Price - Stock No 20
The objective of the Maze is to find a safe path from the IN arrow to the OUT
arrow. The safe path is indicated by a GREEN LED, and the RED LED indicates
disaster. There is a buffer zone mostly - but not always- between the red and
green zones. The buffer zone is indicated by the ORANGE LED. The rule that
applies is that you can move forwards or backwards, sideways and diagonally, but
only one step at a time. If you wish you could connect a buzzer or construct a
sound effects project and connect them into the Orange and the Red circuits.
- Set out the grid pattern at 10mm intervals, and mark suitablepositions for
the three LEDs and the battery tamer holding screw. You will also need a small
hole for the black lead of the battery snap to feed through.
- Drill three holes D6.35mm (1/4 inch) and push the LED Mounts into them.
Push the LEDs from the under-side into the mounts, but make sure that the
SHORT LEGS are all to the grid side. Cut a short piece of wire from the roll
in your Kit and lie it along the short legs, soldering the wire to each short
leg. Take the 390R resistor and solder one leg to the wire joining the LEDs.
- Drill a small hole and feed the black lead of the battery snap through.
Solder this lead to the free leg of the resistor. This means that the one
resistor will meter the current to all three LEDs, on a common 0 Volt rail (or
earth if you like). For a 9 Volt supply, a 390 OHM resistor will allow around
20 milliamps of current to flow through the LEDs. (OHM's Law is used to
calculate this). This is the specification for LEDs.
- Strip the insulation from each end of the coloured wires and solder one
end of each to long leg of the matching colour LED.
- Drive flat-head nails through the plywood at each of the points of the
- Design your maze and mark the path of the red track.
- Using long-nose pliers wrap the end of the wire tightly round the first
nail. Lie the wire in and out of successive nails in the path, wrapping it
right round every 3rd or 4th nail to keep it tight. Try to ensure that the
wire touches each nail. Repeat this process for each of the Orange and Green
- Solder the free ends of the coloured wires to their respective path wires.
- Solder the alligator clip to the Red wire of the battery snap, and attach
the battery tamer with its screw.
- Connect a battery and test that a LED lights up when each nail is touched
with the alligator clip. For any that don't light push the wire against the
nail. For troublesome ones solder the wire to the individual nail.
- Test your maze for its safe path.
- Cut some coolite for a backing piece and gently tap the nails so the
plywood firms down evenly onto the coolite.
- Mark the ENTRY and EXIT and your maze is ready.
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