Let's Get Started - Logiblocs Alarm Kit Inventors Manual

LIE DETECTOR
We can use the Alarm Kit to make a Lie Detector. This uses the effect that
when people do not tell the truth they
usually sweat which increases the
electrical conductivity of their hands.
Step 1
Make two hand sized aluminium foil
pads and lay them side by side on a table,
making sure that they do not touch. Fix the
metal ends of the Jack Plug wires with some
sticky tape, one to each piece of foil.
Step 2
Put the blocs together as shown and
plug in the Jack Plug into the IN block.
Step 3
Now keeping the pads separate, place one or
two fingers on one pad. Get someone to
ask you some questions about you or
your friends. Each time you give
either a true or false answer put one or two fingers from your other hand
onto the second pad. The sound level of the BLEEP will change depending
on how hard you press or how much your hands are sweating (because of
telling lies!).
You can also do this with two people. Put
your right hand on the right pad while your
friend puts his or her left hand on the left
pad. Ask each other questions and then join
your free hands together. You will find that the
Logiblocs can be triggered through you both!
This is because your bodies also can
conduct electricity.
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LET'S GET STARTED

The first thing to do is to get to know the Logiblocs and make sure that they
are working OK. You will need a 9V DC 6F22 or 6LR61battery pack.
Step 1
Clip your battery on to the
BATTERY CONNECTOR
Step 2
Plug in the Jack Plug to the IN
leaving the wires loose.
JACK PLUG
Step 3
Plug together these Logiblocs
CROSS
BATTERY
CONNECTOR
IN
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