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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.


  • Timer itself, located above the left side of the sink near the ceiling
    • Raspberry Pi 2
    • Adafruit LCD Shield
  • Speaker above the timer
  • Control panel below the sink with the following controls:
    • Large green Select button
    • Navigation left/right control
    • Active/Standby toggle switch


  • Set the Active/Standby switch on the timer control panel to Active
  • Scan a barcode under the crosshairs that appear on the wall

To generate new barcodes, you can use the Darkroom Timer Barcode Generator