Motor-Controlled Time Delay LED

Project Number: 76

OBJECTIVE: To control an LED using a motor.

Description: Use the circuit from Project #75. Remove the whistle chip (WC) and connect the motor (M1) across points A1 and C1 on the base grid. Turn the slide switch (S1) on and turn the shaft of the motor and the LED (D1) will light. As the motor turns, it produces a voltage. There is a magnet and a coil inside the motor. When the axis turns, the magnetic field will change and generate a small current across its terminals. The voltage then activates the music IC (U1).