The HawkEYE PLUS builds on the monitoring and control functions of the HawkEYE by adding a Raspberry Pi 3b and a 1.8" TFT display. This great little Linux based computer can communicate with the frequency monitor and the display using SPI communications.

The Pi's Ethernet adapter is made available using the network port on the back of the HawEYE PLUS. It is possible to program the Pi using any language you prefer (Python is recommended).

There is a full tutorial on reading the frequency and relay status from the frequency monitor and writing those values to the TFT screen.

The case

Front panel

The front panel of the HawkEYE PLUS contains a 1.8 inch TFT display (160 pixels wide x 128 pixels high). This display is controlled by the built in Raspberry Pi and therefore can be customised by you. The 3 Relay indicators illuminate when the frequency drops below the related thresholds and at the same time make a connection to the device connected to the rear of the HawykEYE PLUS. These frequencies are hard-coded into the HawkEYE PLUS and are active whether the Raspberry Pi is functioning or not.

Back panel

The rear panel of the HawkEYE PLUS contains the 3 connection points for devices you want to control from the frequency changes. Next there is a RJ45 Ethernet port connected directly to the Raspberry Pi. The Power plug is for the supplied 12V AC 1600 mA. It is from this power supply that HawkEYE PLUS measures the frequency so please only use the supplied power supply. Finally there is an earth connection point for the case of the HawkEYE PLUS. This must be connected to the electrical earth of you power supply if you are switching mains AC voltage through any of the relays. 


The HawkEYE PLUS package includes the following items:

  • 1 x HawkEYE PLUS (Includes Raspberry Pi 3B and pre-installed 32GB microSD card)
  • 1 x 12V AC 1600mA Power adapter
  • 3 x Relay connectors
  • 4 x Rack mounting cage nuts
  • 4 x Rack mounting bolts