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Physical talking clock — Parallax Forums

Physical talking clock

larriouslarrious Posts: 2
in Customer Projects

I'm looking for a suitable microcontroller for the below specs. Considering the propeller 1 or some arduino board (which i'll probably need someone to help make sense of). Any advice welcome!

The use case is for visually impaired - they'll press a button and it'll announce the time (in mandarin).
I'll be likely re-writing the audio file, as well as the programming, so no hard soldering of the sd card, or the use of ROM I presume. It doesn't need a UI or dashboard or any other alarm features.

Specs

  • speaker
  • sd card - for storing .wav files (audacity, 1 file and chop up for consistent volume)
  • sd card slot - solder on or buy a board with it.
  • buton
  • microcontroller to listen to button input
  • clock - [DS3231 RTC]
  • battery box
  • 3v battery
    *EEPROM

Comments

  • evanhevanh Posts: 15,905

    One nice thing with using the Propeller is it will be relatively easy to set it up to load next individual spoken word while the previous word is being output to the speaker. That way less time is required to piece it together. Or able to use higher quality samples in limited RAM.

  • larriouslarrious Posts: 2

    Thanks @evanh . Can you elaborate how that works? I'm totally new to this actually so any help is welcome.

    And would you recommend the propeller 1 based on my requirements/specs?

  • evanhevanh Posts: 15,905
    edited 2024-04-07 09:37

    Hehe, always recommended. :)

    Basic idea is setup the speaker module (object) to run independently in its own core (cog). It simply waits for an audio buffer to be played filled and plays it, then waits for the next.

    The main object can handle the sequence of waiting for a button press, then loading the first word into a buffer signalling the audio player to start from that buffer. The main object then immediately moves on to loading the second word into a second buffer and signalling it is ready to play as well. It'll then have to wait for the first buffer to come free before loading the third word into that ... rinse and repeat until sentence is complete. Then go back to waiting for the button press.

    EDIT: Fixed the typo.

  • Christof Eb.Christof Eb. Posts: 1,194

    Hi,
    If the device shall run only from batteries, then I would recommend to have a very close look at power consumption. And if you want to use a module, then often its voltage regulator alone will draw too much current, so you have to switch off the entire module.
    For AA cells with 2500mAh and 1.5 years 2500/365/1.5/24=0.19mA.
    Using mains power supply with battery backup would open up much more possibilities.

  • Beau SchwabeBeau Schwabe Posts: 6,566

    If it were me I would lean towards a Phone app. Either something that already exists, or create my own. Even a Web based app that could run on a Phone or a PC.

  • iseriesiseries Posts: 1,492

    @"Beau Schwabe" , If the person is blind how is he going to see a button on a phone or even be able to call up the app to push the button.

    There are very few buttons on a phone and a lot of buttons on a PC.

    This project calls for the:

    Now how to replace the guts with a clock.

    Mike

  • softconsoftcon Posts: 217

    My guess is the OP wants a stand-alone device, not something dependent on computers/phone, since those devices already have methods of getting the time. Screen readers for every operating system exist, so no problem getting the time out of an android or apple device. Even the apple watch has a screen reader built in.
    Just a couple days ago, I was looking for a replacement for the emic2 (I only have three of them), and I ran across several speech modules, multiple ones that already speak in chinese, so just using one of those, and interfacing it to the basic stamp, propeller, or arduino would do the job nicely. Failing that, there's already companies that produce talking clocks for the visually impaired, Maxi aids being the first one that comes to mind.
    Lots of ways to handle this one. In fact, I just came to this forum hunting for the code Chip posted several years ago of the propeller 1 speaking (he had it generating the speech "Can you do it?" If anyone has the link to that post, I'd sure appreciate it.

  • lab_geslab_ges Posts: 91

    Hi, I just did a search for the P1 Speech Synthesis and came up with this, I think it is what you were looking for but you may have found it in the few months since you asked for it.
    https://forums.parallax.com/discussion/114012/speech-synthesis-on-the-propeller

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