26
Build the circuit as shown, initially setting the switcher (
S6
) to
the middle setting. Mount the 1.75” gear on the geared motor
(GM) with the rubber rings to keep it from sliding out of position,
place it on the mini car frame, and connect it to the circuit
using the red & black jumper wires. Now use the switcher to
make the mini car go forward, backward-turning, or stop. You
can follow the car around the room or table while using
S6
to
control it. Be careful to follow it closely so you don’t over-extend
the jumper wires, and to keep it from falling off the table.
Modify the preceding circuit to include the red/yellow
LED (
D10
) and melody IC (
U32
), mounted on the car using
two 2-snap wires. A tune plays and the LED lights yellow
when the car is going forward, or the LED lights red when the
car goes backward-turning.
Rubber rings
Set the switcher (
S6
) to the top or bottom position. Watch as one LED fades out after a few
seconds, then set the switcher to the other side. Do this several times.
PROJECT 29
• Fade Out
PROJECT 30
• Mini Car with Wired Control
PROJECT 31
• Wired Control Car with Light/Sound
The 470
μ
F capacitor (
C5
) stores electricity, and keeps the
disconnected LED on for a few seconds after you flip the switch.
See project 3 if you need to recharge the battery (
B4
).