Espruino JavaScript
UART problems connecting to BT201 Bluetooth audio 4-in-1 module #7990
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I can't see any other's experiences but I've hit a brick wall with communicating from the jolt.js to this BT201 sound playout module. I've successfully powered the BT201 either on 5V in parallel with the jolt or powered from the Q0 connector, but serial1 communication is not working. It needs 115200 baud rate and I've tried mapping Serial1 to D0 and D1 (and visa versa) off the Q0 connector and using H6/H7 (and visa versa). I cannot get the onData to show me a response. I've tried a redundant shared ground wire too. I also get no response looping the serial line back with a wire. This is the module:
These are the two ways I've tried it: |
Replies: 1 comment 4 replies
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It feels like it should work ok - can you share the code you used? For serial you should definitely try and use the Qwiic connectors, since H0..7 are designed for higher voltage inputs so divide the voltage down too much to be used directly for UART (although there are some hacks available) Sometimes RX/TX end up labelled wrong (they label what they expect you to connect them to rather than what they are) so it's worth trying to configure Serial both ways around if it's a problem. |
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I've since got the bt201 running from a pc (using an xbee explorer board 😂) so I know that the baud rate and pin connections were correct. I swapped rx and tx many times to rule that out. However, the commands I was sending were incorrect so I'll try again on Q0/D0/D1 now I'm certain the wiring is physically working, and see if I can get an onData event |
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Great! Just to check, on Q0 it'd be |
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Just a thought though... I was planning to use the bt201 to play out sentences made up of short samples, firing them in sequence seamlessly. Then I spotted QOA data via Waveform class could drive a speaker on the jolt directly. Could I compose each sentence from source clips in memory and playout as a single utterance? Source clips are currently m4a or mp3 but could be converted... |
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Yes, absolutely. There's actually an example of a talking clock using Jolt.js at https://www.espruino.com/Jolt.js+Talking+Clock that might be a good starting point! The high power drivers will happily handle a speaker. While you could compose everything in RAM first I'd be tempted just to play the samples back to back. |
Great! Just to check, on Q0 it'd be
Q0.sclandQ0.sda-D0/D1themselves are pins that are usable from JS but I'm pretty sure they won't do what you want (D0 is the button for instance)