Abstract
With the development of the times, more and more the number of moter vehicles,driving
force is due to the combustion of gasoline and gasoline, direct emissions of carbon dioxide
and other harmful gases into the air, causing air pollution is becoming more and more serious,
the air we breathe in the poisonous. In order to reduce the emission of toxic gases and made
our air a little fresh, especially in case of need not, people use to reduce motor vehicle.The
bicycle has become an essential tool for people to travel the riding instead of walking tool.
The use of a bicycle no toxic gases, will not cause pollution to the air, on the other hand,
riding a bike can also play the role of physical exercise. The bicycle speedometer real-time
display of system design is particularly important.
The speed of the bicycle mileage display system designed can accurately reflect the
time you ride on the speed and mileage. The speed of the bicycle mileage display system
based on single-chip microcomputer as the core, adopts the non-contact speed non-contact
sensor side Holz, where in the sensor to receive the information displayed on the LCD1602
LCD1602 liquid crystal display speed of up link,down link mileage display.The motor speed
is adjustable, because the connection of sliding rheostat motor circuit, through the barrier of
mobile sliding rheostat resistance to change the size of the circuit, can change the current in
the circuit, the voltage to change the motor at both ends. The speed of the moter with
voltage changes, the speed will change.
The design of the C language program is compiled in keil software, keil software
provides the environment compile and debug on the C language. Compile C language is very
helpful to us. On the keil software, a good grasp of C language be of great advantage to us.
The design of the hardware part is composed of a single chip, circuit board, LCD display
Holzer sensor etc.. Of these elements need to have a good knowledge of welding,welding to
us through this welding technology has a good exercise. We are the components of the
welding of a certain understanding. Are very helpful to our future study and work.
Key word: single chip microcomputer; sensor; resistance; LCD display.
