St7739 1.44 lcd oscilloscope

Projects Programming
1 
#include <Adafruit_ST7735.h>
#include <SPI.h>

// 定义TFT LCD引脚
#define TFT_SCLK 13  // SCL
#define TFT_MOSI 11  // SDA
#define TFT_RST  9   // RES
#define TFT_DC   8   // DC
#define TFT_CS   10  // CS

// 定义按钮引脚
#define BUTTON_PIN 2

// 创建TFT LCD对象
Adafruit_ST7735 tft = Adafruit_ST7735(TFT_CS, TFT_DC, TFT_MOSI, TFT_SCLK, TFT_RST);

// 定义输入引脚
const int inputPin = A0;

bool isRunning = false;

void setup() {
  // 设置按钮引脚为输入模式
  pinMode(BUTTON_PIN, INPUT_PULLUP);

  // 设置SPI时钟频率
  SPI.setClockDivider(SPI_CLOCK_DIV16); // 1 MHz

  // 初始化TFT LCD
  tft.initR(INITR_BLACKTAB);
  tft.setRotation(1);
  tft.fillScreen(ST7735_BLACK);
  tft.setTextColor(ST7735_WHITE);
  tft.setTextSize(1);
  tft.setCursor(0, 0);
  tft.println("Oscilloscope");
}

void loop() {
  // 检查按钮状态
  if (digitalRead(BUTTON_PIN) == LOW) {
    isRunning = !isRunning;
    delay(200); // 防止按钮抖动
  }

  if (isRunning) {
    // 读取输入引脚的值
    int value = analogRead(inputPin);

    // 清空TFT LCD
    tft.fillScreen(ST7735_BLACK);

    // 绘制波形
    for (int x = 0; x < 144; x++) {
      int y = map(value, 0, 1023, 0, 159);
      tft.drawPixel(x, y, ST7735_WHITE);
      value = analogRead(inputPin);
      delayMicroseconds(1); // 将采样频率设置为 1 MHz
    }
  } else {
    tft.setCursor(0, 20);
    tft.println("Press button to start");
  }
}
2

As your topic does not relate directly to the installation or operation of the IDE it has been moved to the Programming Questions category of the forum

Do you have a question relating to the code that you posted ?

3

YES it is

4

Sorry but I don't understand what you are saying

I repeat, do you have a question about the code that you posted ?

5

yes it's not correct

6

We are making slow progress because you are not providing good information

  • Which Arduino board are you using ?
  • Does the code compile ?
  • If it compiles what does it do or not do ?
7

NANO
Yes
It's can't Detect high HZ

8

What is your definition of high frequency in this case ?

9 
#include <Adafruit_ST7735.h>
#include <SPI.h>

// 创建TFT LCD对象                     CS, DC, MOSI, SCLK, RST
Adafruit_ST7735 tft = Adafruit_ST7735 (10,  8,   11,   13,   9);

// 定义输入引脚
const int inputPin = A0;
const byte BUTTON_PIN = 2;
      byte butState;

bool isRunning = false;

const int BufSize = 144;
      int buf [BufSize];

// -----------------------------------------------------------------------------
void loop ()
{
    byte but = digitalRead (BUTTON_PIN);
    if (butState != but) {              // change
        butState = but;
        delay (20);                     // debounce

        if (LOW == but)
            isRunning = !isRunning;
    }

    if (! isRunning)
        return;

    // capture samples -- max ~10000/sec
    for (int n = 0; n < BufSize; n++)
        buf [n] = analogRead (inputPin);

    // display samples
    tft.fillScreen (ST7735_BLACK); // 清空TFT LCD
    for (int n = 0; n < BufSize; n++)  {
        int y = map (buf [n], 0, 1023, 0, 159);
        tft.drawPixel (n, y, ST7735_WHITE);
    }
}

// -----------------------------------------------------------------------------
void setup () {
    // 设置按钮引脚为输入模式
    pinMode (BUTTON_PIN, INPUT_PULLUP);
    butState = digitalRead (BUTTON_PIN);

    // 设置SPI时钟频率
    SPI.setClockDivider (SPI_CLOCK_DIV16); // 1 MHz

    // 初始化TFT LCD
    tft.initR         (INITR_BLACKTAB);
    tft.setRotation   (1);
    tft.fillScreen   (ST7735_BLACK);
    tft.setTextColor (ST7735_WHITE);
    tft.setTextSize  (1);
    tft.setCursor    (0, 0);

    tft.println ("Oscilloscope");
}
10

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