Arduino MEGA 63 relay Web switch

This revision is from 2015/10/09 01:36. You can Restore it.

Web page

Circuit diagram(Edit)

Part list(Edit)

C1 capacitor 10u
R1-R63 resistor 1k
D1-D63 LED diode
U1-U8 ULN2803
Arduino short 29 pin
Arduino long 54 pin
JP1,JP2 jumper
P1,P2,P3,P4 header 2x10pin
Four distance spacers

✔ All components

❏ Solder all resistor on bottom side

❏ Solder all resistor on top side

❏ Next step is LED diode - necessary to observe polarity

❏ Solder all LED

❏ C1 capacitor

❏ Eight ULNs IO

❏ Short pin header on bottom side

❏ Long pin header on bottom side

❏ Four 20pin header and two jumper on top side

❏ Four distance spacers


for to run you need a six component:

  • Arduino mega
  • Arduino Ethernet shield
  • micro SD card
  • this Switch board
  • power supply (5V to USB or up to 12V in DC plug)
  • relay board controlled by grounded input


For beginners Getting Started with Arduino

You can configure firmware from master tree GitHub

Or download preconfigured version

config.cfg copy to microSD card and plug to Ethernet shield

.ino. file compile and upload to Arduino MEGA

Configure jumper(Edit)

  • JP1 - short disable auto reset from USB
  • JP2 - short connect power between Arduino DC input and power on Relay board - WARNING to maximum voltage Arduino Mega

Configure firmware(Edit)