1. Wireless Auto Controlled Lawn Mower
Chenlin Du, Dian Li, Gabrielle Gillespie, Yibin Wang & Yu Hu

2. Introduction Background Discussion Mechanical Design Electrical Design
Software
Conclusion
Question and Answer

3. Background

5. Before lawn mowers
By hand
Animals

6. First Lawn Mower
Edwin Budding invented the first cylinder lawn mower in 1827
Received a British patent in 1830

7. In 1868 Amariah Hill received a patent for horse drawn lawn mowers
In 1870 Elwood McGuire invented the first light weight push mower

8. In 1899 John Burr patent the first rotary blade mower
The first gas power lawn mower was invented in 1919 by Colonel Edwin George

9. Present-day

11. Our Project
Our lawn mower is apart of a new generation of lawn mowers.
Save time for the users
Reduce physical constraints
Safe for users and others around

12. Details of the project Main components Microcontroller
Motor Controller
Bluetooth Microprocessor
Ultrasonic Sensor
Motor Blade
Camera

13. Mechanical Structural
Motor Cases
Supporting Frame
Motors
Wheels

14. Supporting Frame
Anodized Aluminum
Supporting Wheels and
motors

15. Motor Case Four cases for the lawn mower Plastic
Inner Radius 0.65 inch

16. Motors It has total 3 motors 2 for back wheels 1 for blade
Specification of the motors
Rated voltage: 7.2v
Rotate speed: 9800rpm
Gearbox
4.4:1 for the blade motor(2220rpm)
75:1 for the wheel motors (130rpm)

17. Motor Blade
10 cm long
Longer cutting edge
Durable

18. Microcontroller ATmega328 Low—power CMOS 8 bit microcontroller
Execute instructions in a single clock
Control Signal Processing
Loading program from PC
Send output signal to Motor controller

19. Motor Controller
L 328P
Two Channel
Independent
Speed, Direction, Stop

20. Ultrasonic Ranging Detector
Function
180 Degree and 2-400cm
Setup to 50cm
Theory
Trig and echo pin

21. Bluetooth Microprocessor
Serial Port Module HC-05
CSR external single chip Bluetooth System
CMOS technology & Adaptive Freq Hopping Features
UART Port Analysis TX RX

22. Power supply Ni-MH rechargeable battery
Reasons for choosing Ni-MH battery
Stable DC current
1.2V voltage
High capacitance(2000mAh), no memory effect
Environmental, safety
How batteries do the power supplying
6 Battery cases
in series and parallel
7.2v voltage total

23. Software
Microcontroller
Bluetooth

24. Conclusion Reduce physical constraints on the user
Reduce time it takes to mow the lawn
This lawn mower is safe for the user and others around
Eco-friendly
Cost efficient
Lawn care services
Maintenance
Cleaning
Parts

25. Future Plans
Convert the computer application to an app allowing users remote access to lawn mower controls
Develop models to accommodate different lawn size

26. Questions????