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Arduino - esp32-c3-32s (ILI9341) with Touchscreen

· 3 min read
Gabriel J. Csapo

This tutorial goes over how to use an ILI9341 with a touchscreen driven by an esp32-c3-32s!

Supplies​

  • (1) esp32-c3-32s
  • (13) Jumper wires
  • (1) ILI9341 with Touchscreen

For refrence I have included the pinout diagram for the esp32-c3-32s that I am using.

esp-c3-32s-kit-v1.0_specification.pdf

Checkup​

It's always good to double-check we are using the right screen as many screens look touch-capable but are not. Check out the steps to make sure they are by reading https://www.gabrielcsapo.com/hardware-how-to-identify-an-ili9341-that-supports-touch/.

Setup​

Alright, now that we have figured out if the touchscreen you have is touch-capable, time to set up the esp32-c3-32s and the ILI9341 display.

esp32-c3-32s PinTFT Pin
3v3VCC
GNDGND
IO7CS
IO1RESET
IO8DC
IO6SDI (MOSI)
IO4SCK
LED3v3
IO4T_CLK
IO2T_CS
IO6T_DIN
IO5T_DO

Wiring diagram connecting ILI9341 screen to esp32-c3-32s
Wiring diagram connecting ILI9341 screen to esp32-c3-32s

arduino-esp32-c3-32s-ili9341-with-touchscreen.fzz

Coding​

For this project, we are using the following libraries:

  1. Adafruit_GFX
  2. Adafruit_ILI9341
  3. XPT2046_Touchscreen

For information on how to install the libraries above please visist https://www.arduino.cc/en/guide/libraries.

Flash settings​

  • USB CDC on boot: disabled
  • Board: ESP32c3 Dev Module
  • CPU Frequency: 80MHZ
  • Flash Frequency: 80MHZ
  • Flash Mode: DIO
  • Flash Size: 4MB
  • Partition Scheme: Default 4MB with spiffs
  • Upload Speed: 115200
#include "Adafruit_GFX.h"#include "Adafruit_ILI9341.h"#include <XPT2046_Touchscreen.h>#include <SPI.h>#define _sclk              4#define _mosi              6#define _miso              5#define CS_PIN 2#define TFT_DC 8#define TFT_CS 7#define TFT_RST  1XPT2046_Touchscreen ts(CS_PIN);Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_RST);void setup() {  Serial.begin(38400);  SPI.begin( _sclk, _miso, _mosi );  SPI.setFrequency( 40000000 );  tft.begin(4000000);  tft.setRotation(1);  tft.fillScreen(ILI9341_BLACK);  ts.begin();  ts.setRotation(1);  while (!Serial && (millis() <= 1000));}boolean wastouched = true;void loop() {  boolean istouched = ts.touched();  if (istouched) {    TS_Point p = ts.getPoint();    if (!wastouched) {      tft.fillScreen(ILI9341_BLACK);      tft.setTextColor(ILI9341_YELLOW);      tft.setCursor(60, 80);      tft.print("Touch");    }    tft.fillRect(100, 150, 140, 60, ILI9341_BLACK);    tft.setTextColor(ILI9341_GREEN);    tft.setCursor(100, 150);    tft.print("X = ");    tft.print(p.x);    tft.setCursor(100, 180);    tft.print("Y = ");    tft.print(p.y);    Serial.print(", x = ");    Serial.print(p.x);    Serial.print(", y = ");    Serial.println(p.y);  } else {    if (wastouched) {      tft.fillScreen(ILI9341_BLACK);      tft.setTextColor(ILI9341_RED);      tft.setCursor(120, 50);      tft.print("No");      tft.setCursor(80, 120);      tft.print("Touch");    }    Serial.println("no touch");  }  wastouched = istouched;  delay(100);}

Upon running this, you should be able to get the following output