User manual

55 2 Design and Assembly
Piezo speaker
The kit comes with a piezo buzzer. In order to emit the
generated sounds with sufficient volume, the buzzer has
to oscillate a membrane. To this end, you have to build a
speaker yourself. The material for the membrane must not
conduct electric currents and has to be as thin and inelastic
as possible. The best option is to use a drinking cup or a
yoghurt cup made from thin plastics.
Cut the cup 20mm above the bottom. You will work
with the bottom part. Trim the edge so that two opposing
straps of 10mm length and 10mm width remain.
Fig. 2.6:
Battery clip and
piezo buzzer