WIFI002 - 2 Relays at 16A
The WIFI002 provides 2 volt free contact relay outputs with a current rating of up to 16Amp each, the module is powered from a 12vdc supply which can be regulated or unregulated. The DC input jack is 2.1mm with positive core polarity, DC supplies are required to supply at least 1A at 12vdc. The relays are SPCO (Single Pole Change Over) types. The normally open, normally closed and common pins are all available on the screw terminals.
The Relays on the WIFI002 can be controlled from the inputs on the WIFI484. This offers the opportunity to construct a system where an input can control an output anywhere on the earth provided both locations are connected to the network/internet.
-20C to +70C
The WIFI002 provides an LED to indicate each of the relay states and three for board status, these are:
Board power - red LED
WIFI connected - yellow LED
USB connected - green LED
Relay Power Rating
If the contact load voltage and current of the relay are in the region enclosed by the solid and dotted lines in the figure below, the relay can perform stable switching operation. If the relay is used at a voltage or current exceeding this region, the life of the contacts may be significantly shortened.
|load type||Typical applications||Rating||Max DC load capacity
|AC1|| Non inductive or
slightly inductive loads
|16A @ 250V AC|
|AC15|| Control of
| 3A @ 120V AC
1.5A @ 240V AC
|AC3||Control of motor||750W|
|DC1|| Non inductive or
slightly inductive loads
|16A @ 24V DC|
|DC13|| Control of electromagnetic
| 0.22A @ 120V DC
0.1A @ 250V DC
A full datasheet for the relays used on the WIFI002 is here: HF115FD datasheet
USB CONNECTOR AB MINI
16A Volt Free Contacts
Factory reset jumper
of the WIFI002
to your network
The WIFI002 is configured to connect to your network by means of a USB connection and configuration program.
For Windows the guide page and program is here
An Apple Mac version is also available here
And a Linux version here
Having plugged in your 12vdc power supply and Ethernet connection, start up your web browser and type http://WIFI002 into the address bar, please note this only works in windows. You will be prompted for a password as shown below:
|| The default login is:
The ability to change these
settings is shown in the
You should now see the following web page:
This web page will allow you to switch the relays on and off by clicking the relay buttons (the red/gray circles). It also contains a link to this technical documentation page.
By clicking the configuration link it's possible to configure the WIFI002 IP address and subnet mask together with the ability to set a password for entry to control screens.
The configuration page also offers the option to set a password that will be required to change any of the relay states or digital outputs using TCP IP commands, this is explained in the TCP/IP password section.
All settings are saved to memory so be careful to remember the username and password! Default password settings are shown in the picture below.
Should it be necessary to reset the WIFI008 to its shipped condition then there is a factory reset jumper, it is in the open position by default, if at power up it is moved to short the other end pin to the central pin a factory reset will be executed. The red LED will flash as the settings are reset, please wait until the LED finishes flashing and do not remove power during this period.
The firmware is fully updateable by re-flashing the board using our custom windows program. The updates currently available are:
V2 - 01/12/16 - Added numbering to relays in html pages
Using the Wifi module update:
First you need to connect to the board, the program will scan the local network and provide any boards in a list that it can see.
Next you will need to specify what port the board is located on, this will be 17494 unless you have changed it in the settings.
If there is a TCP/IP password the program will require it to be entered by clicking the password button.
Following a successful connection you will now be able to click the update button to select a file
Once the file has been opened the programming sequence will now begin, it's fairly short and following it's completion the board will reset (automatically) and the LED will flash quickly while the programming sequence completes. Do not turn the power off in this sequence.
WIFI002 Command Set
The command set designed to provide consistent expansion and new features, they are sent over TCP/IP on port 17494 (0x4456). This is the default port, it can be changed in the configuration settings.
Five connections are allowed at any one time, these are independently protected but all using the same password as defined in the board configuration.
|16||10||Get Module Info - returns 3 bytes. Module Id (26 for WIFI002), Hardware version, Firmware version.|
Digital Active - follow with 1-2 to set relay on, then a time for pulsed
output from 1-255 (100ms resolution) or 0 for permanent
Board will return 0 for success, 1 for failure
|33||21||Digital Inactive - follow with 1-2 to turn
relay off, then a time for pulsed output from 1-255 (100ms resolution) or
0 for permanent
Board will return 0 for success, 1 for failure
|35||23||Digital Set Outputs - follow with a single byte, first byte will set relays 1-2, All on = xxxxxx11 (0xFF), All off = xxxxxx00 (0x00), Board will return 0 for success, 1 for failure|
|36||24||Digital get outputs - sends a single byte back to the controller, bit high meaning the corresponding relay is powered|
|58||3A||ASCII text commands (V4+) - allows a text string to switch outputs, see section below|
|119||77||Get Serial Number - Returns the unique 6 byte MAC address of the module.|
|120||78||Get Volts - returns relay supply voltage as byte, 125 being 12.5V DC|
|121||79||Password Entry - see TCP/IP password|
|122||7A||Get Unlock Time - see section below|
|123||7B||Log Out - immediately re-enables TCP/IP password protection|
Digital Active/Inactive Commands
These are 3 byte commands:
The first byte is the command, 32 (active means on) or 33 (inactive).
