Some good progress has been made over the past few weeks waiting for the slow boat to deliver the prototypes – The tracking number’s finally changed, so 5 weeks after leaving the factory in Shenzen and they’re in Hong Kong.
I’ve been working on the main control PCB for the lights. Much helped by the guys on facebook and having some input from Phil Candy himself! (via Mike Cadwallader) –
I was struggling quite badly to figure out the distance between the LED inserts! – see the image below
Now, to the eye, all of the lines are evenly spaced, and using my Super mega (crappy Aldi) set of calipers, I was measuring different every time I tried…
Firing up some CAD software and doing a mega zoom calibration using the keyboard keys – I measured between 18.835mm and 19.06mm..A variance of 0.225mm. Not a massive amount by any means, BUT, i’m dealing with 0.6mm thick PCB’s here, mating to some type of slot in connector. A 0.2mm innacuracy in measurement would potentially mean a 0.4mm misalignment right from the start!
A quick question to the Spectrum Next Devs facebook group and The reply…
19.05mm Pitch. Yes.
With that little nugget of information, I’ve been able to accurately design the main by designing the hole centres for the inserts at 19.05mm spacing.
In the background, i’ve also been working on the code a little. The 3.3V arduinos have now arrived and i’ll be trialling the first actual spectrum Next connectivity soon!