27
Add the red/yellow LED (
D10
) to the preceding circuit using two 1-snap
wires and two 2-snap wires, as shown. The LED lights yellow when the
car is going forward, or red when it goes backward-turning.
You can replace the red/yellow LED with the color LED (
D8
), but the color
LED only lights in one car direction.
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 the battery (
B4
), switcher (
S6
) and red & black jumper wires
as shown. Use the switcher to make the mini car go forward, backward-turning, or stop.
The battery may not be able to drive this mini car for long without recharging, so connect it to a USB port to recharge it as needed (it can also be
recharged using the solar cell as shown in project 3).
Variant A: Monitor the battery voltage by setting the meter (
M6
) to the
5V
setting and place it on the ends of the red & black jumper wires that are on
the battery. Disconnect the meter when you are not using the set because the meter will gradually drain the battery.
Variant B: Instead of the meter, place the clock (
T2
) over the battery using two 1-snap wires, clock (
+
) to battery (←). See page 4 if you would like to
set the time.
Many cars on our roads are now powered using batteries and electricity instead of
gasoline. This mini car is like one of today’s electric cars, with the
B4
rechargeable
battery representing the car battery and the USB charger representing charging an
electric car battery using your house electricity or at electric car charging station.
Side view:
Top view:
PROJECT 32
• Mini Car with on-Board Control
PROJECT 33
• Mini Car with on-Board Light
Top view:
Rubber
rings
Side view: