Uctronics WIFI Smart Robot Car Kit User manual

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Table of Contents
1. Introduction......................................................................................................................................................4
1.1 The UNO R3 board for Arduino.....................................................................................................5
1.1.1 Specification............................................................................................................................. 5
1.1.2 Functions of UNO Board ..................................................................................................... 6
1.2 Function of Each Module .................................................................................................................6
2. Function Module Introduction ...................................................................................................................6
2.1 HC-SR04 Ultrasonic Sensor Module.............................................................................................6
2.1.1 Working Principle................................................................................................................... 7
2.1.2 Specification............................................................................................................................. 8
2.1.3 Wiring diagram:...................................................................................................................... 8
2.2 L293D Motor Drive Expansion Board...........................................................................................8
2.2.1 Specification............................................................................................................................. 9
2.3 SG90 9g micro servo motor and Pan/Tilt/Zoom......................................................................9
2.3.1 Specification...........................................................................................................................10
2.4 4WD Driver Motor Robot Smart Car Chassis Kits ................................................................. 10
2.4.1 Contents..................................................................................................................................11
2.5 Line Tracking Module ..................................................................................................................... 11
2.5.1 Working Principle.................................................................................................................11
2.5.2 Specification...........................................................................................................................11
2.6 WIFI Module Kit ................................................................................................................................ 12
2.6.1 Specification:..........................................................................................................................12
2.7 Camera ................................................................................................................................................ 13
2.7.1 Specification:..........................................................................................................................13
3. Pin Definition................................................................................................................................................. 14
4. Wiring .............................................................................................................................................................. 15
5. Installation...................................................................................................................................................... 16
5.1 Installation of the Car ..................................................................................................................... 17
5.2 Wire Connection............................................................................................................................... 34

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6. Start Programing.......................................................................................................................................... 41
6.1 Install Arduino IDE ........................................................................................................................... 41
6.2 Add Libraries...................................................................................................................................... 45
7. RobotCar App for Android....................................................................................................................... 49
7.1 Download and Install App............................................................................................................. 49
7.2 Connect to the Robot Car............................................................................................................. 49
7.3 Function introduction ..................................................................................................................... 50

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1. Introduction
The UCTRONICS WIFI Smart Robot Car Kit is a flexible vehicular kit particularly designed for
education, competition and entertainment. With it, you can implement diverse interesting
ideas, such as WIFI remote control, automatic avoidance of obstacles, line inspection, take
pictures and record videos, etc. What’s more, in the manual mode, it has first person view
(FPV).
A robot is a machine that can perform some tasks automatically or with guidance. Robotics is
generally a combination of computational intelligence and physical machines (motors). Due
to their high level of performance and reliability, the robot gets the splendid popularity in
our daily life.
Come on! let’s go into a Robot World!

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Each part of the car is as below:
1.1 The UNO R3 board for Arduino
The UNO is the best board to get started with electronics and coding. If this is your first
experience tinkering with the platform, the UNO is the most robust board you can start
playing with. The UNO is the most used and documented board of the whole Arduino family.
1.1.1 Specification

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Microcontroller: ATmega328P
Input voltage (recommended): 7V-12V
Operating voltage: 5V
Digital I/O Pins: 14 (of which 6 provide PWM output)
Analog input Pins: 6
DC current per I/O Pin: 40 mA
SRAM: 2 KB (ATmega328)
DC current for 3.3V Pin: 50 mA
Clock speed: 16 MHz
Flash memory: 32 KB (ATmega328P) of which 0.5 KB
used by bootloader
1.1.2 Functions of UNO Board
Connect with L293D motor drive board, control the movement of the car
Connect with ultrasonic module, achieve obstacle avoidance function
Connect with camera and PTZ, control the movement of PTZ
Connect with wifi module, remote control the car
Connect with the tracking module, realize the function of line tracking
Click the following link, you can find in the Getting Started section all the information you
need to configure your board, use the Arduino Software (IDE), and start tinker with coding
and electronics.
https://www.arduino.cc/en/Guide/HomePage
1.2 Function of Each Module
L293D expansion board with a switch: drive the motor to rotate
Ultrasonic sensor module: distance measurement and obstacle avoidance
Line tracking module: black and white sensor for recognition of the white and black
lanes
Wifi module: provide the Wifi remote control function
Chassis kit: the frame of the car and drive the car to move
Servo and Pan/Tilt/Zoom: enable the camera to rotate
5MP camera module: take a picture or record a video
2. Function Module Introduction
2.1 HC-SR04 Ultrasonic Sensor Module

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The HC-SR04 ultrasonic sensor module for Arduino is used for obstacle detection. Ultrasonic
sensor transmits the ultrasonic waves from its sensor head and again receives the ultrasonic
waves reflected from an object.
Ultrasonic sensor general diagram
2.1.1 Working Principle
The ultrasonic sensor emits the short and high frequency signal. These propagate in the air
at the velocity of sound. If they hit any object, then they reflect back echo signal to the
sensor. The ultrasonic sensor consists of a multi vibrator, fixed to the base. The multi vibrator
is combination of a resonator and vibrator. The resonator delivers ultrasonic wave generated
by the vibration. The ultrasonic sensor actually consists of two parts; the emitter which
produces a 40 kHz sound wave and the detector detects 40 kHz sound wave and sends
electrical signal back to the microcontroller.
Ultrasonic working principle
The ultrasonic sensor enables the robot to virtually see and recognize object, measure
distance and avoid obstacles. The operating range of ultrasonic sensor is 2 cm to 450 cm.

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2.1.2 Specification
Working voltage: 5V DC
Output signal: Electric frequency signal
Static current: < 2mA
Output voltage: 0V（no obstacle）,5V(obstacle in range)
Sensor angle: <= 15°
Echo signal: output TTL PWL signal
High precision: Up to 0.3cm
Input trigger signal: 10us TTL impulse
Detection distance: 2-450cm
Mode of connection: VCC, trig (T), echo, GND
2.1.3 Wiring diagram:
HC-SR04 Ultrasonic Sensor Module
UNO
VCC
5V
Trig
A2
Echo
A3
GND
GND
2.2 L293D Motor Drive Expansion Board

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This is a commonly used DC motor drive module, using L293D chip with small current DC
motor driver. The pins are made compatible with Arduino which is easy to use.
2.2.1 Specification
2 connections for 5V servos connected to the Arduino's high-resolution dedicated timer
Up to 4 bi-directional DC motors with 4 PWM speed regulation
Up to 2 stepper motor control, single / double step control, staggered or microstepping
and rotation angle control
Ultrasonic interface, tracking module interface
The buzzer is already soldered in the L293D motor drive board
4 H-Bridges: L293D chipset provides 0.6A per bridge (1.2A peak) with thermal
shutdown protection, 4.5V to 36V
Pull down resistors to keep motors in the state of rest during power-up
All module interfaces have been modified with XH2.54 ports as to make it much easier
and convenient to assemble the car
With power button
2.3 SG90 9g micro servo motor and Pan/Tilt/Zoom
SG90 9g micro small servo motor is the main source of controlling action of the
remote-control model. The module is widely applied in the field of fixed wing, helicopter,
gliding, small robot, manipulator model.
PTZ (Pan/Tilt/Zoom) is a set of equipment used to install and fix the camera module. One set
of PTZ contains a PTZ base, 3 pieces PTZ brackets and several accessory screws. Support full
rotation.

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2.3.1 Specification
Size: 23x12.2x29 mm
Torsional moment: 1.5kg/cm
Working voltage: 4.2V-6V
Temperature range: 0℃-55℃
Operating speed: 0.1 seconds /60°
Dead band width: 10 microseconds
The maximum rotation angles of left and right are around the same.
2.4 4WD Driver Motor Robot Smart Car Chassis Kits
With the car platform, adding micro-controller (such as Arduino) and sensor modules, then
program it, a robot car comes up.
All the module interfaces have been modified with XH2.54 ports as to make it much easier
and convenient to assemble the car.

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2.4.1 Contents
4pcs Wheels
4pcs Geared Motors (1:48)
8pcs T-type Fastener
1pcs 18650 Battery Container
1pcs Acrylic Car Chassis
Screws+ Nuts
2.5 Line Tracking Module
The line tracking module detects lines in the surrounding environment, and transfers the
data to the processor. The processor analyzes the data, and sends a command to control the
movement of the wheels.
2.5.1 Working Principle
The TCRT5000 IR sensor on the line follower has a TX and RX inside. If a bright color surface
is detected in front of the sensor, such as a white paper (about 1cm away), most of the IR
rays will be reflected; if a dark color like black surface is detected, most of the rays will be
absorbed, while only a small amount will be reflected. The RX will output different analog
signals according to the intensity of the reflected IR light.
2.5.2 Specification
Working voltage: DC 5V
Detecting range: 1~20mm
Working temperature: 0°C ~ + 50°C
Detector type: phototransistor
Emitter wavelength: 950 nm
PCB dimension: 20mm×54mm
3 output channel
Output level: TTL level (black line of low
effective, high efficient white line)

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2.6 WIFI Module Kit
The wifi module kit includes two parts, one is the core board, and the other is the wifi
adapter board. It is used to send control command to the car and transmits the real-time
camera image to the smart phone.
2.6.1 Specification:
The wifi core board:
Support OS: Openwrt (linux)
Working voltage: 3.3V ± 10%
Average power consumption: 0.45W
Working temperature: -10~70℃
Wireless speed: maximum is 150Mbps
RF power: maximum is 18dbm
System frequency: 400MHz
RAM: 64MByte DDR2 RAM
Wireless transmission distance: 80-100m
Wireless working mode: Routing, AP, Relay, Bridging
Item dimension: 39mm X 23mm
The wifi adapter board:
Support USB camera interface
With system startup light

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With wifi antenna
Item dimension: 46mm X 44mm
2.7 Camera
You can take a picture or record a video through the camera stuck in the Pan/Tilt/Zoom and
connected with two 9g micro servo motor, thus giving better shooting experience when
you're using it on the smart car kit.
2.7.1 Specification:
5 megapixels image sensor OV5640
Support for JPEG output format
Interface: usb2.0
Item size: 28mm X 28mm

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3. Pin Definition
Arduino UNO R3 Board
L293D Motor Drive Expansion Board

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4. Wiring

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5. Installation
A pre-introduction of the servo installation: 90°
For the bottom servo, you should calibrate to the center position manually. The servo
can turn 180 degrees, you shoud set it to center position so that you can turn left 90
degrees and turn right 90 degrees. Below middle picture shows the center position.
For the above servo , you shoud set the center position in order that you can turn up 90
degrees and turn down 90 degrees. Below middle picture shows the center position.
Left 90°
Center
Right 90°
Up 90°
Center
Down 90°

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5.1 Installation of the Car
Step 1: Install the deceleration DC motor

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Step 2: Fix the wheel

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Step 3: Install the UNO board

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Step 4: Install the L293D motor drive board