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Project #282
Place the fan on the motor. Turn the switch on, the motor starts
spinning. As you move your hand over the photosensitive resistor, the
motor slows. Now place a finger on top of the photosensitive resistor
to block the light. The motor slows down. In a few seconds the motor
speeds up again.
Start-Stop Delay
Project #283
OBJECTIVE: To build a circuit to indicate if you have
Turn the switch on. If there is light on the photosensitive resistor the
red LED will not light. Place your finger over the resistor and now the
red LED lights. A simple mail notifying system can be made using this
circuit. Install the photosensitive resistor and the green LED inside the
mailbox facing each other. Place the red LED outside the mailbox.
When there is mail, the light is blocked from the photosensitive resistor
and the red LED turns on.
Mail Notifying System
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