Circuit Diagrams

Cornell University EE 476 Final Project

Fertilizer Feed Rate Controller

Warren Scott


Microcontroller Board: the connections to hook up the microcontroller to all the peripheral devices.



PWM amplification Circuit: used to take the 5V low current PWM signal from the microcontroller and convert it to a 12V higher current PWM signal for controlling the heavy-duty MOSFETs that will drive the fertilizer drop motor.


Input Signal Conditioning Circuit: Takes 5 or 12V signal from shaft sensors or radar speed sensor and converts it to 5V for interfacing with the microcontroller, and provides over/under voltage protection so that the microcontroller is not damaged.



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