The “RokClock” was created for a solo singer/songwriter that wanted to keep close track of his time on stage during performances.
It’s a count down timer that has multiple count down presets: 15 min, 30 min, 45 min, 60 min and 90 min.
Because it’s an LCD display, it can be seen in full daylight.
For dark environments a switch is used to turn on the back-light LEDs.
The display is a two digit LCD segment type that requires special timing known as frames.
The necessary timing to drive the LCD is based on the this app note : http://www.atmel.com/images/doc2569.pdf
The microcontroller used in the project is a ATMEGA328P, and is the code is based on Arduino.
The PCB is designed to fit in a Hammond 1590B which is a common case used in guitar effect pedals.
It is power from either a 9v Battery or a 12v DC power adapter.
A 3D model was created in SketckUp to make sure all of the components would fit in the case. Also included in the SketchUp design is measurements for all holes that need drilled.
The Board and Schematic in Eagle Format
