1. Connect

The software running on both the emonPi and emonBase SD card is the same. We have created a pre-built image which we call emonSD with everything in place to support both local and remote data logging with Emoncms.

This guide walks through connecting an emonPi or emonBase running the emonSD software to your local network or/and the wider internet with either WiFi, Ethernet or 3G GSM Dongle. If you do not wish to connect to a network it is also possible to access the emonPi and emonBase user interface in stand-alone access point mode.

If you are building your own RaspberryPi base station the emonSD image is available to download here: Pre-build SD card download & Change Log. The SD card can also be purchased from the shop.

  1. Connecting via Ethernet
  2. Connecting via Wifi
  3. Connect to Ethernet and then configure Wifi

Option 1: Connecting via Ethernet

Where possible we recommend connecting via Ethernet for best reliability and ease of setup. To ensure that your emonPi/emonBase does not start a WiFi access point on first boot, connect up the Ethernet cable between the emonPi/emonBase and internet router first and then power up the unit.

emonPi First Boot Ethernet

Note to self-build users: To ensure that the Pi has enough power a 2.0A USB power adapter is recommended, 2.5A ideal.

emonPi: The LCD display will display the firmware version then scan for connected sensors. Once the Raspberry Pi has booted up, the LCD will display the IP address of the emonPi on the local network:

Take care to connect the Ethernet to the socket on the same side as the USB sockets, not the RJ45 connector on the opposite side.

emonBase: Without the LCD Display we have to rely on either the hostname or network discovery tools to find the EmonBase on the network. Try browsing to the hostname: http://emonpi, http://emonpi.local or http://emonpi.lan.

You should now see the emoncms user login page. Register a new account and then continue to the next step Log Locally to configure your system.

If the hostname does not work, it is usually possible to find a list of devices and their IP address’s on your internet router. Alternatively Network Discovery tools such as Fing work well. Download Fing Android or Fing iOS.

UPDATE HIGHLY RECOMMENDED: Now your emonPi/emonBase is connected to a network this would be a good time to pull in any new updates: Setup > Admin > Update

Option 2: Connecting via WiFi

emonPi WiFi

Note: Please be patient, it can take a number of minutes to start broadcasting an a WiFi AP at startup. The LCD will display WiFi: YES 0% once the WiFi AP is active.

emonpi wiki connect


  • Follow setup wizard to connect to local WiFi network:

Note: If required emonPi can operate in Wifi AP mode without any network connection. If operating in AP mode use of a RTC (real-time-clock) is highly recommended to keep system time.


Please be patient, scanning for networks can take a while


  • After selecting local WiFi network and entering password the emonPi will turn off its own WiFi AP then reboot and try and connect to local WiFi network.

Note: if connection fails e.g. incorrect password, follow instructions 1b to connect temporary via Ethernet and use the Emoncms WiFi setup as detailed in step 4


  • After a couple of minutes attempt to connect to your emonPi/emonBase via it’s hostname: http://emonpi, http://emonpi.local or http://emonpi.lan.

  • emonPi: If hostname does not work on your network, enter the IP address shown on the LCD into your browsers address bar
  • If using an emonBase and hostname does not work, look up its IP address from your router or use the Fing Network Discovery tool on Android and iOS.

You should now see the emoncms user login page. Register a new account and then continue to the next step Log Locally to configure your system.

Option 3: Connect to Ethernet and then configure Wifi

An alternative approach to WiFi setup is to connect first using Ethernet and then use the Emoncms WiFi module to configure the WiFi connection. Start by following the Ethernet steps above. Create an emoncms account, login and navigate to Setup > WiFi:

Network scan should happen automatically and show the available WiFi networks:

Connect to Wifi

Check the box to select the network(s) you want to connect to. Enter the PSK password and then click Save and Connect.

After a few seconds ‘Connection Info’ should refresh automatically to report Status: Connected and after a few more seconds the IP address should appear.

Advanced: Assign static IP