Circuit Playground Express comes with seven capacitive touchpads. Each of them can be connected to any object that can conduct electricity, and touching that object will, in turn, trigger the sensor. You can use good electrical conductors, such as metal, and even weaker ones, such as a banana.
Water conducts electricity, and the surfaces of many fruits have enough moisture for the touchpads to detect a touch event. Many fruits, such as bananas, limes, oranges, and apples, will do the job. You can use alligator clips to connect the fruit to the touchpads. The following photograph shows a bundle of alligator clips:
These alligator clips come in a variety of different colors. It's a good idea to use a different color wire for each touchpad. It will make it easier to trace which fruit is connected to which touchpad. In this project, we will...