View source for Darkroom/Timer

The darkroom at the lab has a custom talking timer which understands multi-step processes and talks so that it is easy to use even in darkness.

== Components ==
* Timer itself, located above the left side of the sink near the ceiling
** Raspberry Pi 2
** Adafruit LCD Plate
** Proto Plate with RS232 level shifter for barcode reader
* Speaker above the timer
* 2D barcode reader mounted on the shelf aimed at the wall
* Control panel below the sink with the following controls:
** Large green SELECT button
** Navigation left/right control
** Active/Standby toggle switch
* Aztec Code barcodes on each process sheet, which contain all timing information

== Instructions ==
* Set the Active/Standby switch on the timer control panel to Active
* Scan the barcode for the process you want under the crosshairs that appear on the wall
** Barcodes can be found on instruction sheets for each process that are hung up behind the door.
* Double check that the timer is displaying the process you want to run, and press the big green SELECT button
* The timer may ask if you want to adjust the time for specific steps.
** If you don't, just press SELECT.
** If you do, use the navigation buttons to change to Yes and press SELECT.
* The timer will show and read out each step as it's ready.
* Press SELECT to start each step.
** If you want to run a different step instead, use the navigation buttons to scroll through.
* To abort a step in progress, hold the SELECT button until you hear a buzzer.

== Other Information ==
To generate new barcodes, you can use the [http://htmlpreview.github.io/?https://github.com/hacklabto/darkroomtimer/blob/master/generator/timergen.html Darkroom Timer Barcode Generator]