Datasheet

20
A motorized development platform
LDW
1
0
2
FR
FRONT RIGHT LIGHTS
LDY
VCC VCC
VCC
LDY
1
0
2
FL
LDW
VCC VCC
VCC
LDR
1
0
2
RR
LDY
VCC VCC
VCC
LDY
1
0
2
RL
LDR
VCC VCC
VCC
FRONT LEFT LIGHTS
REAR RIGHT LIGHTS
REAR LEFT LIGHTS
The Buggy has a dierential motor drive. The four DC motors
are split by left and right axis (controlled by DRV833RTY motor
drivers, U6 and U7, one for each side). Steering takes place when
you vary the relative rate of rotation between the left and right
side. This type of steering is simpler to manipulate if you’ll be
writing your own rmware for the Buggy. Also, when one pair
of wheels is put in reverse while the other is in normal gear, the
Buggy will start to spin, which wouldn’t be possible otherwise.
Just like a real car, the Buggy has a set
of front and rear lights for signaling and
for lighting the way. These lights are
routed in a way that makes them easier
to program should you develop your own
rmware for the Buggy. They’re grouped
in three sets based on function: (1)
The pair of white LEDs on the front are
headlights, with two modes of brightness;
(2) The red LED brake lights on the rear
also have two brightness levels; and (3)
the two pair of yellow LED signal lights
are grouped by left and right side. Pins for controling Buggy’s light
LED schematics
Highlighted above are the ve pins that
control the lights. TURN L and TURN R
regulate the signal lights. H.LAMPS turns
on the headlights and rear lights at low
intensity. Activate both the M.BEAM and
H.LAMPS at the same time for brighter
headlights. For brighter rear lights (stop
lights), activate the BRAKE and H.LAMPS
at the same time.
To prevent the motors from drawing too much current from the
battery (and in doing so prevent the other components from
functioning properly) a few resistors are placed to limit current
draw. Each motor can draw a maximum of 400 mA, for a total of
1.6 A for all four motors.
Lights Motors
HEADLAMPS
TURN_R
BRAKE
HDR2
MAIN BEAM
TURN_L
HDR1
VCC-5V
D3
PMEG3010ER
U6U7
PWM-A
and PWM-B
pins control
the left
side motors
PWM-C and
PWM-D
pins control
the right
side motors