# epaper_ble **Repository Path**: roamr/epaper_ble ## Basic Information - **Project Name**: epaper_ble - **Description**: 手机发送图片到墨水屏显示的功能。 - **Primary Language**: Unknown - **License**: Apache-2.0 - **Default Branch**: master - **Homepage**: None - **GVP Project**: No ## Statistics - **Stars**: 0 - **Forks**: 1 - **Created**: 2023-09-06 - **Last Updated**: 2023-09-06 ## Categories & Tags **Categories**: Uncategorized **Tags**: None ## README # epaper_ble This system can realize the function of sending pictures from mobile phones to display on epaper. ![image-20220903194737924](readme.assets/image-20220903194737924.png) ## Hardware * BLE/Arduino: HW-867 BLE-NANO, Bluetooth transparent transmission and Arduino functions with small size (【淘宝】https://m.tb.cn/h.UbusHO7?tk=RZzB2vR3OeD CZ3457 「适用于Arduino Nano升级版/集成CC2540 BLE蓝牙4.0/Ble-Nano主板」) * epaper: MH-ET LIVE,1.54 inch, Pixel 200x200 (【淘宝】https://m.tb.cn/h.U004xJN?tk=KRJU2vR4FCq CZ3457 「1.54寸墨水屏模块 E-paper电子纸显示屏 兼容Arduino STM32」) | 1.54 e-Paper | UNO /NANO V3.0/ PRO MINI /MEGA2560 | | ------------ | ---------------------------------- | | 5.0V | 5.0V | | GND | GND | | DIN | D11 | | CLK | D13 | | CS | D10 | | DC | D9 | | RST | D8 | | BUSY | D7 | ## Workflow * Use jupyter notebook to transcode images into hexadecimal codes. * Send hexadecimal codes with serial port by BLE Tools. (https://cloud.tencent.com/developer/article/1896977) * display image on epaper. ## jupyter notebook ### Deploy jupyter server on ubuntu https://zhuanlan.zhihu.com/p/44405596 https://blog.csdn.net/qq_34419607/article/details/109177125 ```shell # 安装环境 pip3 install -i https://pypi.tuna.tsinghua.edu.cn/simple jupyter pip3 install -i https://pypi.tuna.tsinghua.edu.cn/simple opencv-python # 生成配置文件jupyter_notebook_config.py jupyter notebook --generate-config # 输入 ipython，进入交互python环境 >>>from notebook.auth import passwd >>>passwd Enter passwd: # 这里输入你的密码 Verify passwd: #重复输入密码 >>>argon2:$argon2id$v=19$m=10240,t=10,p=8$YiTF3tI7ZWECTbNaa5VZtA$kaU+xbQSsMaZsH98sqoaGg #复制这段秘钥 # 修改配置文件 vim ~/.jupyter/jupyter_notebook_config.py #其中为了快速搜索定位，你会用到下列命令 /c.NotebookApp.ip # 回车 /c.NotebookApp.open_brower #回车 /c.NotebookApp.port #回车 /c.NotebookApp.allow_remote_access #回车 # 找到如下几项，取消注释并修改： c.NotebookApp.password ='argon2:$argon2id$v=19$m=10240,t=10,p=8$YiTF3tI7ZWECTbNaa5VZtA$kaU+xbQSsMaZsH98sqoaGg' #秘钥 c.NotebookApp.ip='*' # *允许任何ip访问 c.NotebookApp.open_browser = False # 默认不打开浏览器 c.NotebookApp.port =8888 # 可自行指定一个端口, 访问时使用该端口 c.NotebookApp.allow_remote_access = True c.NotebookApp.ip = '*' #所有绑定服务器的IP都能访问，若想只在特定ip访问，输入ip地址即可 c.NotebookApp.port = 6666 #将端口设置为自己喜欢的吧，默认是8888 c.NotebookApp.open_browser = False #我们并不想在服务器上直接打开Jupyter Notebook，所以设置成False c.NotebookApp.notebook_dir = '/root/jupyter_projects' #这里是设置Jupyter的根目录，若不设置将默认root的根目录，不安全 c.NotebookApp.allow_root = True # 为了安全，Jupyter默认不允许以root权限启动jupyter # 启动服务器 jupyter notebook ``` ### transcode images into hexadecimal codes ```python import os import cv2 import numpy as np files_before = [] for root, dirs, files in os.walk('.'): for name in files: if name[-3:] in ['bmp','png','jpg'] or name[-4:] in ['jpeg']: files_before.append(os.path.join(root, name)) if len(files_before)!