====== Talking Shoe ======

https://github.com/moink/talking_shoe


^ Lolin-Port  ^ Part-Port                              ^ Part            ^
| GPIO19      | SDA                                    | ADXL345         |
| GPIO23      | SCL                                    | ADXL345         |
| GPIO17      | RX                                     | DFPlayer        |
| GPIO16      | TX                                     | DFPlayer        |
| GPIO34      | Resistor Leg, but not on the Resistor  | Photo Resistor  |


===== Micro Controller: Lolin32 Lite =====


{{ :shoe:lolin32.svg?1000 }}

  * 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:

<code c>
#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
}
</code>

===== MP3 Player: DFPlayer Mini =====

{{ :shoe:dfplayer.svg?400 }}


  * [[https://wiki.dfrobot.com/dfplayer_mini_sku_dfr0299|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''
  * [[https://github.com/DFRobot/DFRobotDFPlayerMini|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


===== Accelleration Sensor: ADXL345 =====

{{ :shoe:adxl345.svg?300 }}


  * [[https://learn.adafruit.com/adxl345-digital-accelerometer/overview|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

===== Photo Resistor =====

<code>
3.3V ── LDR ──+─── GPIO34 (A0)
              │
            10kΩ
              │
             GND
</code>


===== IR Opto-Switch =====

**we're not using this one**

  * I bought [[amazon.de>B00EFOTJZE]] these
  * I think we should be able to simply connect them to two GPIO pins
    * actually the emitter can probably be just powered permanently
      * not sure if I need a resistor, the Amazon page contains really shitty translations
      * I should hook up one of the diodes to my component tester
      * actually based on the given foward voltage and current, according to an online calculator I need resistor of about 70ohm
  * The sensor is a VS 1838B


<code>
   _____
  |     |
  |     |
  |     |
  |     |
  |_____|
   | | |
   1 2 3

1: OUT (Signal)
2: GND
3: VCC (typically 3.3–5V)
</code>