Semi_Ap/2/VSH/Resistor
 <wire x1="-2.54" y1="55.88" x2="10.16" y2="55.88" width="0.1524" layer="91"/>
 <wire x1="-2.54" y1="63.5" x2="-2.54" y2="55.88" width="0.1524" layer="91"/>
 <junction x="-2.54" y="55.88"/>
-<pinref part="S3ON-OFF" gate="G$1" pin="2"/>
-<wire x1="-10.16" y1="43.18" x2="-10.16" y2="55.88" width="0.1524" layer="91"/>
+<pinref part="TM1637" gate="-3" pin="S"/>
+<wire x1="50.8" y1="20.32" x2="-10.16" y2="20.32" width="0.1524" layer="91"/>
+<wire x1="-10.16" y1="20.32" x2="-10.16" y2="55.88" width="0.1524" layer="91"/>
 </segment>
 </net>
 <net name="N$3" class="0">
@@ -2414,15 +2413,6 @@ Source: http://download.siliconexpert.com/pdfs/2005/02/24/Semi_Ap/2/VSH/Resistor
 <wire x1="45.72" y1="63.5" x2="43.18" y2="63.5" width="0.1524" layer="91"/>
 </segment>
 </net>
-<net name="N$11" class="0">
-<segment>
-<pinref part="TM1637" gate="-3" pin="S"/>
-<wire x1="50.8" y1="20.32" x2="-10.16" y2="20.32" width="0.1524" layer="91"/>
-<wire x1="-10.16" y1="20.32" x2="-10.16" y2="30.48" width="0.1524" layer="91"/>
-<wire x1="-10.16" y1="33.02" x2="-10.16" y2="30.48" width="0.1524" layer="91"/>
-<pinref part="S3ON-OFF" gate="G$1" pin="1"/>
-</segment>
-</net>
 <net name="N$7" class="0">
 <segment>
 <pinref part="R2" gate="G$1" pin="1"/>