Arduino Uno 使用电子墨水屏(2.9inch e-Paper Module (B))

实验效果

在微雪的电子水墨屏上显示图片和文字。

(声明:这并没有广告费的,只是分享经验。哎,还挺贵的,能三连就是最好的支持了)

元件说明

本次示例中的电子水墨屏型号,其他本品牌的型号驱动方式雷同,选择正确的配置即可。

arduino-use-2point9inch-epaper-display-img_xn

工作电压:3.3V 分辨率:296 x 128 显示颜色:红,黑,白 全局刷新:15s 待机功耗:< 0.017mw 可视角度:> 170 通信接口:3-wire SPI,4-wire SPI 显示尺寸:66.89mm x 29.05mm 灰度等级:2 刷新功耗:26.4mW(typ.) 点距:0.138 x 0.138 外形尺寸:79.0 mm x 36.7 mm x 1.05mm

【备注】: 刷新时间:刷新时间为实验测试数据,实际刷新时间会有误差,以实际效果为准。全局刷新过程中会有闪烁效果,这个是正常现象 功耗:功耗数据为实验测试数据,实际功耗由于驱动板的存在和实际使用情况的不同,会有一定误差,以实际效果为准

更多屏幕对应型号「 2.9inch e-Paper Module (B) 」资料:

https://www.waveshare.net/wiki/2.9inch_e-PaperModule(B

BOM表

名称 数量
Arduino Uno x1
微雪 2.9inch e-Paper Module (B) x1
转接板带SPI接口(配套) X1
跳线(杜邦线) 若干

驱动并点亮电子墨水屏

驱动点亮电子水墨屏有2个方法,一个是通过官网提供的方式点亮(亲测可点亮)相对较容易,简单说明一下,另一个则是使用GxEPD2,配置会有点繁琐,但通用性比较好,会重点介绍。

1,使用微雪官方提供的示例程序驱动点亮电子墨水屏

请参考微雪官方提供的接线方式和下载对应的程序即可。

接线图

E-paper

程序代码

这种方式的程序就不贴在这里了。

程序下载地址:https://www.waveshare.net/w/upload/3/39/E-Paper_code.7z

例如,这里使用的是「2.9inch e-paper B(黑白红)电子水墨屏」对应的程序则是「epd2in9bc」

官方提供的资料非常完整,在这里就不再重复了。https://www.waveshare.net/wiki/2.9inch_e-PaperModule(B)#Arduino

2,使用GxEPD2库驱动点亮电子墨水屏

安装库

库地址:https://github.com/ZinggJM/GxEPD2

此库也可以在Arduino IDE 的库管理中搜索得到并且可以安装。值得注意的是,在这里我们使用的是「GxEPD2」

arduino-use-epaper290b-library-install_xn

安装好库之后,我们打开示例:GxEPD2_Example,会发现这个程序还挺复杂的,上面有多个代码选项卡,大概看了一下代码,这个库挺强大的支持不少开发板,例如除了Arduino Uno 和Arduino 常用系列外,还支持ESP8266,ESP32,STM32等等。

但要正确使用,则需要正确选择配置使用的开发板和水墨屏型号:

在本示例使用的水墨屏是 「 2.9inch e-paper B(黑白红)」配置如下:

例如使用GxEPD2_Example这个示例,需要在GxEPD2_Example这个代码文件中,找到以下位置选择对应2.9inch的选项,去掉其注释,并把其他的都注释起来。

#include "bitmaps/Bitmaps3c128x296.h" // 2.9"  b/w/r

在本示例使用的开发板是 「Arduino Uno」配置如下:

找到代码选项卡「GxEPD2_display_selection.h」,在#define MAX_HEIGHT(EPD) .....这行代码的下面

找到 GxEPD2_3C \<GxEPD2_290c, MAX_HEIGHT_3C(GxEPD2_290c)> display(GxEPD2_290c....,把其注释去掉。

配置好了,就可以点击上传按钮,把代码上传到开发板上,就能看到电子水墨屏显示「hello world!」并在跑测试程序。

总结Arduino Uno的配置代码:
// 注意,以下定义适配 微雪2.9寸三色(黑白红)电子墨水屏在 Arduino Uno 使用 
// 更多其他开发板,电子墨水屏的定义请查看GxEPD2库的例子
#define MAX_DISPLAY_BUFFER_SIZE 800
#define MAX_HEIGHT_3C(EPD) (EPD::HEIGHT <= (MAX_DISPLAY_BUFFER_SIZE / 2) / (EPD::WIDTH / 8) ? EPD::HEIGHT : (MAX_DISPLAY_BUFFER_SIZE / 2) / (EPD::WIDTH / 8))
GxEPD2_3C<GxEPD2_290c, MAX_HEIGHT_3C(GxEPD2_290c)> display(GxEPD2_290c(/*CS=10*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));