Second byte is the relay number.
Third byte is the on time. Set this to zero for un-timed operation, or 1-255 for a pulse in 100mS intervals (100mS to 25.5 seconds).
0x20 - turn the relay on command
0x02 - relay 2
0x32 (50) - 5 seconds (50 * 100ms)
Board will return 0 for success, 1 for failure
Note - All bytes in a command must be sent in one TCP/IP packet.
If this option is enabled in the http configuration page then a password will be required to be entered before relay states can be changed. In the following example the password was set to "apple":
0x79 - 1st byte in frame sent to WIFI002 to indicate password entry
'a' (0x61) - 2nd byte in frame (ASCII hex equivalent in brackets, full table is available at http://www.asciitable.com/)
'p' (0x70) - 3rd byte in frame
'p' (0x70) - 4th byte in frame
'l' (0x6C) - 5th byte in frame
'e' (0x65) - 6th byte in frame
These 6 bytes are then transmitted in the same transaction to the WIFI002 and if the password is correct then 1 will transmitted back, a failure will send 2.
The board will now accept changes from the device that entered the password. If communication becomes idle for more than 30 seconds then the password protection is re-enabled. There is also a log-out command of 0x7B to enable the protection immediately.
Get Unlock Time
Returns TCP/IP password protection status:
0 - password protection is enabled and password entry is required before changes can be made
1 to 30 - seconds until TCP/IP password protection is re-enabled. All authorised commands set the timer back to 30 seconds (including this one).
255 - TCP/IP password is not enabled.
ASCII text commands DOA and DOI
Following customer request we have added a feature that allows the outputs to be switched using an ASCII string, devices like a Mobotix camera can now switch relays with simple strings.
The string for activating output1 for 5 seconds is formatted using comma seperated variables with the following syntax:
To break this down ":" (hex 3A) at the start of the string indicates that there is an ASCII message to follow, "DOA" is digital output active, "1" is the output number, then "50" for 5 seconds (50x100ms) and finally the TCP password (if applicable).
If I wanted to make output 2 inactive for 3 seconds I would use:
To break this down ":" (hex 3A) at the start of the string indicates that there is an ASCII message to follow, "DOI" is digital output inactive, "2" is the output number, then "30" for 3 seconds (30x100ms) and finally the TCP password (if applicable).
Assuming no password is used the previous command would simply be:
HTML commands DOAx and DOIx
Another customer requested feature, allowing the digital outputs to be switched by the http get function such as used in some voice over ip phones (VOIP). You can use the http get function to write to the io.cgi file with the following syntax:
This would use the default address (192.168.0.200) and make output 2 active for 1 second.
Another example would be to set output 1 inactive for 10 seconds:
You can test these functions by typing them directly into the address bar of most internet browsers. Also be aware that you may need to disable http authentication in the http configuration if your control device does not support it.
IP Addresses & DHCP Servers
The easiest way to use the WIFI002 is to connect it to a network with a DHCP server. In this case the WIFI002 will have its IP address assigned automatically by the DHCP server.
If there is no DHCP server on the network, then a fixed IP address of
192.168.0.200 is used. To control the WIFI002 using this fixed IP address
your computer MUST be on the same subnet.
The next step is to set your computers IP address to 192.168.0.x where x is in the range of 1 to 255 but not 200 (the WIFI002 is there!) or any other used IP addresses on the network.
The subnet mask dictates what IP addresses the PC can communicate with, we set this to 255.255.255.0 so the PC can talk to any module with an IP address of 192.168.0.x
Test program and example source code
To get the WIFI002 up and running in the minimum amount of time we have put together an example program to demonstrate the functionality of the module. We provide the full source code for this program. You may examine this code to see how it works or use it as a starting point for your own application.
Visual studio express C# examples
The test program is available as Visual C# express ready built installation files here, or as Visual C# express project with source files here.
Visual studio express is provided free from Microsoft: http://www.microsoft.com/exPress/download/
Access from the Internet (Port forwarding)
The WIFI002 can be controlled over the internet almost as easily as on your local network. Your network will most likely be connected to the internet with a broadband router. This will provide NAT (Network Address Translation) and Firewall services. To access the WIFI002 from the internet you will need to open up port 17494 (0x4456) to allow incoming TCP connections. Be careful not to open up any other ports. There are a wide variety of routers and we cannot give details for all of them. If in doubt ask your system administrator for assistance. The following shows how to open up a port on a Netgear WNR2200 router
When applied you should now be able to talk to the router over the internet at the IP address designated by your internet provider. When a data packet arrives on port 17494 the router will pass the packet on to the local address on the network (192.168.0.93) on port 17494.
To test this you will need a computer that has its own internet connection and is NOT connected to the same network as the WIFI002. Download and run the test program above and select Custom IP. In the pop-up box enter your routers internet facing IP address. Click on "Try IP" and it will connect you to the WIFI002 just as if it were on your own network.
Android & iPhone Apps.
We have a free app IO network available for Android and iPhone to remotely control your relays, download from Google Play or iTunes. Search for "Devantech" and you will find the app.