Backlighting for turns

Additional lighting when turning

11 March 2012 | Author: Nick | Views: 19056 |

A large number of accidents occur due to insufficient lighting of the road at night, so modern cars have robotic headlights. How can you improve illumination of the roadside in old cars? Vladimir Arbuzov has found a solution.

In foreign cars, the problem of poor road lighting solves the system of adaptive headlights. It allows you to change the direction of the dipped beam depending on the speed and angle of the car. Of course, such adaptive headlights are not produced on VAZ 2110, so the side light of headlights is a dream? Not at all, the solution is very simple. It boils down to the installation of additional headlamps in the bumper. There are several connection schemes, but first things first:

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The simplest connection option is the diagram in Figure 1. The additional lighting of the curb will be switched on together with the turn signal. The “plus” of the turn signal light is activated via a diode by a low current relay (e.g. B5115C, coil current 20. 50 mA). Current from the backup fuse is fed to the sidelight through the switch (we turn off the sidelight during the day) and the relay contacts. To prevent the lights from blinking like a turn signal, you need to connect a 1000μF capacitor in parallel to the coil legs of the relay.

The circuit in figure 2 will turn on the curb light when you turn the steering wheel. This will be handy when you often have to go into the woods, where the turn signal lights are not used when maneuvering. The “plus” to the side lamps comes as in the first scheme, but they are commanded by reed switches. They are placed in a pencil case, mounted on the bracket in front of the steering rack mechanism. On the bolt 2 fixing the right pull rod of the steering rack through the spacer 5 (piece of thick rubber hose about 50 mm long) glued “liquid nails” powerful magnet 6. When you turn the steering wheel to the right the magnet moves along the container with the reed switches. After its passing the normally closed reed switches Gk2 and Gk3 will stay on, and the reed switch Gk-1 will close for a moment, sending a signal to the thyristor D1, which will open. The current will go to the relay and the sidelight bulb will receive power. When the rudder is reversed the sidelight will be on until the magnet opens the reed switch Gk2. Then thyristor D1 closes and the light goes out. If you turn to the left the circuit works similarly, only the reed switches Gk3 and Gk4 and thyristor D2 will come into action. Now you know that it is not necessary to have adaptive headlights in order to illuminate the road as effectively as possible when making turns at night. You can improve lateral road lighting with the help of ordinary lamps, which are installed in the side of the bumper. By the way, you can improve the road lighting in another way, such as installing bi-lenses.

Delicate illumination of turns on the PIC

A PIC12F683 based turn signal light circuit is described in this article. This circuit allows you to turn on an additional lamp (or one of the fog lights) when the car turns, thereby illuminating the turning area. The circuit takes the signal from the turn signal sensor, but not from the steering wheel sensor. On the one hand, this is even better, because the turn signal is switched on before the turn starts, so you can see possible obstacles in advance, not when the car has already started to turn.

Unlike widespread on the internet scheme with a relay and capacitor, this device turns on the headlamp smoothly, within 1.5-2 seconds, to avoid possible sharp blinding of pedestrians and drivers who are on the turn or behind it. Also the headlight turns off smoothly after the turn signal lamp is turned off. The circuit has an enable input, without voltage to which the device will not turn on the lamps. Since the turn signal light is not needed during the day, for example, if this input is connected to the dipped beam, the device will only work when the dipped beam is on.

The diagram of the device is shown in the figure:

The device is built on a PIC12F683 microcontroller. Pulses from the turn signal lamps are fed to the inputs L and R. On the input BL a voltage of 14 V is fed, allowing the operation of the device. These three circuits have overvoltage protection in the form of resistors and stabilizing diodes. Transistors Q1 and Q2 control fuse Q3, which turns on the left backlight lamp, and transistors Q4 and Q5 control fuse Q6, which turns on the right backlight lamp. When you get a pulse from the left backlight the microcontroller opens transistor Q1 and starts to send a PWM signal to transistors Q2 and Q5. But since Q4 is closed only the left light bulb starts to light up as a result. The same principle is used to turn on the right lamp. Since the hardware PWM in the controller is only one, I had to implement this circuit. The software PWM for 2 channels in these conditions works unsatisfactorily.

The diodes D5 and D6 are protective diodes, needed for damping the pulses caused by the inductance of the wires when they are very long. They can be replaced by any fast diodes for current not less than 1A.

The device is assembled on a PCB designed for GAINTA B031 case. General view of the PCB:

Bottom layer separately:

Bottom layer in PDF download

Board renderer in 3D

Photo of the assembled board:

J2 connector – terminal block type 2EDGR-5.08-08P or similar with 5.08 mm pitch under mating part with screw wire clamp. Transistors Q3 and Q5 are any P-channel MOSFETs in D2Pak package for your required current and voltage of at least 25 volts. Choke L2 is RLB1314 type or similar.

PIC12F683 or similar pin type microcontroller in DIP package (for the convenience of soldering by beginners you can put it through the panel).

Download the firmware of the delicate turning area illumination: 1. 20kHz_7bit_3sec

Download the project in proteus

Connection Features

Since the turn signal light device is needed only at night on unlit areas, it is advisable to connect the device as follows in order not to light up under other conditions (for example, standing at a traffic light with the turn signal on in the city where there are lights).

* – via relay from battery with control from low beam or low beam

It is not recommended to connect the device to the high beam, because it is not always engaged.