Elenco Electronics rc snap rover Bedienungsanleitung PDF herunterladen (Seite 36)

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Project #71

OBJECTIVE: To turn a lamp on and off using light.

Cover the unit, turn the slide switch (S1) on, and notice that the

lamp (L1) is off after a few seconds. Place the unit near a light and

the lamp turns on. Cover the photoresistor (RP) and place it in the

light again. The lamp will not turn on. The resistance of the

photoresistor decreases as the light increases. The low resistance

acts like a wire connecting point C to the positive (+) side of the

battery (B1).

Light-Controlled Lamp

OBJECTIVE: To turn a lamp on and off using the voltage

generated from a photoresistor.

Project #73

Use the circuit from Project #71. Remove the photoresistor (RP) and

connect the whistle chip (WC) across points A & B. Turn the slide switch

(S1) on and clap your hands or talk loud near the whistle chip (WC), the

lamp will light. The whistle chip has a piezocrystal between the two

metal plates. The sound causes the plates to vibrate and produce a

small voltage. The voltage then activates the music IC (U1) and turns

the lamp on.

Project #72

Voice-Controlled Lamp

OBJECTIVE: To turn a lamp on and off using the voltage

generated when a motor rotates.

Use the circuit from Project #72. Remove the whistle chip (WC) and

connect the motor (M1) across points A & B. Turn the slide switch (S1) on

and turn the shaft of the motor and the lamp (L1) will light. As the motor

turns, it produces a voltage. This is because there is a magnet and a coil

inside the motor. When the axis turns the magnetic field will change and

generate a small current in the coil and a voltage across its terminals. The

voltage then activates the music IC (U1).

Motor-Controlled Lamp

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Elenco Electronics rc snap rover Bedienungsanleitung Seite 36