Velleman EDU02 Manual do Utilizador descarregar pdf (Página 21)

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Required parts: Solar cell, piezo sounder, IR remote control (option).

How it works: Solar cells are

sensitive to infrared light. When hit

by infrared light, they generate a

voltage, like they do with sunlight. IR

remote controls generate a beam of

infrared light when they are operated.

This beam of light is turned on and

off very fast by the internal

electronics of the remote control.

The pattern generated by the on-off

transitions is different for each button

of the remote. This allows the

receiver to recognise each individual

button. In this circuit, the on-off

transistions are translated into sound

by the piezo sounder.

More fun:

Try ‘listening’ to different light sources such as

led lighting, fluorescent lighting, etc...

SOLAR CELL

BUZ1

PIEZO

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