An Arduino based count-down timer for the lightning talk event 'Hack And Tell'.
C++ Arduino C
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README.md
androidlogo.cpp
androidlogo.h
applause.bmp
applause.cpp
applause.h
circuit.fzz
circuit_breadboard.png
circuit_diagram.png
hackandtell.ino
hntlogo.bmp
hntlogo.cpp
hntlogo.h
pizza.bmp
pizza.cpp
pizza.h

README.md

Berlin Hack-And-Tell Count-Down Timer

Berlin Hack-And-Tell is a monthly event at c-base, Berlin. Hackers can hop on stage to show off their projects. Everyone has exactly 5 minutes for their presentations. This count-down timer keeps track of the time.

Project Description

The Hack and Tell Logo on a Green Screen

This repository contains the C++ code for an Arduino-based count-down timer. It displays a five minute countdown with big numbers on a TV screen. It uses Arduino TVOut library (see: http://code.google.com/p/arduino-tvout/ ) for PAL or NTSC composite video output. The time duration of the count-down can be changed in the source code. When the count-down is over it presents a flashing message ("APPLAUSE") on the screen. In addition, a MOSFET can be attached to a PWM-capable pin of the arduino. We use this to light a big "APPLAUSE" sign with several LEDs.

The program has a graphical menu which is controlled by a classic digital joystick oder gamepad like those found on the Atari 2600 or those for the Commodore 64. We use an ancient Competition Pro joystick like this one:

Competition Pro

Apart from the count-down function the code implements a simple serial monitor and a message display.

Circuit diagrams

Breadboard circuit view

Circuit Diagram