Each group needs:

• Arduino
• a power source for the Arduino (e.g., computer or battery pack)
• pH sensor
• a breadboard
• 3 resistors (1000 Ohm)
• 7 jumper wires (female to male and male to male)
• a 3 color RGB SMD LED module (or 3 separate RGB LED lights)
• 2 different solutions to represent cancerous cell cultures with a pH of less than 6.5
• 2 different solutions to represent healthy cell cultures with a pH of 7 or higher
• a control solution of water with a pH of 7
• Smelling Cancer Cells Worksheet
• access to a digital version of the Smelling Cancer Arduino & Sensor Code Sheet (e.g., on Google Classroom)
• distilled water
• a ruler with mm markings

The entire class needs to share:

• 10 solutions to represent unknown cell cultures
• Note: Each group will select 2 solutions from the class set.
• colored pencils for graphing
• something that has an odor (e.g., perfume, food, candle)

To create solutions to represent cell cultures:

• water
• baking soda
• citrus juice or vinegar
• small cups or beakers