relay controller with web interface

Product of: B2Data Kft. (Ltd.)
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relay controller with web interface

Control relays through the Internet or LAN
  • with a browser manually
  • or with the programming API
With relaydroid devices you can create a smart switch for any purpose.
You can use the internal web interface or you can control relaydroid from your own program through the programming API.
Many interfaces
  • 10Mbit wired RJ-45 Ethernet port for network communication
  • open-collector outputs to control relays
  • digital inputs to detect the state of external switches
  • analog inputs to mesure the voltage of attached DC circuits
  • COM port for remote serial communication

Different versions for different purpose

  • relaydroid-3R: 3 open collector outputs
  • relaydroid-6R: 6 open collector outputs
  • relaydroid-9R: 9 open collector outputs
  • relaydroid-18R: 18 open collector outputs (35mm wide case)
  • relaydroid-21R: 21 open collector outputs (35mm wide case)
  • relaydroid-3D: 3 digital inputs
  • relaydroid-6D: 6 digital inputs
  • relaydroid-9D: 9 digital inputs
  • relaydroid-21D: 21 digital inputs
  • relaydroid-3R3D: 3 open collector outputs, 3 digital inputs
  • relaydroid-3R3A: 3 open collector outputs, 3 analog inputs
  • relaydroid-3R3D3A: 3 open collector outputs, 3 digital inputs, 3 analog inputs
  • relaydroid-3R+COM: 3 open collector outputs and RX/TX pins for remote serial communication
FRONT-LAN and SIDE-LAN versions

Web-based user interface

Web user interface on a PC
browser interface
Web user interface on a smartphone
smartphone screen
Control relays with a web-based user interface
through LAN or Internet
  • with a mobile phone (embedded browser)
  • with a PC browser (IE, Firefox, Chrome, Opera, etc.)
Embedded webserver
  • access from browser, no apps needed
  • multilingual user interface (eng, hun)
Fully configurable
  • fix IP or DHCP client
  • changeable MAC address
  • NetBios name
  • multiple login users (username, password, privileges)
  • User Manual (pdf)

'State of the art' electrical design

Microcontroller based core
  • low power consumption (< 1W)
  • high reliability
  • long life
Custom core firmware
  • very fast startup time (< 1sec)
  • remotely upgradable
Industrial grade
  • high quality parts
  • precise production
  • fully tested to meet standards
relaydroid parts
high quality parts
precise production
precise production

DIN rail holder

DIN rail mount
relaydroid-3R BOX KIT
DIN rail case
  • easy installation in distribution boards
  • compact size, only 17.5mm wide
LAN connector orientation:

Special functions

Many implemented network protocols
  • TCP/IP, UDP, HTTP, NTP, NetBios, DHCP, DNS, ICMP (PING), SMTP (email)
Programmer API for custom solutions Digital inputs
  • can be used as impulse switches to control the local or remote relays
  • send status emails at the change of the inputs
  • send status to remote server or another relaydroid
PING remote servers
  • switch a relay if there is no response in the given time

Application examples

Intelligent home solutions
  • control garage doors and gates (impulse switch)
  • switch lights on/off (bistable switch)
  • switch heating on/off (timer switch)
  • control roll-up blinds (two-way switch)
Industrial solutions
  • control machines with serial input (remote serial terminal)
  • copy relay states to a remote relay (pair-up two or more relaydroid)
  • copy button states to a remote relay or server
  • send alarms at input changes


  • Wide input power range
    • 8-28V DC input (the power adapter is not included)
    • compatible with 12V and 24V relays (the relays are not included)
  • OC output states are stored in non-volatile memory (in case of power failure)
  • it is possible to control several relaydroid devices simultaneously from a PC software, with a calendar-like automatic scheduling, e.g. on Monday 10:00 AM + Tuesday 12:30 PM and 1:00 PM (relaydroid-controller software)
  • custom functions can be implemented
    • it is possible to use symmetric-key AES encryption or MD5 signature in the communication API1
    • it is possible to connect several devices to an Internet cloud server and control all devices from one place1
    • 1: please ask for these special functions at the time of order!
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Product of: B2Data Kft. (Ltd.)
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B2Data Kft.