Components required:

$,1$ LCD $16212C$

$[$for display$]$

$($Select the Type after inserting I$2$C LCD in simulation: PCF$8574-$based$)$

$1$ Ultrasonic distance sensor HC$-$SR$04[$for detection of Object distance$]$

$1$ RGB LED $[$for Light indication of Gas Hazard$]$

$3,470$ Ohm resistors

$[$for Light indication of Gas Hazard$]$

$3,470$ Ohm

$[$for RGB LED pins$]$

$1$ L$293$D IC

$[$for Motor driving$]$

$1$ DC Motor

$[$for Movement$]$

$1$ Slide switch

$[$for switching ON$/$OFF the system$]$

$1$ Arduino UNO board

$[$board for controlling$]$

Schematic diaaram:

Functionality of System

$($write Program according to this$)$:

If Slide switch is Low then DC Motor should stop, RGB LED should be Off and Ultrasonic should not be active. Display on first row of LCD "Rest".

If slide switch is HIGH then:

a$.$ Input and calculate the distance of Object from ultrasonic sensor in CM$.$

b$.$ If distance is more than $100cm$ then:

i$.$ Rotate motor in clockwise direction.

ii$.$ Switch on the RGB led in green color.

iii. Display on the first row of LCD "Away".

iv$.$ Display on $2^{nd}$ row the value of distance in $cm.$

c$.$ Else If distance is more than $50cm$ the:

i$.$ Rotate motor in Counter clockwise direction.

ii$.$ Switch on the RGB led in Blue color.

iii. Display on the first row of LCD "Near".

iv$.$ Display on $2^{nd}$ row the value of distance in $cm.$

d$.$ Else:

i$.$ Stop the motor movement.

ii$.$ Display on the first row of LCD "Stop".

iii. Toggle the RGB led colors from red to blue to green with a delay of $300ms.$