2.2.1. Connect to your Red Pitaya

Red Pitaya STEMlab boards are network attachable devices focused on simple connectivity and quick accessibility. Having a graphical user interface for your Oscilloscope, Signal Generator, LCR meter and other Red Pitaya applications, directly on your PC without any limitations such are limited commands or controls or any installation of additional software will provide you with a unique working experience.

Red Pitaya STEMlab boards can be connected over:

  1. Local Area Network (LAN) - Requires a DHCP server on your LAN router
  2. Direct Ethernet cable connection - Requires additional setting on users PC and STEMlab board
  3. Wireless Network client - Requires an additional WiFi dongle available at Red Pitaya store
  4. Access Point Mode - STEMlab board creates its own WiFi network
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2.2.1.1. Wired

2.2.1.1.1. Local Area Network (LAN)

This is the most common and recommended way of connecting and using your Red Pitaya STEMlab boards. Your LAN network needs to have DHCP settings enabled which is the case in majority of the local networks, with this, simple plug and play approach is enabled. Having STEMlab board connected the local network will enable quick access to all Red Pitaya applications using only your web browser. Simply follow this 3 simple steps:

  1. Connect power supply to the Red Pitaya STEMlab board
  2. Connect STEMlab board to the router or direc to the PC Ethernet socket
  3. Open your web browser and in the URL filed type: rp-xxxxxx.local/

Note

xxxxxx are the last 6 characters from MAC address of your STEMlab board. MAC address is written on the Ethernet connector.

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Figure 1: Connecting your STEMlab board to the LAN network.

After the third step you will get a Red Pitaya STEMlab main page as shown below.

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Figure 2: STEMlab main page user interface.

2.2.1.1.2. Direct Ethernet cable connection

If there are some restrictions for the user to have STEMlab boards on the DHCP LAN network permanently there is a possibility to directly connect to your STEMlab board.

Direct Ethernet Connection was enabled from the start but until now some additional settings on the user’s PC (static IP configuration) were necessary in order to set connection correctly. This step has been eliminated with the NEW OS 0.97 (and newer) and the only step needed is to plug the ethernet cable from your PC to the STEMlab board.

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Here is the procedure for Direct Ethernet Connection

Windows 7,8,10 (the Bonjour service must be installed for Win 7/8)

  1. Connect the ethernet cable and wait 30 sec
  2. Open the web browser and type rp-xxxxxx.local/ in the URL field

Linux / Ubuntu

  1. Open Network settings, Edit Connection and for LAN network under IPv4 Settings select Method Share to other computers
  2. Connect the ethernet cable and wait 30 sec
  3. Open the web browser and type rp-xxxxxx.local/ in the URL field

MAC

  1. Connect the ethernet cable and wait 30 sec
  2. Open the web browser and type rp-xxxxxx.local/ in the URL field

Note

xxxxxx - last 6 chracters from the MAC address (on the ethernet connector)

Warning

If you experience some problem when using Direct Ethernet Connection described above, try to *disable WiFi* connection on *your PC* (if it has been enabled) and *reset the STEMlab* board(power off/on). If the problem still persist you can try STATIC IP configuration described below.

Static IP configuration

This type of connection requires additional settings on your PC and STEMlab board.

Note

This connection is also arranged via Network manager application so users should first have access to the LAN (DHCP) network in order to arrange static IP on the STEMlab board.

How to set direct Ethernet connection is described bellow.

First step in connecting STEMlab board directly to LAN network and setting a static IP on it.

  1. Use recommended connection described in Local Area Network (LAN) section. Once you are successfully connected to your STEMlab board, open Network Manager and chose Static option. Input the static IP and click Apply.

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  2. Second step is to set a network setting on the PC. Here we give an example on the Ubuntu 14.04 but it is very similar on the other OS also. To set a direct connection with your PC follow next steps:

    1. Open network manager on your PC
    2. Add new Ethernet connection (There is no need to create new network since you can set static IP settings on the existing network and skip all steps up to step 5.)
    ../../_images/connect-12.png
  3. Select Ethernet connection and press Create button

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  4. Select the name of the new Ethernet connections

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  5. Select Method – Manual, Press Add button and insert:

    • static IP address of your PC (must be different from the IP address of the STEMlab board),
    • Netmask (input: 255.255.255.0)
    • Getaway (can be left empty)
    • DNS servers (can be left empty) and click Save button.
    ../../_images/connect-15.png

Note

Once you have this settings arranged, connect Ethernet cable between your STEMlab board and PC, open web browser, in the web browser URL field input chosen STEMlab board static IP (in our example 192.168.0.15) and press enter.

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2.2.1.2. Wireless

2.2.1.2.1. Wireless Network Connection

This type of the connection will enable wireless connection to the Red Pitaya STEMlab board via your local WiFi network. In order to connect your STEMlab board to the same WiFi network on which you have connected your PC/Laptop first you need to use LAN connection. Access your STEMlab board via web browser and start Network Manager application. Trough this application all network settings of the STEMlab board are manageable. Simply select the desired WiFi network, input password and select connect. Once you have arranged WiFi network you don’t need LAN connection anymore and after the restart of the STEMlab board it will connect to the preset WiFi network automatically.

Note

Connecting the STEMlab via WiFi network the additional WiFi dongle is needed. WiFi dongle is available here [Link to RS or similar].

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Steps on how to connect your STEMlab board over WiFi network are described bellow:

  1. Start your STEMlab web user interface (Use connection described in Local Area Network (LAN) connection)

  2. Open Network Manager application

  3. Insert WiFi dongle in the USB plug on the STEMlab board. Recommended WIFI USB dongle is Edimax EW7811Un. In general all WIFI USB dongles that use RTL8188CUS chipset should work.

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  4. When the USB WiFi dongle is plugged in, the system will recognize it and enabled additional settings.

  5. Select Client Mode, Desired WiFi network, Insert password and click Connect.

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  6. When your STEMlab board is connected the IP address will be shown on the user interface. This IP address is only for WiFi connection. You can check the connection by inputting a WiFi IP address in the web browser URL field (press enter after inputting).

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Now you have WiFi connection established. If you restart STEMlab board it will connect to selected network automatically (if selected network is available). Also you can disconnect LAN connection and your board will be still available over the WiFi network i.e WiFi IP address.

Note

WiFi networks are generally not robust and the full performances of the Red Pitaya application can be affected.

Note

When using Raspberry Pi WiFi dongle, an issue of the dongle not being detected can arise. To mitigate, detatch the power cable from Red Pitaya and wait for about a minute before powering up the Red Pitaya again.

2.2.1.2.2. Access Point mode

When there are no LAN or WiFi networks available, STEMlab can act as an access point. This will allow you to connect your PC/Laptop, Tablet or smart phone to the STEMlab directly over WiFi.

Note

To use STEMlab as an access point a Raspberry Pi USB WiFi dongle is needed.

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Follow the steps bellow to enable Access Point and connect to it.

  1. Start your STEMlab web user interface (Use connection described Local Area Network (LAN) connection)
  2. Open Network Manager application
  3. Input the name and password of the Access Point network to be created (Password name should be at least 8 characters long. Do not use special signs.)
  4. Connect your PC/Laptop/Tablet/Phone to the network created by STEMlab board.
  5. Input Access Point network IP address to the web browser URL field and press enter.

Note

When Access Point is enabled on STEMlab, it will continue to boot in Access Point configuration, untill it is disabled in the Network Manager.

Note

IP address in Access Point mode is always the same: 192.168.128.1

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