7x10 R click

7x10 R click can be used for displaying letters on display with 7x5 font resolution. It carries a matrix of 70 red LEDs driven by a pair of 8-bit serial-in, parallel-out shift registers, a Darlington Transistor array and a Johnson counter. 

7x10 R click is designed to run on either 3.3V or 5V power supply. It communicates with the target microcontroller over SPI interface, with additional functionality provided by the following pins on the mikroBUS™ line: AN, PWM, RST.

Essential features

7x5 is a standard resolution for displaying ASCII characters, so 7x10 click is essentially a dual-character display capable of showing letters in more readable typefaces compared to a 14-segment display. The dot matrix can also show scrolling text, thus fitting longer messages in small space.

The pair of 8-bit SIPO shift registers drive the display. The current amplification necessary for driving the LEDs is performed by a Darlington Transistor array while a Johnson counter performs the necessary LED multiplex.

SMD jumper

7x10 R click features an SMD jumper (zero-ohm resistor) that lets you switch between a 3.3V or a 5V power supply.

Specifications

Pinout diagram

This table shows how the pinout on 7x10 R click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
CD4017 clock pin	RC	1	AN	PWM	16	RR	CD4017 reset
74HC595 reset	MR	2	RST	INT	15	NC
Latch of 74HC595	CS	3	CS	TX	14	NC
SPI clock pin	SCK	4	SCK	RX	13	NC
SPI master in slave out pin for the MCU	MISO	5	MISO	SCL	12	NC
SPI master out slave in pin for the MCU	MOSI	6	MOSI	SDA	11	NC
Power supply	+3.3V	7	3.3V	5V	10	+5V	Power supply
Ground	GND	8	GND	GND	9	GND	Ground

Programming

Code examples for 7x10 R click, written for MikroElektronika hardware and compilers are available on Libstock.

Code snippet

This code snippet shows how to display scrolling text at medium speed.

01 void S7X10G_Task()
02 {
03     bool ind;
04     static bool called = false;
05     S7X10G_clearDisplay();
06
07     // scrolls given text
08     if ( !called )
09     {
10         S7X10G_drawText( " Mikro Elektronika" );
11         S7X10G_scrollEnable( S7X10G_SPEED_MED );
12         called = true;
13     }
14     do
15     {
16         ind = S7X10G_refreshDisplay();
17         S7X10G_tick();
18         Delay_ms( 10 );
19     } while( ind );
20     called = false;
21 }
22
23 void main()
24 {
25     systemInit();
26     while( 1 )
27     {
28         S7X10G_Task();
29     }
30 }