_ESP32-TTGO-BATTERY-OLED.md

LOLIN ESP32 module with LCD and Battery

Notes for future reference

Board that I am using: Aliexpress link

** Setting up the OLED screen with lcdgfx library **

DisplaySSD1306_128x64_I2C display(-1,{1,0x3C, 4, 5, 0}); 
// or (-1,{busId, addr, scl, sda, frequency}). This line is suitable for most platforms by default
// The parameters are  RST pin, BUS number, CS pin, DC pin, FREQ (0 means default), CLK pin, MOSI pin
// ESP32 OLED uses pin 4 for SCL, Pin 5 for SDA, GPI16 is toggable blue led
// When using arduino if "ESP32 Wrover Module" selected GPIO16 blue led is on by default

referenced source

bluetooth-rotable.ino

/*
    MIT License

    Copyright (c) 2018-2019, Alexey Dynda

    Permission is hereby granted, free of charge, to any person obtaining a copy
    of this software and associated documentation files (the "Software"), to deal
    in the Software without restriction, including without limitation the rights
    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    copies of the Software, and to permit persons to whom the Software is
    furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included in all
    copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
    SOFTWARE.

#include "lcdgfx.h"

DisplaySSD1306_128x64_I2C display(-1, {1, 0x3C, 4, 5, 0}); // or (-1,{busId, addr, scl, sda, frequency}). This line is suitable for most platforms by default
// The parameters are  RST pin, BUS number, CS pin, DC pin, FREQ (0 means default), CLK pin, MOSI pin


uint32_t lastMillis;
uint8_t  hours = 10;
uint8_t  minutes = 35;
uint8_t  seconds = 0;

int LED = 16;
String serialval = "69";

#include "BluetoothSerial.h"
BluetoothSerial SerialBT;

void printSeconds()
{
  if (seconds & 1)
  {
    display.printFixed(54,  8, ":", STYLE_NORMAL);
  }
  else
  {
    display.printFixed(54,  8, " ", STYLE_NORMAL);
  }
}

void printMinutes()
{
  char minutesStr[3] = "00";
  minutesStr[0] = '0' + minutes / 10;
  minutesStr[1] = '0' + minutes % 10;
  display.printFixed(78,  8, minutesStr, STYLE_NORMAL);
}

void printHours()
{
  char hoursStr[3] = "00";
  hoursStr[0] = '0' + hours / 10;
  hoursStr[1] = '0' + hours % 10;
  display.printFixed(6,  8, hoursStr, STYLE_NORMAL);
}

void setup()
{
  pinMode(LED, OUTPUT);
  display.begin();
  display.fill(0x00);
  display.setFixedFont(comic_sans_font24x32_123);
  display.print(42);

  Serial.begin(115200);
  /* If no name is given, default 'ESP32' is applied */
  /* If you want to give your own name to ESP32 Bluetooth device, then */
  /* specify the name as an argument SerialBT.begin("myESP32Bluetooth"); */
  SerialBT.begin("turn-a-round-table");
  Serial.println("Bluetooth Started! Ready to pair...");

}

void loop()
{
  if (SerialBT.available()){
    serialval = SerialBT.readString();
    
    }
   display.fill(0x00);
   display.setTextCursor(0,0);
   display.print(serialval.toInt());
   delay(1000);
}

ESP32 Pinout Reference: Which GPIO pins should you use?

(https://randomnerdtutorials.com/esp32-pinout-reference-gpios/)

Encoder libraries
https://github.com/madhephaestus/ESP32Encoder/
https://github.com/PaulStoffregen/Encoder
https://forum.arduino.cc/t/rotary-encoder-using-interrupts/469066/3

/***************************************************
  Two phase quadrature encoder(Incremental)
* ****************************************************
   To determine motor with encode （CW OR CCW）

  @author Dong
  @version  V1.0
  @date  2016-5-26
  All above must be included in any redistribution
* ****************************************************/
#define  A_PHASE 2
#define  B_PHASE 3
unsigned int flag_A = 0;  //Assign a value to the token bit
unsigned int flag_B = 0;  //Assign a value to the token bit
/** *  */
void setup() {
  pinMode(A_PHASE, INPUT);
  pinMode(B_PHASE, INPUT);
  Serial.begin(9600);   //Serial Port Baudrate: 9600
  attachInterrupt(digitalPinToInterrupt( A_PHASE), interrupt, RISING); //Interrupt trigger mode: RISING
}
void loop() {

  Serial.print("CCW:  ");
  Serial.println(flag_A);
  Serial.print("CW: ");
  Serial.println(flag_B);
  delay(1000);// Direction judgement

}
void interrupt()// Interrupt function
{ char i;
  i = digitalRead( B_PHASE);
  if (i == 1)
    flag_A += 1;
  else
    flag_B += 1;
}