WatsOn

One part of our biosensor system Cellock Holmes are our agar chips containing our engineered sensing cells that fluoresce in the presence of the pathogen Pseudomonas aeruginosa. However, bacteria are small and the fluorescent signal cannot be seen with the naked eye. Thus the central question "What's on the chip?" remains. To answer this question we present our measurement device WatsOn.

WatsOn fulfills several tasks in our system:

• incubate the sensing cells and the sampling chip
• prevent escape of potentially sampled pathogens and our genetically engineered cells
• illuminate the chip with the right excitation wavelength for GFP
• take a photo of the chips
• analyze the fluorescence signal
• give feedback to the user about the presence or absence of P. aeruginosa

Measurarty

Measurements

Software Evaluation

Secret Ingredients

Arduino Sketchbook (.ino)

Build your own WatsOn

If you want to create your own WatsOn at first check the following list of necessary devices.

Wiring of our device

	Start building your own WatsOn by assembling the base plate, the sides and the interior wall.
	Fix the Peltier heater on the back of the aluminum block and place it in the hole of the interior wall. Arrange the 4x4 450nm LEDs and the 2x3 480nm LEDs
	Assemble the camera holder with the camera and the corresponding filter slide on the lower part. Over the camera you can place the temperatur sensor for measuring the indoor temperature. Finally put the fan on the back of the camera holder.
	Connect the electronic components on the outside and the inside according to the wiring diagramm.
	Put together the drawer.
	Position the front panel and insert the drawer.
	Place the temperatur sensor for the aluminium block tempteratur directly on the block and put the back panel in front of it.
	Add the display and apply some stickers to enjoy your custom-made WatsOn.