Two of my family attended Coldplay’s Head Full of Dreams Tour at Wembley this weekend and returned home with their high-tech wristbands that apparently glowed and flashed in rythm to the music. Only when outside the stadium they stopped working and haven’t flashed again since.
Searching the internet would imply the wristbands are made by a company called Xyloband (see their fantastic website at www.xylobandsusa.com to see their latest products) and although many of the articles were related to circa 2012 there is nothing to suggest the new variants are hugely different.
The bands appear to have a RF receiver that is centred on 869.5MHz (SRD860 band) .
I need something like this below (from Maplin):
Now, I wonder what protocol was used ? It will be something fairly simply I bet, with simplex transmission (who’d want info coming back from 75,000 of these !). What would the lights do – so I just asked the question indoors and was told “I don’t know…white, red, yellow”. So the new bands are RGB so lets assume they have a minimal 3 bit code with each bit being for one of the primary colours. To sync that we’d also need a start bit.
For now I’ll order the Tx module. Then I’ll run it and modulate the output with the most simple binary Frequency Shift Keying ( FSK) (eg on/off). I’ll run through a few pulse widths starting at about 100us and moving up to 100ms. The comms is probably not too tight as multipath off the stadium structure would soon distort the signal.
Once I get also get the back off the Xyloband I can probe the ICs inside to determine what is actually having an effect.
Keep you updated on progress…..
This is only one of a series of blogs investigating my Xyloband; please see my other blog pages for Xyloband Hacking (click here or use the Xyloband tag further down the page).
My WordPress homepage is at https://roddersblog.wordpress.com/
[Edited on 29th Nov 2016 to include URL to XylobandsUSA]