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

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

Background

Before lawn mowers By hand Animals

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

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

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

Present-day

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

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

Mechanical Structural Motor Cases Supporting Frame Motors Wheels

Supporting Frame Anodized Aluminum Supporting Wheels and motors

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

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)

Motor Blade 10 cm long Longer cutting edge Durable

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

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

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

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

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

Software Microcontroller Bluetooth

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

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

Questions????