Voice Messages, Ideas, MD YX5300 Library

[ForrestErickson]

Per the note on the Possible Evolution Stages of the Project

Although "buzzers" and "sirens" of various kind are available, we eventually want a loudspeaker that can make various noises to provide information about the alarm level. Someday it may even support recorded messages in a human voice speaking a natural language. Imagine the voice of Scotty saying "She canna' take the strain, Captain!" in a Scottish accent.

The January/February 2021 issue of QEX magazine has an article, "HF SWR Meter for the Visually Impaired" which outlines a project which has "... vocal output for a measurement instrument". See starting at page 7. The project uses a Catalax YX5300 module controlled by a serial port on an UNO . Code for the UNO is found at: https://github.com/f4goh/vocalSwrMeter

The Arduino reference has a library for this module at: https://www.arduino.cc/reference/en/libraries/md_yx5300/

While not installed in the Arduino IDE by default, the MD YX5300 library is readily available through the library manager.

There are four examples with the library. And SD card is required to hold the audio files.

[ForrestErickson]

Another part, YX5200, with the additional advantageous features of a BUSY signal so the controller to which this part is interfaced can know if the audio is playing.

https://www.amazon.com/Anmbest-YX5200-DFPlayer-Supporting-Arduino/dp/B07JGWMPTF/ref=sr_1_1

Arduino Library for this YX5200 part: https://github.com/PowerBroker2/DFPlayerMini_Fast

[ForrestErickson]

This program had interesting discussion of alarm fatigue and working some ideas on better alarms:

https://www.20k.org/episodes/donotdisturb

[ForrestErickson]

I found a youtube about this module. https://www.youtube.com/watch?v=HSLKefx1VK4

There is some elaborate example code linked from that video here: https://drive.google.com/file/d/1rr-YXgf94nu-h283_bTH2wfjSn8lHaZI/view

[ForrestErickson]

If I understand correctly, this module does not drive a speaker directly. An audio amplifier IC to drive a speaker would be required. The LM386 is a likely part and here is the JLCPCB PN: https://jlcpcb.com/partdetail/TexasInstruments-LM386MX_1NOPB/C23573

It is only 0.55.