#SPEAKER TIMER CLOCK PDF#

8 resistors or the appropriate size for your LEDs. 4 momentary push buttons for reset, start/stop, minute+, and minute-.Ĥ. Also, if you put a piece of paper in front of the clock you can read it from a wider angle.ģ. If I had it to do over I would probably use clear lensed LEDs to make it easier to read the clock. 58 LEDs or your favorite color (14/digit *4 digits + 2 for colon). I used Lexan for mine, but some thin plywood or most any flat stock that you can drill easily should work.Ģ.

For the timer itself you will need a material to hold the LEDs. If you are interested in using interrupts with the AVR this project is a good tutorial. This is a fun and cheap project that makes use of AVR interrupts. This allows for some fun (say firing up a NERF rocket launcher as you get closer to quitting time). It allows a default time to be set, can be paused, and will put out 5 Volts on several IO lines when 10, 5, 1, and 1 minutes are remaining. It uses a 4-digit charlieplexed LED (pseudo 7-segment) display and is driven by a AVR ATMega328 or an Arduino. This is a fun speaker timer I made for some upcoming conferences.

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#SPEAKER TIMER CLOCK PDF#

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Speaker timer clock