My simple Etch A Sketch project

The project in action

What you’ll need

• 1 x ST7735 1.8″ TFT display
• 2 x potentiometers
• 5 x 1k resistors
• 1 x breadboard
• 1 x Arduino Uno R3
• …a bunch of jumper wires

Wiring guide

The code

#include <Adafruit_GFX.h>
#include <Adafruit_ST7735.h>
#include <SPI.h>

#define TFT_CS     9
#define TFT_DC     10
#define TFT_RST    8
 
Adafruit_ST7735 tft = Adafruit_ST7735(TFT_CS, TFT_DC, TFT_RST);
 
float p = 3.1415926;

int controlX = A0;
int controlY= A1;
int valueX = 0;
int outputValueX = 0;
int valueY = 0;
int outputValueY = 0;

void setup() {
  tft.initR(INITR_BLACKTAB);
  uint16_t time = millis();
  tft.fillScreen(ST7735_BLACK);
  time = millis() - time;
  delay(500);
}

void loop() {
  valueX = analogRead(controlX);
  outputValueX = map(valueX, 0, 1023, 0, 128);
  valueY = analogRead(controlY);
  outputValueY = map(valueY, 0, 1023, 0, 160);
  tft.drawPixel(outputValueX, (outputValueY-160)*-1, ST7735_WHITE);
}