WEEK TEN

Purchasing component:


we purchasing some component for the test board.

The parts supplier is jaycar. the total price is around 33 NZD.

week night

multisim drawing for the fog light and high low beam is done.

however the picture for the Multisim is hard to put on the blogger,

so we just took a photo by the camera and than transfer the picture from the camrea

to the computer.

By the Multisim did not have the LDR light independent resistor, so we just used a

variable resistor to instead of it.

and later we turn on the light on the multisim the system is working.

Eight week technology project

Hi every one:

I and buddhika manufactured Board A auto switch high low beam and the Board B.

so the next steps:
(1) Redesign the circuit.

(2) Zipping the board A and board B together.

(3) welding the parts on the board

(4) Testing on the lab

To archieve this:

Our tutor Vijay gave some suggestions to us.


We need download the software multisim, designing on the computer.

Week seven technology project

Hi every one!


I and buddhika found the problem: the relay and bulb. we used a relay and small transistor BC 547, the circuit is working, that is good:

(1) To control the 12V21W bulb is better using the relay (four pins)

(2) We can still using the transistor, the BC 547 is used for the control the relay coils.

(3) The BC 547  base pin received the signal from the 555 ciruit, ( digital type ).

(4) The emitter connects to the ground.

(5) The collector connects to the coil.

(6) The coil first connects to the power supply, let current flow through the coil and then go to the collector.

(7) relay 30 connect to the power, and 87 connect to the bulb.

we made a mistake on the the transistor pins, and we mixture the emitter to the collector. so the circuit is not working, unless the relay is dida----dida, and increasing the voltage to 10.5 volt, the bulb turned on. later we diaganostic the problem, the transistor pin is a problem.

Week six technology project

Hi every one:



I and buddhika found the circuit problem was on the part (transistor and bulb).



The design using the transistor to be switch for the bulb is quite hard, because the high current and voltage, later we talked with the tutor about it. we can us a relay to control for the bulb, and the a small relay for the switch for the relay.

That is a new design, but we need to do it by the test.

Week five for the technology project

Hi every one

I and buddhika will do a circuit for the intellegent head light, it has two function:

One is for the auto switch the high beam to low beam.

Two is for the fog light flash to warn the the facing vehicle which is turning on the high beam.

The circuit on the function two is not working:

I and buddhika tried to find one way to test, we thought the oscilloscope maybe can do the job:

The 555 circuit is working, now only the transistor and the bulb ciruit is the problem.

Hi everyone:

I and buddika made a ciruit for the fog light flash: we tried typeA and TypeB:
Type A:

Type B:

The type A is not working and the type B is still not work, so we tried to find where is the problem. we did not have too many time, so we focus on the type B, because we thought the type B is more suitable for the circuit.

The type B include two parts:

One the signal send:

One is the transistor and bulb:

we test the transistor and bulb, not working. and we thought how to test the signal 555.