ESP32: BPI-BIT 开发板外设按键与LED矩阵学习（Arduino）

Chentoday · 2019 年7 月 20 日 06:02

前言

今天了解和学习如何使用 bpibit 上的按键与 LED 面板

下面示例会用到 NeoPixelBus 库，所以需要到 Arduino 库管理中下载

操作环境

测试使用的开发板： bpi-bit v1.2

应用到的外设： WS2812b

测试使用的软件：Arduino IDE 1.8.9

函数解析

RgbColor(uint8_t r, uint8_t g, uint8_t b) : R(r), G(g), B(b) { }; 使用r、g、b值（0-255）构造 rgbcolor

void SetPixelColor(uint16_t indexPixel, typename T_COLOR_FEATURE::ColorObject color)在指定的位置的灯点亮相应颜色

参数	功能
indexPixel	LED 面板的标号(关于标号可以拉到下面看参考资料)
color	自定义的颜色

代码解释

NeoPixelBus<NeoGrbFeature, Neo800KbpsMethod> strip(PixelCount, PixelPin)配置 NeoPixelBus 对象

示例代码

#include <NeoPixelBus.h>

const uint16_t PixelCount = 25;
const uint8_t PixelPin = 4;

#define colorSaturation 128
#define delay_ms 500

NeoPixelBus<NeoGrbFeature, Neo800KbpsMethod> strip(PixelCount, PixelPin);

RgbColor red(colorSaturation, 0, 0);
RgbColor green(0, colorSaturation, 0);
RgbColor blue(0, 0, colorSaturation);
RgbColor white(colorSaturation);
RgbColor black(0);
RgbColor num1(0.8 * colorSaturation, 0, 0.2 * colorSaturation);
RgbColor num2(0.5 * colorSaturation, 0, 0.5 * colorSaturation);
RgbColor num3(0.25 * colorSaturation, 0, 0.75 * colorSaturation);

#define ledPower 2 //It's very important for the v1.2, if you use the v1.4 ,you can delete it
// #define BottomA 35
// #define BottomB 27

void setup()
{
    Serial.begin(115200); //Serial Port Config 115200-8-N-1
    //while (!Serial); // wait for serial attach

    Serial.println();
    Serial.println("Initializing...");
    Serial.flush();

    // this resets all the neopixels to an off state
    strip.Begin();
    strip.Show();

    //You can also use BUTTON_A / BUTTON_B
    pinMode(BUTTON_A, INPUT);//Botton A Pin Mode :Digital Input 
    pinMode(BUTTON_B, INPUT);//Botton B Pin Mode :Digital Input
    
    //It's very important for the v1.2, if you use the v1.4 ,you can delete it
    pinMode(ledPower,OUTPUT);
    digitalWrite(ledPower, HIGH); 
}

void loop()
{
    if (digitalRead(BUTTON_A) == LOW)
    {
        delay(10);
        if (digitalRead(BUTTON_A) == LOW)
        {
             strip.SetPixelColor( 6, num1);
             strip.SetPixelColor( 7, num1);
             strip.SetPixelColor( 8, num1);
             strip.SetPixelColor( 9, num1);
             strip.SetPixelColor(10, num1);
             strip.SetPixelColor(13, num1);
             strip.SetPixelColor(16, num1);
             strip.SetPixelColor(17, num1);
             strip.SetPixelColor(18, num1);
             strip.SetPixelColor(19, num1);
            strip.Show();
        }
        else
        {
        int i;
        Serial.println("Turn Off");
            for (i = 0; i <= PixelCount - 1; i++)
            {
            strip.SetPixelColor(i, black);
            strip.Show();
            }
        }
    }


     if (digitalRead(BUTTON_B) == LOW)
    {
        delay(10);
        if (digitalRead(BUTTON_B) == LOW)
        {
            //strip.SetPixelColor( 5, num2);
            strip.SetPixelColor( 6, num2);
            strip.SetPixelColor( 7, num2);
            strip.SetPixelColor( 8, num2);
            strip.SetPixelColor( 9, num2);
            strip.SetPixelColor(10, num2);
            strip.SetPixelColor(12, num2);
            strip.SetPixelColor(14, num2);
            strip.SetPixelColor(15, num2);
            strip.SetPixelColor(16, num2);
            strip.SetPixelColor(17, num2);
            strip.SetPixelColor(18, num2);
            strip.SetPixelColor(19, num2);
            strip.Show();
        }
        else
        {
        int i;
        Serial.println("Turn Off");
            for (i = 0; i <= PixelCount - 1; i++)
            {
            strip.SetPixelColor(i, black);
            strip.Show();
            }
        }
    }
}

现象

按下按键A，LED面板显示字母A；按下按键B，LED面板显示字母B

在这里插入图片描述

参考资料

BPI-STEAM

NeoPixelBus 库(github)

总结

利用 NeoPixelBus 库点亮一颗颗灯，便能形成图案。在了解到 bpi-bit 有这好看的 LED 矩阵，我萌生了利用 LED 矩阵以及按键实现贪吃蛇小游戏的想法

需注意

在 Arduino IDE 上，开发板的选择需选 BPI-BIT

ESP32: BPI-BIT 开发板外设 按键与LED矩阵 学习（Arduino）

前言