Team:ETH Zurich/Decoder

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Navigate through Overview, Design and Results

Principle

Our decoder aims to distinguish between the most common indoor and outdoor lightsources. These include for example sunlight (with UV), outdoor shade, room light and darkness. All of them have a unique footprint of both intensity and the ratio of blue to red light. This might facilitate the reliable detection of sunlight with UV by combining only two inputs, the light receptors LovTAP and Cph8.


Boolean logic

The input (red and blue light) is converted into TetR and LacI using a NOT-gate. The truth table demonstrate our aim of the decoder.

Truth table of our Decoder
Red Light Blue Light TetR LacI Output
0 0 1 1 No Output
1 0 0 1 Red Pigment
0 1 1 0 Green Pigment
1 1 0 0 PABA and Violet Pigment

This can be simplified to the following logics:

  • pABA and Violet = NOR(LacI, TetR) = NOT(LacI) AND NOT(TetR) = Blue AND Red
    • Note that simultaneously to the production of pABA and the violet pigment also cI, a third repressor, is produced. cI is integrated in the other gates.
  • Red pigment = NOT(PABA and Violet) AND NOT(TetR) = NOR(cI, TetR) = NOT(cI) AND NOT(TetR) = LacI AND NOT(TetR) = NOT(Blue) AND Red
  • Green pigment = NOT(PABA and Violet) AND NOT(LacI) = NOR(cI, LacI) = NOT(cI) AND NOT(LacI) = NOT(LacI) AND TetR = Blue AND NOT(Red)

A detailed overview of the logic gates can be found [http://en.wikipedia.org/wiki/Logic_gate#Symbols here].


By using the NOR-gate our decoder can be represented as follows:

Figure 1: Boolean logic of Decoder.



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