Doorbell "Patriot". Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Free library / Schemes of radio-electronic and electrical devices

Doorbell Patriot. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Calls and audio simulators

Comments on the article

Another hypermegadevice on a microcontroller.

Here is the diagram:

Doorbell Patriot. doorbell circuit

Nothing complicated at all. Any speaker with resistance from 4 ohms to infinity can be connected to the output of this circuit. In principle, you can simply turn on a high-impedance speaker (more than 15 kOhm) between the 1th leg of the microcircuit and the ground - and listen calmly.

And here is the source code of the controller program: patriot.asm

We look at the text of the program. We are looking for a large array in it, which is called HymnUSSR. This array contains the music of the Anthem of the USSR aka Russia. After the firmware, it will immediately begin to delight your hearing.

How? Doesn't he make you happy? Well, please - you can easily write your own melody. This is very easy to do.

Immediately after the array are the notes and their corresponding numbers. The first line corresponds to the middle octave, the 2nd line corresponds to the large octave, the 3rd line corresponds to the first.

In addition, durations are indicated by numbers in the array. That is, two numbers go to record each note. The first is the note code, the second is the duration (in conventional units). Experiment with it.

There are still pauses. A pause has the code 254. It is also written in conjunction with a duration.

The number 255 must be at the end of the melody, otherwise the program will continue to read memory outside the array and, as a result, it will happily crash :(

Also, remember that each row of the array must contain even the number of values, otherwise there will also be a glitch-s.

Perspectives.

How can this be upgraded?

You can add a melody selection module (if there are several). You can choose melodies either by sequential enumeration, or by entering a number from the keyboard, or in some other way. In addition, if you make a doorbell out of this, you can write a module for recognizing the "style" of pressing a button (such as Morse code), and in accordance with this, turn on a certain melody.

Yes, in general - a lot of things are possible ... There would be a fantasy.

Finally, I want to ask: if you write music for this device or somehow upgrade it, please share it with us. Don't be greedy. Am I not thirsty? :)

Upd. Our colleague with a nickname Masya13 sent us a couple of tunes that you can download here and more here.

Publication: radiokot.ru

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