eINK click

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  • MIKROE-2659
  • MIKROE-2659
eINK click  is an adapter for connecting eINK displays, with a 24pin ribbon cable. The... more
Product information "eINK click"

eINK click is an adapter for connecting eINK displays, with a 24pin ribbon cable. The eINK display sold with the click can retain the image even when the power is off. The click board™ is designed to run on a 3.3V power supply. It communicates over SPI interface.

eINK displays 

The display uses electronic ink, which makes the display “Bistable”. It means that the display consumes power only when something is changing on the screen. This reduces the power consumption of the target device considerably. So, the display retains the image even when the power is off.

eINK displays have good sunlight readability, it's like you are reading something on real paper. It is the same type of display used in you ebook reader, like the Kindle™.

How the click works

The display communicates with the eINK click over SPI interface. The onboard LM75 temperature sensor is used for temperature calibration from the look-up table.

The click can be used with different eINK displays we plan to release in the future.

Display features 

The eINK display (EA EPA20-A) is a high-contrast e-paper display. It has a wide viewing angle and the resolution of 172X72 dots. The color of the display has four scales: black, dark gray, light gray, and white.

The power consumption, while the display is on, is around 40mW.


Type Electronic Paper Display
Applications Adding a display where low power consumption is necessary.
On-board modules LMA temperature sensor
Key Features The eINK displays retains an image even when the power is off
Interface GPIO,SPI
Input Voltage 3.3V
Compatibility mikroBUS
Click board size S (28.6 x 25.4 mm)

Pinout diagram

This table shows how the pinout on eINK click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

NotesPinMikrobus logo.pngPinNotes
  NC 1 AN PWM 16 D/C# Data/configuration
Reset RES# 2 RST INT 15 BUSY Busy indicator from the screen
SPI enable CS# 3 CS TX 14 NC  
SPI Clock SCK 4 SCK RX 13 NC  
  NC 5 MISO SCL 12 NC  
SPI data input SDI 6 MOSI SDA 11 NC  
Power supply +3.3V 7 3.3V 5V 10 NC  
Ground GND 8 GND GND 9 GND Ground


Code examples for eINK click, written for MikroElektronika hardware and compilers are available on Libstock.

Code snippet

This code snippet initializes the MCU and eINK click and in an endless loop displays black letters, white letters and external image, respectively.

01 void main()
02 {
03     sysinit();
04     eink_init();
05     Delay_ms( 1000 );
07     while( 1 )
08     {
09         // Display black letters on white background
10         eink_fill_screen( EINK_COLOR_WHITE );
11         eink_set_font( guiFont_Exo_2_Condensed21x32_Regular, EINK_COLOR_BLACK, FO_HORIZONTAL );
12         eink_text( "EINK", 14, 50 );
13         delay_ms( 3000 );
15         // Display white letters on black background
16         eink_fill_screen( EINK_COLOR_BLACK );
17         eink_set_font( guiFont_Exo_2_Condensed21x32_Regular, EINK_COLOR_WHITE, FO_HORIZONTAL );
18         eink_text( "EINK", 14, 50 );
19         Delay_ms( 3000 );
21         // Display external image
22         eink_image_bmp( _mikroe_bmp );
23         Delay_ms( 3000 );
24     }
25 }


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