• Has battery charger built in
• Amazon Reviewer says to use ESP32 Arduino → WEMOS LOLIN32 board
  • Arduino ESP32 can be installed via the Board Manager
    • does not contain Lolin Board
  • esp32 by Espressif in the Board Manager is the right choice
    • contains WEMOS Lolin32 Lite
    • can be selected in Tools → Board
    • get Board Info does not return anything useful?

On-Board LED Blinking works:

#define LED_PIN 22   // Pin number for your built-in LED
 
void setup() {
  pinMode(LED_PIN, OUTPUT);  // Set the LED pin as an output
}
 
void loop() {
  digitalWrite(LED_PIN, HIGH);  // Turn the LED on
  delay(500);                   // Wait 500 milliseconds
  digitalWrite(LED_PIN, LOW);   // Turn the LED off
  delay(500);                   // Wait 500 milliseconds
}

• Wiki Entry
  • We probably can connect our speaker directly to the SPK pins
  • We can read the BUSY line to know if something is playing
    • high = busy
  • There are three modes.
    • We probably want to use the Serial Mode to directly play a certain file
      • this means we connect the UART pins between the ESP and the Player
    • Theres sample code in the wiki
  • Filenames: /MP3/0001.mp3
• Github Repo for Arduino Lib
  • Arduino IDE has “DFRobotDFPlayerMini” in the list of libraries
    • alternatively one seems to be able to download the zip from github and simply add it via Sketch → Include Library → Add .ZIP library
  • There are a whole bunch of other libraries when you search for DFPlayer…
    • some of them seem to be newer than the original
    • some of them might make handling other stuff while playing sound easier

• Lots of Details at Adafruit
• We want to connect to this via the i2c bus
• There's an ADXL345 Library by Adafruit, but also by others