Friday, April 1, 2011

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.
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.
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.
Due to poor isolation, there was too much noise at output, thus generating false outputs
Approach #2
We a Nokia 5Volt adapter J
Good isolation and negligible noise content


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.

RTC (Real Time Clock)

* 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.

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


                                                                 (Proteus ISIS 7)



Some of my projects...

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