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.
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)



 

Friday, February 11, 2011

First Run..

Today we gave it a run on petrol, with our newly designed  auto-start system. It just had the basic functionality of turning the generator on when electricity from mains cut off, and turns off the generator when electricity from the mains resumed.

Here's a rough video in the dark!
video

Our generator has arrived!!

Hi everyone, here's our generator

Its a ''Matari MG5500E'', which is a 3.5KV gasoline (Petrol) generator. Its has manual as well as self-start option for starting. The choke is not auto-controlled, so we have to use a plunger or stepper to control the choke at a later stage for its autonomous auto-start operation.

As for now, it runs on petrol only, but soon we will be installing a natural-gas kit to it so that it could run on both fuels.

Tuesday, January 4, 2011

Load Switching Mechanism

Since I will be testing our ATS system on a 3.5Kv generator, thus max ampere rating of this generator will be ~15Amperes. So I will be using 30A-heavy duty relays (like those found in a common UPS).   

I have successfully tested operation of these relays on breadboard. Now i will soon be inserting them in a veroboard for further trials, until we make a final PCB of the whole circuit near the end of my project.

Feedback Sensing Module..

I have designed and tested a sensing module on a breadboard that could inform the microcontroller that if main 220V-50Hz electricity source (i.e. from WAPDA) is available or not.
Next I designed, etched and developed a PCB and enclosed that PCB in a regular adapter casing for insulation and protection.

RTC...

After successful testing of RTC (DS-1307) on bread board, I designed, etched and constructed a PCB that had a pocket for backup cell (CR-2032 [3v] ) so that it could hold time and calender even when the power of the reset of the circuit was cut-off.

GSM Controller continued..

Step 3:
Next I programmed the microcontroller (AT89S52) to send the same sequence of 'at-commands' through serial port. I verified via 'hyperterminal' that the microcontroller was sending those at commands in exact order, with proper delay. This part was really tough. It took me and my group-mate several nights to accomplish.

Step 4:   
It was the time for us to make a cable to connect mobile directly with the microcontroller, so we made a serial male-female cable with tx-rx pins in cross.
After a lot of hardware debugging we were able to successfully communicate mobile with the microcontroller.

Welcome...

Some of my projects...

Link to my Final Year Project Report
(technical details and C++ code)

Click Here

For Line Follower Details

Click here