Abstract:

Robot control using Touch Screen.

         This project uses a resistive touch screen interfaced with a controller which decodes the coordinates and output serial data at 9600 bps. The data can be fed to the controller or PC for further process. This resistive touch screen can be used with a stylus or fingertip and is easy to use with a microcontroller. You can put it over a paper overlay for a touch control panel or attach it to an LCD to DIY a touch-activated display. We can control any device by pressing on the screen. It eliminates normal hard keys. Compared to hard keys, touch screens are more reliable.

                 In this project, a robot can be controlled by touch screen with wired communication. Touch Screen connected to the microcontroller serially. The two motors are connected to microcontroller with H-Bridge driver. H-Bridge controls two motors in in both clock and anti clock direction to move the ROBO in different directions.  L293D is the H-Bridge used in our project. By touching on the touch screen at different places it generates different x, y coordinates, accordingly the microcontroller controls two motors in required direction. We can add R.F wireless communication to this project so that the project for ease of operation from a remote area and making the making near to the real time application. Here we use 8051 as a microcontroller with 5v DC Power supply. Serial (UART) protocol is primary concern here. The heart of this project is Touch Screen Modem which works on serial (UART) protocol. Touch screen gives three coordinates like x, y and z. Here x, y are coordinates and z is pressure value. 16X2 LCD display is connected to microcontroller through digital I/O pins.. H-Bridge (L293D) is used to drive the motors

in clockwise and counter clock wise directions.  We use 60/100 r. p. m DC gear motors  to move robot in different directions.

 

TECHNICAL SPECIFICATIONS:

HARDWARE SPECIFICATIONS

Micro controller         :           AT89S52

Crystal                        :           11.0592 MHz

LED                            :           5mm Red LED

H – Bridge                  :           L293D

DC Gear Motor           :           60/100 r. p. m

Touch Screen Modem

Basic GPIOs

POWER SUPPLY

Transformer                :           12V step down 

Filter                           :           1000uf/25V

Voltage Regulator      :           7805 / 7812

SOFTWARE SPECIFICATIONS

Software tools used

Keil IDE

Proteus VSM

UC flash

APPLICATIONS

Robotics

Industrial automation