I have a Polaris NB IoT board. I wish to connect it to a speaker that plays music via a bluetooth module. I currently have this bluetooth module with a CSR8645 chip, which I can connect to my TPA3116 amplifier and play music, however I wish to set a varying maximum volume from my Polaris board based on GPS data. How can I accomplish this? I have read about RX/TX pins which can send such information but my module does not seem to have these. I am open to acquiring new hardware for this purpose. Thanks in advance!
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As the processor based Polaris NB IoT board is to control volume consider adding a digital pot between the Bluetoot sound source and the TPA3116 amplifier.
There are many digital pot integrated circuits available (as seen on this digital pot filtered Digikey web page). All of which would take some electrical engineering knowledge to integrate into an existing design.
Consider searching for project like this one where an amplifier is built with a digital pot. Such a design might be used for the bases of adding a digital pot between an existing sound source and amplifier.
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