接线方式

首先,看看接线图:

arduino-use-2point9inch-epaper-display-wiring-x_xn

图片取模软件

具体使用方法,请查看本示例的视频教程。

程序代码

// by LingShunLAB.com
// refer:GxEPD2 library

#define ENABLE_GxEPD2_GFX 0

#include <GxEPD2_3C.h>  // 加载 三色屏幕 GxEPD2 库 
#include <Adafruit_GFX.h>  // 加载 Adafruit_GFX 库

// 注意,以下定义适配 微雪2.9寸三色(黑白红)电子墨水屏在 Arduino Uno 使用 
// 更多其他开发板,电子墨水屏的定义请查看GxEPD2库的例子
#define MAX_DISPLAY_BUFFER_SIZE 800
#define MAX_HEIGHT_3C(EPD) (EPD::HEIGHT <= (MAX_DISPLAY_BUFFER_SIZE / 2) / (EPD::WIDTH / 8) ? EPD::HEIGHT : (MAX_DISPLAY_BUFFER_SIZE / 2) / (EPD::WIDTH / 8))
GxEPD2_3C<GxEPD2_290c, MAX_HEIGHT_3C(GxEPD2_290c)> display(GxEPD2_290c(/*CS=10*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));

// Include fonts from Adafruit_GFX
#include <Fonts/FreeMono9pt7b.h>
#include <Fonts/FreeMono12pt7b.h>
#include <Fonts/FreeMono18pt7b.h>
#include <Fonts/FreeMono24pt7b.h>
#include <Fonts/FreeMonoBold9pt7b.h>
#include <Fonts/FreeMonoBold12pt7b.h>
#include <Fonts/FreeMonoBold18pt7b.h>
#include <Fonts/FreeMonoBold24pt7b.h>

// 图像logo_1 取模数据 
// 大小:300 x 86 像素
// 复制取模数据后,需要添加 PROGMEM 修饰符,表示变量存储在闪存上
const unsigned char gImage_logo_1[3268] PROGMEM = { /* 0X00,0X01,0X2C,0X01,0X56,0X00, */
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// 图像logo_2 取模数据 
// 大小:300 x 86 像素
// 复制取模数据后,需要添加 PROGMEM 修饰符,表示变量存储在闪存上
const unsigned char gImage_logo_2[3268] PROGMEM = { /* 0X00,0X01,0X2C,0X01,0X56,0X00, */
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void setup() {
  display.init(115200);  // 初始化屏幕
  display.setRotation(1);  // 设置屏幕旋转方向,分别有0,1,2,3这四个方向
  display.setTextWrap(false); // 设置文本是否自动换行,false则为不自动换行,如果文本溢出则显示异常或者不显示

  const char HelloWorld[] = "Hello World!"; // 

  display.setFont(&FreeMonoBold9pt7b); // 设置 文本字体
  display.setTextColor(GxEPD_BLACK); // 设置 文本颜色

  int16_t tbx, tby;  // 文本框的x,y坐标
  uint16_t tbw, tbh; // 文本框的宽度,高度
  display.getTextBounds(HelloWorld, 0, 0, &tbx, &tby, &tbw, &tbh); // 计算渲染后的文本框的长度和宽度,用于居中
  uint16_t x = ((display.width() - tbw) / 2) - tbx; // 文本框的x坐标
  uint16_t y = ((display.height() - tbh) / 2) - tby; // 文本框的y坐标
  display.setFullWindow(); 
  display.firstPage(); 
  do
  { 
    display.fillScreen(GxEPD_WHITE); // 清屏(全平白色)
    //           (POSITION_X, POSITION_Y, IMAGE_NAME, IMAGE_WIDTH, IMAGE_HEIGHT, COLOR)
    display.drawBitmap(0,         0,     gImage_logo_1,   300,          86,      GxEPD_BLACK); // 在屏幕坐标(0,0)的位置显示 logo_1,大小为宽300,高86像素,颜色为黑色
    display.drawBitmap(0,0, gImage_logo_2, 300,86, display.epd2.hasColor ? GxEPD_RED : GxEPD_BLACK); // 在屏幕坐标(0,0)的位置显示 logo_1,大小为宽300,高86像素,颜色为红色
    display.setCursor(x, y+40); // 设置指针位置
    display.print(HelloWorld); // 显示文本
  }
  while (display.nextPage());
}

void loop() {
}