Adapter for a two-channel light cord on a microcontroller. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Adapter for a two-channel light cord on a microcontroller. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Microcontrollers

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The ON button turns on the adapter, and the OFF button, respectively, turns it off. Hold the ON button until the POWER indicator lights up for about three seconds, at which time a reset is performed for a stable start (capacity 4.7x10v is being charged). If you press and hold the S1 button before turning on the power, the MAX indicator will light up. The glow of this indicator indicates that the bulbs are 20% dimmer. This mode is designed to increase the life of the bulbs. The current state is stored in non-volatile memory and is retained at subsequent power-ups. To disable this mode, hold the S1 button again when turning on the power.

Fig.1. Diagram of a dual-channel power cord adapter (click to enlarge)

The glow of the COMPARE indicator indicates that the comparator is on and if the voltage in the 240 V network is exceeded, the entire adapter will be forced to turn off. To turn off the comparator, you must hold down the S2 button before turning on the power. The state of the comparator is not remembered, each time the comparator is turned on again automatically, to turn it off, you will have to repeat the above steps. Pressing the S1 button changes the speed of the current effect. The change in speed occurs cyclically, each new press leads to a decrease in speed, and when the minimum speed is reached, the highest speed is switched on again.

The current speed state is adjusted and remembered independently for each effect. The next time you turn on the adapter, the last speed setting for each effect is restored. Pressing the S2 button selects the current effect. Every sixth press will light the AUTO indicator, the glow of this indicator indicates that all effects are performed in automatic mode one after another. Each effect is repeated 100 times. The program currently includes five effects. Each effect is carefully selected and thought out. In all effects, there is no complete extinguishing of the bulbs, so there is no unpleasant blinking. Each of the five effects has an overflow function. Of course, the use of only two channels does not make it possible to implement a "traveling wave", and yet everything looks very nice.

Operating modes switched by button S2:

0 - automatic
1 - the first channel smoothly goes out, and the second one slowly flares up (and vice versa)
2 - wink
3 - smoothly flares up and abruptly goes out (in turn)
4 - smoothly go out and sharply flare up (in turn)
5 - one channel burns constantly, and the second sharply flares up and smoothly goes out.

You can download the following files related to the project:

flash_light.hex - microcontroller firmware file
flash_light.obj - program object file
flash_light.asm - control program source
Download files

Author: Konovalov V.A., odorant@mail.ru; Publication: cxem.net

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