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Study On Pesticide Spraying Control System By Adjusting PWM Value

Posted on:2012-12-10Degree:MasterType:Thesis
Country:ChinaCandidate:D Y LiuFull Text:PDF
GTID:2178330332991277Subject:Circuits and Systems
Abstract/Summary:PDF Full Text Request
In these days, the precision agriculture comes to agenda generally as the continuously progress of agricultural technology. However, most agriculture production including dusting of agricultural chemicals are still under manual operation, and the amount to spread is also confirmed accordingly to human's experience. Hence, this slows down the working efficiency and causes pollution to air and soil; what's more, it brings safe quality problems to agricultural products.In order to reduce the pollution and achieve Variable spraying, this thesis developed a set of controlling system of variable spraying of agricultural chemicals based on PWM. This system can adjust the amount of chemical automatically according to the speed and pressure of the farm tractors, thus we can make the crops can be injected uniformly, and there will be no redundant chemical left in the process. This paper made detailed introduction of the design of the controlling system by the following aspects:Current national development status and main proposed issues in agricultural field was analyzed, and the importance of developing a variable spraying system is discussed then.The work principle and main component of this system were introduced.Finish the selection of hardware parts. The system includes the following modules:ATMEGA12 which is the main processing chip, power module,4*4 keyboard input module, PWM signal amplified driver module, LCD liquid crystal display module, system pressure sensor module, ultrasonic sensor module, speed sensor module and serial communication module.Determine the functional of the nozzle flow which is about pressure, solenoid valve frequency and PWM value. Then the function was written into the microcontroller in the form of program, completing microcontroller software design.Put the PWM variable pesticide spraying control system on the pesticide spraying machine, conducted field tests of pesticide spraying, obtain the test data and analysis them.
Keywords/Search Tags:variable spraying, PWM, uniform spraying, sensor
PDF Full Text Request
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