I am making a project with GSM module, GPS and a push-button or any sensor arduino. I want that when the senor detetcs something or the button is pressed, the gps finds the coordinates of the location and the gsm makes a call to a specific number and plays a text to speech voice note to the caller. Is this project practical? If the TTS is not possible is there a way to play a pre-recorded voice to the caller? Which GSM module will I need because I have been confused by the number of modules
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text to speech is resource intensive and if all you want to say consist in canned messages then you indeed can look into a MP3 module such as DFPlayer Pro (or just mini)
You need to pick a GSM board that has audio input/output such as the SIM800C.
The output of the DFPlayer might not be suitable for the microphone input of the GSM module, so some possible adaptation will be needed
(source)
The Talkie library for Arduino can generate intelligible text to speech, but the vocabulary is limited, and hard wired into your code. Other than that, prerecorded MP3 files can be played by simple modules available on line.
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