- USB:- DC Motor Controller using PIC18f4550 (keyboard)
Hello friends,
Requirements
A small application [C#] is controlling my pic18f4550 USB interface board with my computer, enabling me to control my board with keyboard. The output of the microcontroller is given to the input of a L293D motor driver , hence enabling me to control my DC motor in ( forward / reverse ) that is Clockwise and Counter Clockwise | anti-clock (cw/ccw) direction.If you really interested in robotics and controlling stuffs then one of the most basic thing is to control your own applications like DC Motors , Stepper Motor , Servo (with pwm) etc etc. So lets do it with kind of absolute beginner level with DC motors.
IF you are really beginner then i suggest watch all the three videos.
The USB Device project I have already done before here http://www.instructables.com/id/USB-Project-USB-Interface-Board-Using-PIC18F455/ you can download the C# application [ pic18f4550 board tutorial ] from the link.This demo board enables to use Keyboard. this l293d motor Driver is just a application of the USB Interface board.
The input voltage for the motor is coltrolled with a Linear Voltage Regulator IC 7805, For 5v input voltage to the motors.
The working of the this project is very simple
USB + C# [HID] > pic18f4550 > L293D > DC motor
Schematic for USB Motor Driver
You can find the Schematic for this USB DC motor controller in the pictures here. Its a Single DC motor interface to pic18f4550 however two two interface is possible.
WORKING OF THE L293D MOTOR Driver
ABOUT L293D
You can find the pin diagram of l293d motor driver with a short google, the chip is kind of self explanatory when you see it. With one single chip you can control two D.C motors to rotate in forward/ reverse direction on your command.
This chip understands only logic 0 and logic 1 signals as input control signal , we are going to generate the logic 0 and 1 with the help of a pic18f4550 microcontroller , the logic 0 and 1 will be fed to the input of the l293d and motor will be connected to the out pins of L293D.
I am just providing the introduction of the L293D here. Hence who already know about l293d can skip this Logic Description But if you are beginner with Understanding with logic description and working then you can read it here for a detailed information and understanding.
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