Lie detector
YOU WILL NEED
your humidity detector
and additional household
items: adhesive bandage,
test subject :)
HERE’S HOW
1. Find a test subject and use the
bandage to tape the two loose wire
ends to the palm of his or her hand.
Carefully position the wires so their
ends are close to each other but do
not touch. Before you start the lie
test, the detector’s red LED should
be lit.
2. Start by asking your test
subject some harmless
questions, and then
proceed to trickier and
more awkward ones.
As long as the red LED stays lit, the test
subject is telling the truth. But when the
green LED lights up, he or she might be
lying.
When people lie, their palms start to
sweat. This film of sweat on the palms
causes enough moisture to accumulate
for your circuit to be able to detect and
signal this.
WHAT’S HAPPENING?
EXPERIMENT
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