Hehku 20

Hehku 20 · Clock display controller

Satellite-synchronised timekeeping for large pixel clock displays.

Hehku 20 is a controller for clock displays built from WS2815 pixel strips. It obtains the time from GNSS satellites and drives the pixels.

Enquire about Hehku 20How it works

Hehku 20 seen from the front: a light grey flat box with the Embedeon wordmark at the top left, a label recess, a row of status light windows at the top right, the name Hehku 20 engraved at the lower right, and mounting tabs above and below
Supply
12 VDC input
Display
about 1 mwide, about 300 LEDs
Pixels
WS281512 V, supplied separately
Current
6 Aat full white

How it works

  1. Time from satellites

    A GNSS receiver provides the date and time, and a real-time clock maintains it between fixes. An external active antenna connects to an SMA jack on the board.

  2. One chain of pixels

    The display has four digits of seven segments plus three extra segments, 31 in all. Each segment is a short run of WS2815 pixels, typically 10, and all segments share a single data line.

  3. Power through the board

    The 12 V supply feeds the strips through the board. The maximum draw is 6 A at full white, and the supply should be rated 7 to 8 A.

Features

External GNSS antenna

The SMA jack accepts an active antenna on a cable, so the antenna can be placed with a clear view of the sky.

Standard WS2815 strips

WS2815 strips run directly from the 12 V input. The strip density is about 96 LEDs per metre.

Supply input protection

The 12 V path includes reverse-polarity protection, a surge suppressor and an 8 A fuse.

Display size

A display 0.5 m wide has about 150 LEDs and draws about 3 A. Larger displays require power to be fed in along the display.

Specifications

Supply
12 V DC, up to 13.5 V
LEDs
WS2815 addressable pixels at 12 V, about 96 per metre
Display
Four digits of seven segments plus three extra, typically 10 LEDs per segment; about 1 m wide, about 300 LEDs
Current
6 A at full white (20 mA per LED); supply rated 7 to 8 A
LED connector
Four pins: 12 V, ground, data and backup data
Time
GNSS receiver with a real-time clock between fixes; external active antenna on an SMA jack
Environment
Indoor use
Scope
Controller box only; pixel strips are supplied separately

Hehku 20

Enquiries

Enquiries about applications and display sizes are welcome.

Contact Embedeoncontact@embedeon.com