BoatGaugesAlt

The alternative example sketch for six different boat gauges came about due to an issue with original code.

Which I also came across and reported it under original project here.

The solution boils down to removing reliance on the needle bounding box coordinates which are pre-populate in the setup() method:

  while (a != 44) {
    x[i] = r * cos(rad * a) + sx;
    y[i] = r * sin(rad * a) + sy;
    x2[i] = (r - 20) * cos(rad * a) + sx;
    y2[i] = (r - 20) * sin(rad * a) + sy;

    i++;
    a++;

    // reset "a" on overflow
    if (a == 360) {
      a = 0;
  }

Code repositories

• For live demonstration visit [https://www.youtube.com/watch?v=y_H7HM0oyoo]
• For original code visit VolosR/BoatGauges
• For original code with comments visit iiminov/BoatGauges

Arduino IDE Setup

1. Install ESP32 boards library guide from randomnerdtutorials
2. Install TFT_eSPI library by Bodmer through Library Manager (Sketch > Include Library > Manage Libraries or Ctrl+Shift+l)

Configure TFT_eSPI library

Open ..\Documents\Arduino\libraries\TFT_eSPI\User_Setup.h and comment out line 44:

//#define ILI9341_DRIVER

On line 64 uncomment GC9A01 driver:

#define GC9A01_DRIVER

Open ..\Documents\Arduino\libraries\TFT_eSPI\User_Setup_Select.h and comment out line 24:

//#include <User_Setups/Setup1_ILI9341.h>

On line 105 uncomment GC9A01 setup:

#include <User_Setups/Setup200_GC9A01.h>

Open ..\Documents\Arduino\libraries\TFT_eSPI\User_Setups\Setup200_GC9A01.h and update pin assignments:

#define TFT_MISO 5
#define TFT_MOSI 2
#define TFT_SCLK 15  // Clock pin
#define TFT_CS   17  // Chip select control pin
#define TFT_DC   16  // Data Command control pin
#define TFT_RST  4   // Reset pin (could connect to Arduino RESET pin)

ESP32 & GC9A01 Connections

Image is courtesy of WOKWI.com and some MS Paint work

ESP32     GC9A01
3V3       VCC
GND       GND
D15       SCL
D2        SDA
D4        RES
RX2       DC
TX2       CS
D5        BLK