paź 042015

I still have an annoying analog entry phone in my flat. It does not have the numeric keypad to type the passcode and enter the staircase. I am too lazy to open the block door with a key every time I come back home, but this can be solved easily. Of course I did not mean the replacement of the entry phone with a new, digital one – that would be too easy and too obvious. Here’s my quick weekend project – analog entry phone hack, which opens the door after ringing in the secret passcode consisting of short and long rings. Traditionally, I have added some useless functionality like PCM audio playback from the SD card to make it more fun. It can play some samples, e.g. from retro games, an Arnie movie quote or… a barking dog when the guest or postman calls.

The circuit is installed in the handset. It detects the call signal and simulates the button press with a relay switch if signal matches the programmed pattern. It is also connected to the microphone output and can play the audio files on guest call or passcode input. I have built this circuit in an hour using components I had around – ATMega328P microcontroller, universal soldering board, relay, 3,3V LDO regulator and some passives.

You can download the source code and schematic below. The whole project was made in a couple of hours, so the sources looks a little messy. The circuit does not provide proper isolation from the entry phone circuit, so if you are going to built it yourself, you might want to add some optoisolators.

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  54 komentarze to “Open, Sesame – entry phone hack”

  1. Very interesting project. If only I would have more time…

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  4. Is it possible to integrate this with a esp8266 chip for also remote control of the door? With mqtt and home assistant

  5. Going to build this for sure

  6. Hi i m not an expert could you build one module for me with correct isolation ? Ready To pay

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  28. would this be portable to a raspberry`?

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  34. Słuchajcie jak zrobić optoizolacje idącą na mikrofon? Dałem rezystor 1k od mikrokontrolera do PC817 i na linii mikrofonu 2.4k do kolektora i jest trochę cicho. Jak to mógłbym jeszcze inaczej rozwiązać?

  35. […] Hackaday fomos encontrar um curioso uso para os conhecimentos eletrónicos. O SileNT criou uma campainha de porta que abre consoante um toque secreto. Isto não é novidade. Quando éramos novos, para não andarmos com a chave do prédio, 3 toques […]

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  37. Można by było to po Polsku wystawić? Czasami ciężko w ang jest się w 100% połapać.
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  38. Projekt na 5 za lifehack! Sam kiedyś myślałem o otwieraniu domofonu szyfrem, ale nie wpadłem na pomysł podawania dźwięków na zewnątrz, dla mnie Mistrz!

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  39. A bit off-the-wall, but where did you find the remix of the Imperial March? Who does it and what is it from?

  40. […] nobody is home, you’re out of luck. That’s why [Paweł] spent an hour whipping up an intercom connected automation system pack full of […]

  41. Na serwis typu „kikstarter” jak znalazł. Taka luźna myśl. Pozdrawiam i gratuluję pomysłu.

  42. jestem również gotowy kupić to cudo – proszę o zrobienie takiego gotowego cacka!

  43. Fascynujące!! też jestem gotów zapłacić za taki umilacz domofonu, czy wgl jest to możliwe?

  44. Super sprawa, gdyby to było w sprzedaży to pewnie zarobiłby Pan niezłą kasę. Na układach scalonych to ni cholery się nie znam i zawsze mnie to przerażało, dlatego z chęcią kupiłbym coś takiego. Rewelacja, bo mam już dość „Reklamy!”, „Mógłby pan otworzyć, bo zapomniałem kluczy?” itp. No bomba!

  45. Czy jest możliwość zakupu u Pana urządzenia tego typu?


  46. Hi m8, really nice job. On my family home place I have similar one door phone. Here where I live (Wroclaw PL) On each step I’m facing the digital ones. Also annoying is when you forget your keys and nobody is present at home at the moment. Thanks for yploading the project. I try to do similar one device on my own of course only for my purposes.

    PS don’t sell this amazing thing 🙂

  47. Witam serdecznie.
    Dołączam się do pytania o możliwość zakupu gotowego modułu.

  48. Również bym się pisał na takie urządzenie, czekam na informacje.

  49. brakuje tylko „i can do this alll dayyy” 😀

  50. Witam.
    Czy jest możliwość zakupu podobnego cudeńka?

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