Block Diagram

4-Wire Touch Screen

3-D Electrical Equivalent of the TS

Screen Interface to the MCU

ITO conductive layers FPC Cable Active Area Rtouch ↓ when the TS is touched

X & Y position Measurements

Measurement X+ Excite X- Excite Y+ Excite Y- Excite

Standby Gnd Hi-Z Hi-Z Pull up / Int

X-Coordinate Gnd Vcc Hi-Z Hi-Z / ADC

Y-Coordinate Hi-Z Hi-Z / ADC Gnd Vcc

Problems Faced

Switching i/p & o/p on same lines Fluctuations in readings if done fast Need of Touch Interrupt ADC resolution 10 bit to 8 bit Noise on lifting stylus

Graphical LCD

128x64 pixels KS0108 on-chip controller Screen divided into two parts- left & right

GLCD working

Problems Faced

No ready library available Timing Simulation Reading from the GLCD Green version voltage thresholds

different from the Blue version

Background Math

2 2d a b

1tan m

Rectangular to Polar Conversion

Distance:

Angle:

a = x1 – x0b = y1 – y0m = b/a

From Transmitter:s[angle],[distance]e.g. s0030,040 s-050,020

At receiver: θ = θ2 – θ1

Rotate the vehicle by angle ‘θ’Then move forward by ‘d’ distance

θ2

θ1

θ0

Survey Send Clear

Touch ControlSurveillance Vehicle

Searching...

Device 1

Mode:

AutomappingUser guided

Welcome Screen

Search for all the devices in thevicinity of the transmitter

Select ‘Mode’:Autonomous Mapping of the region orManually guiding the vehicle

The Main Screen with active area & menu

Survey Send Clear

Draw the path to be followed(100 samples will be taken)

‘Send’ the data to the vehicle through RFand start the vehicle

‘Clear’ screen to draw another path

‘Survey’ to get the sensor data from the vehicle