7ColorEPaperPhotoFrame

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7ColorEPaperPhotoFrame

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Battery operate photo frame using the 7 color 5.65 inch e-paper display from Waveshare

// repository documentation

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# Seven color e-paper photo frame
Battery operated photo frame using the [Advanced Color ePaper (ACeP™) display from Waveshare](https://www.waveshare.com/wiki/5.65inch_e-Paper_Module_(F)). The display has seven colors and measure 5.56 inch, 600 by 448 pixels. Overall dimensions: 125.4 x 99.5 x 9mm (WxHxD, depth includes header and display). Display usable area dimensions: 114.9 x 85.8mm (WxH). The images are preprocessed using [Floyd-Steinberg dithering](https://www.waveshare.com/wiki/E-Paper_Floyd-Steinberg) to reduce to 7 colors and still have a reasonable quality and stored on a SD-card. An Arduino is used to read from the SD-card and write to the display. [lenna.bmp](https://github.com/robertmoro/7ColorEPaperPhotoFrame/blob/main/lenna.bmp) is a ready to use example image.

## BOM
- [7 Color ePaper display](https://www.waveshare.com/wiki/5.65inch_e-Paper_Module_(F))
- Arduino pro-mini
- SD card reader (images storage)
- LDR (to not change the image in the dark)
- N-channel MOS FET (for example AO3402) (to switch off the SD card reader)
- 2x AA of 2x AAA battery holder 
- [3.3 volt mini boost converter](https://www.ebay.com/itm/282029936915?hash=item41aa4b5113:g:iCQAAOSwlR9a22vT) (power supply)
- Capacitor 220uF or bigger (power supply filter)
- Capacitor 100nF (power supply filter)
- [3D printed frame](https://www.thingiverse.com/thing:4879693)

To make the Adruino and SD card reader low power, remove the voltage regulator.

## Wire up the Display, and SD-card reader to the Arduino (Uno / Nano / Pro-Mini)
Pins Arduino <=> SD Card module
- 10 - CS / SS
- 11 - MOSI / DI
- 12 - MISO / DO
- 13 - SCK / CLK
- GND - GND
- Vcc - 3.3V

Pins Arduino <=> 7 color e-paper display
- 7 - BUSY
- 8 - RST
- 9 - DC
- 6 - CS
- 13 - CLK
- 11 - DIN
- GND - GND
- Vcc - 3.3V

## Prepare the images using Gimp
Start [GIMP](https://www.gimp.org/) and drag the image to be processed into the application.

### Create a seven color palette
Use the palette editor to create a seven color palette
|  |Color		|Bin		|Hex|R,G,B				|
|---|-------|-------|-----|-----------|
|1. |Black 	|0b000	|0x0	|0,0,0			|
|2. |White	|0b001	|0x1	|255,255,255|
|3. |Green	|0b010	|0x2	|0,255,0		|
|4. |Blue		|0b011	|0x3	|0,0,255		|
|5. |Red		|0b100	|0x4	|255,0,0		|
|6. |Yellow	|0b101	|0x5	|255,255,0	|
|7. |Orange	|0b110	|0x6	|255,128,0	|

![GIMP Palette Editor](https://raw.githubusercontent.com/robertmoro/7ColorEPaperPhotoFrame/main/DocumentationImages/GimpPaletteEditor.png)<br/>
*GIMP Palatte Editor dialog*
  
### Rearrange the colormap
Make sure that the colors are arranged in the correct order in the Rearrange Colormap dialog.<br/>
Main menu or right click image and select
- Colors >
- Map >
- Rearrange Colormap...
- Make sure the colors are ordered as mentioned above in the color palette or the image below, and select OK

![Gimp Palette Editor](https://raw.githubusercontent.com/robertmoro/7ColorEPaperPhotoFrame/main/DocumentationImages/GimpRearrangeColormap.png)<br/>
*Rearrange Colormap dialog*

### Resize and crop
Resize to 600 width or 448 height so an 600 by 448 image can be cropped.

#### Resize
Main menu / right click image and select
- Image >
- Scale Image...
- Provide width and or height
- Select Scale to apply the selection

#### Crop
'Shift + C' or main menu / right click image and select 
- Tools >
- Transform Tools >
- Crop (Shift + C)
- Use mouse and or size and position fields
- Select Enter to apply the crop or Esc to leave the Crop menu

### Dither
Main menu / right click image and select
- Image >
- Mode >
- Indexed...
- Use custom pallete
- Select the created 7 color palette
- Select Floyd-Steinberg for Color dithering
- Select Convert

### Export as BMP
'Shift + Ctrl + E' or main menu / right click image and select
- File
- Export as (Shift + Ctrl + E)
- Type a filename and give it the bmp extension
- Deselect 'run-length encoding'
- Under 'Compatibility options' select 'Do not write color space information'
- Select Export

![GIMP Palette Editor](https://raw.githubusercontent.com/robertmoro/7ColorEPaperPhotoFrame/main/DocumentationImages/GimpExportImage.png)<br/>
*GIMP Export Image as BMP dialog*

7ColorEPaperPhotoFrame

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