Week Four Technology Project

Hi every one:


I and buddihka booked a time and talked with the Vijay.

After we told the tutor Vijay, Vijay gave us some idea:


(1) using the multimeter to record the value of the voltage and current in each point, especially on the changing on the high beam and low beam.

(2) On the test I only use one bulb to check, on the vehilce the high/low beam is one pair.

(3) Preparing for the fog flash on the board, when you saw the high beam the fog need flash.

(4) The two bulb will be pallarel.

(5) record all the parts price, and calculate the labour fee for making a circuit and fixing on the vehilce.

(6) Making your own logo and putting all the part in the box.

We found a flash circut:

We will study this circuit and put the components on the board.

Hi everyone ! I and buddihka found all the parts and starts to put all the parts on the board.

There is a problem about the relay: if the relay is five pin. then which pin is which. 30,85,86,87,87A we looked the website: 85 and 86 is for the coil. 30 is for the positive 12V in 87A and 87 one is for the low beam, one is for the high beam.

Relay Diagram Bottom View after all the parts put on the board and connect to the power supplier and the relay. it's working. We use brake/park light for the low/high beam. using the hand block the LDR the relay switched the low beam to the high beam. removed the hand, the light switch from the high beam to the low beam.

The diagram on the website is right. we will talk with our tutor Vijay


Week three for the Technology Project.

Hi everyone ! I and buddihka found all the parts and starts to put all the parts on the board. There is a problem about the relay: if the relay is five pin. then which pin is which. 30,85,86,87,87A we looked the website: 85 and 86 is for the coil. 30 is for the positive 12V in 87A and 87 one is for the low beam, one is for the high beam. Relay Diagram Bottom View after all the parts put on the board and connect to the power supplier and the relay. it's working. We use brake/park light for the low/high beam. using the hand block the LDR the relay switched the low beam to the high beam. removed the hand, the light switch from the high beam to the low beam. The diagram on the website is right. Week three for the Technology Project.

Hi everyone:

I and buddhika has a project for the auo dimmer light and warning system.

we found the a small circuit on the website, it's auto dimmer light circuit, our project is different to that, but we would like to know the theroy and then make our one.

That circuit showing at the first week:

But we did not know the circuit is working or not, so we just is trying to make one for the test.

The componet for the circuit:

R1 = 1K,
P1 = 10 K,
LDR = ( We bought the LDR in the Jaycar )
T1 = BC547,
D1 = 1N4007
Relay = coil 400 Ohms, DPDT, 12 volts

LDR in that circuit is 10-50K

we can not find the exactly same one:

Light Dependent Resistor (LDR) - 8.5 x 10.1mm CAT. NO. RD3485
Dark resistance: 0.5M ohm min.
Light resistance: 2.8K ohm min 8.4K ohm max.

The Jaycar supply another kind of the LDR: light resistance is 48K to 180K.

so we use the RD 3485:

One of thing confuse us is the relay:

From the diagram we can they use the Eight pin relay, six for the two lights high beam and low beam switch, we though just using a five pin relay to be a test.

We thought we can the two lights parallel together, and use one brake/park light to be the high beam and low beam.

High beam:  brake light

Low beam:  park light

The week two for the technology Project.

Hi every one:


I and buddhika found some informations about the Auto dimmer headlight circuit

This is a simple circuit, using a LDR to be a sensor, LDR light dependent resistance,
This type resistance has such function:

When in the dark the resistance is increasing.

When under the light the resistance is reducing.

The LDR is used  together with the transistor, and the LDR is connect to the base, the LDR is sensor to send the current to the transistor, and let the transistor to be a switch,
When in the circuit the senor and transistor is used for the switch to control the electrical unit liking the bulb, they uses the relay to be a control.

Light changing----LDR----current----transistor base----transistor on----relay switch----bulb high beam and low beam switch.


The diode I think is a protection for the relay coil.

That is our understanding for this circuit.

Week one for the blogger Technology Projector

Sensor A

Sensor A: It’s a type of sensor which can sensor the high beam light, and can sort out: street light, low beam light, high beam light, light from the house.

Sensor B: it’s a type of radar which can senor the vehicle from the facing way.

(1)  The first week for the Research for right now market design:

I and the Buwdhika looked through the smart / intelligence light in the Market and finding two system.

(1) Smart head light system

(2) Intelligent headlight control

Smart head light system

The Benz launched the smart light system on the 2009 and did some updated recently.

In the 2009 the Benz put the smart head light system into the luxury vehicles.

This system is designed for reducing the traffic accident at the night, to prevent the accident for the pedestrians and vehicle. The pedestrian is main point to develop the system.

The main equipment:

1 infra-red light projectors

2 spot light function

(2) Intelligent headlight control

The system can control the headlight to switch from high beam to low beam.

The main idea is to increase the road safety by sensing the headlight head light, tail light, taillight and street light.

The main equipment:

(1) Camera

The working steps From those two designs above the camera is the main point:

However the Benz told us they used the infra-red night vision camera, the second design they did not say which kind of design.

We will do some research about the camera(sensor) in the next week.

Because in our system we need some sensor to detect the high beam, low beam, street light, tail light, using what kind of sensor is important part of this project.