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C:\win32_executable>avrdude -cusbasp -Pusb -pm128 -v

avrdude: Version 6.3, compiled on Feb 17 2016 at 09:25:53

         Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/

         Copyright (c) 2007-2014 Joerg Wunsch

         System wide configuration file is "C:\win32_executable\avrdude.conf"

         Using Port                    : usb

         Using Programmer              : usbasp

avrdude: error: could not find USB device with vid=0x16c0 pid=0x5dc vendor='www.fischl.de' product='USBasp'

avrdude done.  Thank you.

C:\win32_executable>avrdude -cusbasp -Pusb -pm128 -v

avrdude: Version 6.3, compiled on Feb 17 2016 at 09:25:53

         Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/

         Copyright (c) 2007-2014 Joerg Wunsch

         System wide configuration file is "C:\win32_executable\avrdude.conf"

         Using Port                    : usb

         Using Programmer              : usbasp

         AVR Part                      : ATmega128

         Chip Erase delay              : 9000 us

         PAGEL                         : PD7

         BS2                           : PA0

         RESET disposition             : dedicated

         RETRY pulse                   : SCK

         serial program mode           : yes

         parallel program mode         : yes

         Timeout                       : 200

         StabDelay                     : 100

         CmdexeDelay                   : 25

         SyncLoops                     : 32

         ByteDelay                     : 0

         PollIndex                     : 3

         PollValue                     : 0x53

         Memory Detail                 :

                                  Block Poll               Page                       Polled

           Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack

           ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------

           eeprom         4    12    64    0 no       4096    8      0  9000  9000 0xff 0xff

           flash         33     6   128    0 yes    131072  256    512  4500  4500 0xff 0xff

           lfuse          0     0     0    0 no          1    0      0  9000  9000 0x00 0x00

           hfuse          0     0     0    0 no          1    0      0  9000  9000 0x00 0x00

           efuse          0     0     0    0 no          1    0      0  9000  9000 0x00 0x00

           lock           0     0     0    0 no          1    0      0  9000  9000 0x00 0x00

           calibration    0     0     0    0 no          4    0      0     0     0 0x00 0x00

           signature      0     0     0    0 no          3    0      0     0     0 0x00 0x00

         Programmer Type : usbasp

         Description     : USBasp, http://www.fischl.de/usbasp/

avrdude: auto set sck period (because given equals null)

avrdude: warning: cannot set sck period. please check for usbasp firmware update.

avrdude: error: program enable: target doesn't answer. 1

avrdude: initialization failed, rc=-1

         Double check connections and try again, or use -F to override

         this check.

avrdude done.  Thank you.

Installing the software

If the master is not a Raspberry Pi then just install ffmpeg or avconv on your machine. 

What you need

Firstly, you need to get a few things in order for your video wall to work and to avoid messing up your network. Here is the list of required hardware:

• A Yodeck player for each screen of the video wall
• Another Yodeck player (as “Master”) that will play back the actual content
• An HDMI-to-IP video streamer – we recommend Lenkeng LKV373A (sender only, costs about $36)
• A Network router – no special specs, just having a LAN and a WAN port will do
• One Network switch to connect all of the above 

The Raspberry Pi is equipped with one SPI bus that has 2 chip selects. 

Unfortunately, there is no schematic, however wiring is pretty simple:

LCD0      - RPi

SDO(MISO) - MISO/GPIO9, pin21 (common)

LED       - 5V through 1k resistor, pin 2 (common)

SCK       - CLK/GPIO11, pin23 (common)

SDI(MOSI) - MOSI/GPIO10, pin19 (common)

D/C       - GPIO24, pin18

RESET     - GPIO25, pin22

CS        - CE0/GPIO8, pin24

GND       - GND, pin 6 (common)

VCC       - 3.3V, pin 1 (common)

LCD1      - RPi

SDO(MISO) - MISO/GPIO9, pin21 (common)

LED       - 5V through 1k resistor, pin 2 (common)

SCK       - CLK/GPIO11, pin23 (common)

SDI(MOSI) - MOSI/GPIO10, pin19 (common)

D/C       - GPIO18, pin12

RESET     - GPIO23, pin16

CS        - CE1/GPIO7, pin26

GND       - GND, pin 6 (common)

VCC       - 3.3V, pin 1 (common) 

[  183.443734] usb 1-1.4: Product: USB2.0-Serial

[  183.444729] usb 1-1.4: can't set config #1, error -32

[  183.523097] usb 1-1.4: USB disconnect, device number 15

[  183.820540] usb 1-1.4: new full-speed USB device number 16 using dwc_otg

[  183.953830] usb 1-1.4: New USB device found, idVendor=1a86, idProduct=7523

[  183.953846] usb 1-1.4: New USB device strings: Mfr=0, Product=2, SerialNumber=0

digitalWrite(RELAY1,LOW); // Turns ON Relays 1

Serial.println("Light ON");

delay(2000); // Wait 2 seconds

digitalWrite(RELAY1,HIGH); // Turns Relay Off

Serial.println("Light OFF");

delay(2000); 

A접점(arbeit contact)은 전기적으로 릴레이에 전류가 흐르면 동작하여 닫히는(ON) 접점

(normally open contact). 

B접점(break contact)은 전기전으로 릴레이에 전류가 흐르면 동작하여 접점이 열리는(OFF) 접점.

상시폐접점(normally closed contact).

C접점(change-over contact)은 a, b접점부를 공유, 트랜스퍼 접점(transfer contact) 이라고도 함.

A접점=NO(Normally open)

B접점=NC(Normally closed)

C접점=Transfer contact