Darkroom Timer April 99 Stan Ockers (ockers@anl.gov) Modified by Vassilis Papanikolaou, April 05 Counts down 0-99 min and 0-59 sec giving an alarm at 0 initial counts are held in data EEPROM setable with one button RBO-RB3 to bases of transistors connect to common cathode of displays. RA0-RA3 to 1,2,4,8 BCD inputs of CD4511 7 segment latch and driver. RB7 to start pushbutton used to start countdown and silence alarm. RB6 goes to time set pushbutton use to sucessively set the digits. RA4 with pull-up resistor goes to PB to 15 starting counts RB4 goes to Dot Points RB5 goes to Relay

DarkroomTimer PCB.pdf
DarkroomTimer Schematic.pdf
DarkroomTimer Silk.pdf
DarkroomTimer.doc
DarkRoomTimer.asm
DarkRoomTimer.hex

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