Afternoon,
I'm having trouble with doing serial transmission on an Adafruit 5v trinket. The maddening part is that I know I got it working on a previous project and am using the same code and am 90% sure I have the board wired the same, but cannot get it to work regardless of what I try.
I am trying to communicate with a "ANGEEK YX5300 UART Control Serial MP3 Music Player Module" and if I use a standard Arduino Uno with the following code it works perfectly, but it doesn't with the Trinket (note I don't bother connecting the Rx pin from the uno/trinket (pin 2) to the Tx pin on the MP3 player as I'm not needing responses from the MP3 player).
Using my multimeter I can see that both are transmitting something to the Rx pin on the MP3 player board, but without an oscilloscope I can't tell if it's a speed/timing issue or a voltage level issue.
Any advice on what I am doing wrong or an alternative approach for cheap and compact MP3 playing would be greatly appreciated, cheers.
#include <SoftwareSerial.h>
#define rxPin 2
#define txPin 1
// Create a software serial object for the connection to the MP3 module
SoftwareSerial mp3 = SoftwareSerial( rxPin, txPin );
void setup() {
mp3.begin(9600);
pinMode(1, OUTPUT);
}
void loop() {
//7E FF 06 0F 00 01 01 EF (play song 001.mp3)
mp3.write(126);
mp3.write(255);
mp3.write(6);
mp3.write(15);
mp3.write((byte)0);
mp3.write(1);
mp3.write(1);
mp3.write(239);
delay(5000);
}
