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Simple Wireless Display using Ciseco RFu-328

The Idea

For a while I’ve been tinkering with the Ciseco RFu-328 Arduino compatible wireless module but hadn’t done much with one. I’d obtained a pair of 1.8″ SPI TFT displays via an eBay seller in China that I had previously used with Arduino and mbed modules. The displays are driven using the Adafruit ST7735 library. I built a quick prototype and was able to test the basic LCD software. I then decided to go for a proper PCB design based on my recent experience designing PCBs using EagleCAD.

The remote sensors I was using are all base don the Ciseco SRF radio modules using the LLAP protocol described at

The PCB was manufactured in the UK by


The features I wanted to include were:

  • Compact design
  • Battery powered
  • Over the air programming – No cables!
  • Mini Joystick for control – Eagle footprint available in Sparkfun library
  • Additional PWM or NeoPixel outputs for indicators
  • Software should display nodes and the values they send
  • Include timer to remove nodes that dont respond after a certain time
  • Display receive battery voltages, if nodes support it

Build and use pictures

2013-09-03 12.05.11

2013-09-03 17.28.58

A quick trial fit of the display and spacers Starting to populate the board
2013-09-03 17.11.12

2013-09-03 17.05.41
More components and headers added Working display

EagleCAD files

Files are available from SolderPad.


This is the early stages of this project, future plans include:

  • Use joystick to navigate menus for setup and control
  • Be able to send LLAP commands for control of relay boards
  • Use as a range tester for mapping signal strength around a building

More to follow….

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