=1: print("请重新上传照片，并再次运行程序") else: img = cv2.imread(files_before[0],cv2.IMREAD_GRAYSCALE) img = cv2.resize(img, (120, 120)) res = np.zeros(shape=(120,120)) lens = img.shape[0]*img.shape[1] for i in range(img.shape[0]): for j in range(img.shape[1]): tmp = int(img[i,j]/255+0.5) res[j,i] = round(tmp,1) res = res.reshape(-1) i=0 itr =0 encoder_img = '' while i < lens: tmp_str = '' for j in range(8):#Every 8 pixels form a byte tmp_str += str(res[i+j])[:1] hex_str = hex(int(tmp_str,2)) hex_str = hex(int(tmp_str,2)).swapcase() if len(hex_str)<4: hex_str=hex_str[:2]+'0'+hex_str[-1] encoder_img += hex_str[-2:] encoder_img += ',' i += 8 itr+=1 print(encoder_img) files_before = set() for root, dirs, files in os.walk('.'): for name in files: if name[-3:] in ['bmp','png','jpg'] or name[-4:] in ['jpeg']: os.remove(os.path.join(root, name)) ``` And then, copy the output of a cell to the clipboard ![image-20220903191455734](readme.assets/image-20220903191455734.png) I also deploy notebook in `mercury/img2lcd` as a web app. The deply guide is on https://zhuanlan.zhihu.com/p/561248459 ## epaper Image encoding principle: binarize eight consecutive pixels, and write the binarized 0, 1 string into a hexadecimal byte. ```c unsigned char gcs[1800]; int num = 0; char tmp[3]; char value[2]; void loop() { if (Serial.available()) { // read 3 bytes Serial.readBytes(tmp,3); for( int i = 0; i < 2; i++ ) { // ASCII to int:convert A~F value[i] = tmp[i]-65+10; if (value[i]<10){ // ASCII to int:convert 0~9 value[i] = tmp[i]-48; } } gcs[num] = value[0]*16+value[1]; num++; } if (num==1800){ EPD_Dis_MEM(65,160,gcs,120,120); //x,y,DATA,resolution 112*112 delay(100); num=0; } } void EPD_Dis_MEM(unsigned int x_start,unsigned int y_start,const unsigned char * datas,unsigned int PART_COLUMN,unsigned int PART_LINE) { unsigned int i; unsigned int x_end,y_start1,y_start2,y_end1,y_end2; x_start=x_start/8;// x_end=x_start+PART_LINE/8-1; y_start1=0; y_start2=y_start; if(y_start>=256) { y_start1=y_start2/256; y_start2=y_start2%256; } y_end1=0; y_end2=y_start+PART_COLUMN-1; if(y_end2>=256) { y_end1=y_end2/256; y_end2=y_end2%256; } Epaper_Write_Command(0x44); // set RAM x address start/end, in page 35 Epaper_Write_Data(x_start); // RAM x address start at 00h; Epaper_Write_Data(x_end); // RAM x address end at 0fh(15+1)*8->128 Epaper_Write_Command(0x45); // set RAM y address start/end, in page 35 Epaper_Write_Data(y_start2); // RAM y address start at 0127h; Epaper_Write_Data(y_start1); // RAM y address start at 0127h; Epaper_Write_Data(y_end2); // RAM y address end at 00h; Epaper_Write_Data(y_end1); // Epaper_Write_Command(0x4E); // set RAM x address count to 0; Epaper_Write_Data(x_start); Epaper_Write_Command(0x4F); // set RAM y address count to 0X127; Epaper_Write_Data(y_start2); Epaper_Write_Data(y_start1); Epaper_Write_Command(0x24); //Write Black and White image to RAM for(i=0;i