Manual

-80-
Project 153
Mirrors on a Wall
Assembly
(adult supervision recommended):
1. Place base grid supports on base
grid A.
2. Place parts on grid C (except the
blue jumper wire) and install into
base grid support on grid A.
3. Install grid B into base grid
supports on grid A.
4. Install a stabilizer between grids B
& C.
5. Install remaining parts on grid A
and blue jumper wire.
6. Place the springs at the locations
shown on grid B.
Turn on the slide switch (S1); the
white LED (D6) should be on. If the
horn (W1) is also on, then dim the
room lights. Place the mirrors in the
mirror holders, and place them in the
springs so that light from the white
LED is reflected from the lower
mirror to the upper mirror, and then
to the phototransistor (Q4); the horn
sounds when you succeed. Once the
mirrors are aligned or close to it, tap
the mirrors gently with your finger so
they bounce, making the sound
beeping.
Notes: It can be difficult to shift the
mirror holder position in the spring,
so to change the position of the
mirror on the spring, remove the
holder from the spring and re-insert
it. To help align the mirrors, dim the
room lights and look at where the
reflected light is shining, and make
adjustments as needed. Be sure the
mirrors are clean.