Smooth dimming of lights in the car
Encyclopedia of radio electronics and electrical engineering /
Automobile. Electronic devices
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A smooth change in interior light can be seen so often. The proposed scheme will add a similar option to your car.
When the door is opened, the lamps will be lit at full brightness for ~0.5 sec. After closing the doors, the lamps will continue to burn for ~ 10 seconds, then smoothly for 2 seconds. go out. The lamps will go out immediately if the ignition is turned on at the moment the doors are closed, or it (the ignition) was turned on during 10 seconds. excerpts from the moment the doors are closed.
The relay is based on the PIC12F629 microcontroller. The scheme is shown in Fig.1.
Rice. 1. Scheme (click to enlarge)
When the door limit switch (R1) is closed to ground, a logical 1 will be set at the input of the GP0 microcontroller, after which a PWM signal with a smooth increase in duration will begin to form at the GP0 output. After reaching the maximum duration, a constant logic 0 will be set at the GP1 output. When the limit switch is opened (disconnected from the ground), 1 is set at the GP1 input, PWM will begin to form at the GP0 output with a smooth decrease in duration, followed by setting a constant logic 0. If, when the limit switch is opened at the input 12V is not supplied to the ignition, then a pause of 10 seconds will be held before turning off, if it is, then the lamps will go out immediately.
Divider R2 R4 serves to reduce 12V to the operating voltage of the microcontroller (5V), VD1 to protect the input of the microcontroller from accidental connection of limit switches to 12V.
Details: DD1 - PIC12F629, VT1 - IRF640 (it is excessively powerful here, you can use less powerful analogues, I just had it at hand), R1 and R3 - 510, R2 - 5.1k, R4 - 3.6k, C1 - 0.1mF , C2 - 10mF 16V, C3
- 10mF 25V, C4 and C5 - 20p, ZQ1 - 20MHz, DA1 - LM7805, VD1 - at 5.1V.
The size of the printed circuit board 23x23 (see Fig. 2) allows it to be placed in the car relay housing (see Fig. 3).
Fig.2 PCB
Fig.3. Relay
Graphs of luminosity change:
Fig.4 Graphs
Connecting the relay will most likely require some change in the standard wiring, so it will be necessary to break the direct connections of the lamps and limit switches, bring all the limit switches to one wire, and connect all the lamps to the other and connect to the relay, it is also necessary to connect the wire from the ignition switch, which is supplied with 12V after inclusions. The exception is that if your car already uses a cabin light relay-controller (without smooth extinction, of course), then it is enough to simply repeat the functionality of the standard relay outputs (if possible).
PS. In my case, after installing the relay on the car, an incorrect operation of the alarm system was revealed, when arming, she swore that the doors were open. It turned out that she perceives 5V, which are present on R1, with open limit switches as an "open door", she had to pull R1 to 12V after 10k (the free end to which the limit switches are connected).
Author: Andrey Krachkovsky; Publication: cxem.net
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