Use the edge on the bicrobit V2

fenyi · February 7, 2021, 8:28am

Hi

I just watched your video:https://www.youtube.com/watch?v=fNSKWdIxh8o

It is really cool, BTW, I want to ask how to change the emoji of LED display, like when I say microbit, how to make it display other graphic patterns or I connect a LED then turn on/off on the microbit board? could you make a tutorial or give some advances, please?

Best regards
fenyi

janjongboom · February 7, 2021, 9:58am

@fenyi sure, the code is here:

github.com

edgeimpulse/voice-activated-microbit/blob/de4221a9cd51db915ac1bc41e215735212e0b8ff/source/MicrophoneInferenceTest.cpp#L52


*/
static int microphone_audio_signal_get_data(size_t offset, size_t length, float *out_ptr)
{
   numpy::int8_to_float(&inference.buffers[inference.buf_select ^ 1][offset], out_ptr, length);
   return 0;
}
/**
* Invoked when we hear the keyword !
*/
static void heard_keyword() {
   const char * happy_emoji ="\
       000,255,000,255,000\n\
       000,000,000,000,000\n\
       255,000,000,000,255\n\
       000,255,255,255,000\n\
       000,000,000,000,000\n";
   MicroBitImage img(happy_emoji);
   uBit.display.print(img);
}

Here you have 25 values (5x5 pixels), and to turn a pixel on you set 255, to turn one off 0, and to put one to 50% brightness to 127.