Initial Testing PCB

Schematic of Circuit Board
For Temporary Testing of GSM Communicator and Scheduler

 PCB Layout

 Developed PCB

Ignition Sequence

OFF State
            Pins Short :  2~3

ON State

Pins Short:  1~4

Self Start

Pins Short:  1~4~5

Ignition Sequence Control Unit

 

Auto Choke Adjustment

Approach 1

Choke was pulled to one side by an elastic and to the other side by a motor; which could be controlled.

Problem

There was too much stress on the choke lever

 

Approach 2

Choke was couples on a CHAIN, which moved by a motor.

We installed two limit switches to confine the movement of chain within certain limits, to prevent any damage to choke lever.

Benefit

Choke could be stopped at any position without any excess stress. 

 

 Motor Control Unit

Generator Feedback Sensing Module

Will give a HIGH LOGIC signal whenever the Generator is on and vice versa.

Approach #1

Created a feedback module ourselves which gave +7Volts output upon 220volt / 50Hz input.

Problem

Due to poor isolation, there was too much noise at output, thus generating false outputs

 

Approach #2

We a Nokia 5Volt adapter J

Benefit

Good isolation and negligible noise content

Scheduler

ON Timer

Will turn On computer daily at specified time

OFF Timer

Will turn Off computer daily at specified time

Mobil Oil Countdown Timer 

Will monitor Running Hours of generator and will notify when time reduces to zero.

Simulation 

RTC (Real Time Clock)

 

RTC-DS1307

* Maintains time and calendar

*   Equipped with a pocket for backup cell (CR-2032) so that it could hold time and calendar for up-to 10 years even when the power of the reset of the circuit is cut-off.

 Simulation

 

GSM Features

Turn ON Generator *

Will turn On generator upon reception of this message

Message Syntax “ gnon ”

Turn OFF Generator *

Will turn Off generator upon reception of this message

Message Syntax “ gnoff ”

Generator Status Check *

Will reply the message with the current status of generator

Message Syntax “ status ”

Failure Message

Notification if generator does not start after several tries

Turning On Notification

Will send message to administrator whenever the generator turns On

Turning Off Notification

Will send message to administrator whenever the generator turns OFF

 

Development Sequence of GSM Communications

 

SMS Receiving Prototype

SMS Sending Prototype

Simulation

 

                                                                 (Proteus ISIS 7)