Abstract:

Touch screen based industrial motors/ high voltage devices control.

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 microcontroller is connected to touch screen (through UART protocol). Here we can control AC motor (high voltage device) speed through a. On the touch screen we will pre define different co ordinates for different speeds , when we press on that point on the touch screen it gives corresponding coordinate values to microcontroller. According to that values microcontroller does the action through internal C program. It is very useful for commercial and public purpose. We can control any type of devices like Relays, motors, machines and communication devices. A16x2 LCD is interfaced to the micro controller on which the status of the system can be displayed.

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.

TECHNICAL SPECIFICATIONS:

HARDWARE SPECIFICATIONS

Micro controller         :           AT89S52

Crystal                        :           11.0592 MHz

LCD                            :           HD44780

LED                            :           5mm Red LED

Motor Driver               :           TRIAC

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

ATMS

Industrials