Elenco R/C Snap Rover&reg - Manual (Page 19)

-18-
Build the circuit at left and connect the jumper wires to it, but leave the loose
ends of the green and purple jumpers unconnected for now. There is one
more part you need and you are going to draw it. Take a pencil (No. 2 lead
is best but other types will also work). SHARPEN•IT, and fill in the shape
below. You will get better results if you place a hard, flat surface directly
beneath this page while you are drawing. Press hard (but don’t rip the
paper), and fill in the shape several times to be sure you have a thick, even
layer of pencil lead.
Turn on the switch and take the loose ends of the jumpers, press them to the
shape and move them around over the drawing. If you don’t hear any sound
then add another layer of pencil lead, or put a drop of water on the jumper
ends to get better contact. You can draw different shapes if you like.
Option A: Replace the horn (W1) with the LED•(D4, “+” side on the left), to
shine a light instead of making noise.
Option B: Instead of using a pencil drawing, touch the metal ends of the
jumper wires with your fingers to see how your body can conduct electricity!
Project #17
OBJECTIVE: To draw a missing component.
Pencil Buzz
OBJECTIVE: To draw a missing component.
Stay-on Pencil Light Project #18
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This is the same circuit as project# 17, but it stays on if you turn it off. Build
the circuit at left and connect the jumper wires to it, but leave the loose ends
of the green and purple) jumpers unconnected for now. There is one more
part you need and you are going to draw it. Take a pencil (No. 2 lead is best
but other types will also work). SHARPEN•IT, and fill in the shape below. You
will get better results if you place a hard, flat surface directly beneath this
page while you are drawing. Press hard (but don’t rip the paper), and fill in
the shape several times to be sure you have a thick, even layer of pencil
lead.
Turn on the switch and take the loose ends of the jumpers, press them to the
shape and move them around over the drawing. It will take a few seconds for the
LED (D4) to turn on, but then it will stay on for a long time after you remove the
jumper wires from the drawing. If the light never comes on then add another layer
of pencil lead, or put a drop of water on the jumper ends to get better contact.
Option A: Replace the LED (D4) with the horn•(W1, “+” side on the left), to
make noise instead of shining a light!
Option B: Instead of using a pencil drawing, place the loose ends of the
jumper wires into a cup of water to make a water alarm!
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VER•
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