Somewhere Over The Rainbow

This is blog post about making the ‘arena’ for the Something Over The Rainbow challenge.

The Bill:

9mm MDF 2440mm x 1220mm board – £16.80

Corner Brace 40mm – £7.74

3.5 x 12mm screws – £2.88

Blackboard paint – £5.90 (£11.60 as second coat was needed for removing grey quarter circles)

Art Attach PVA glue – kids had grown up sufficiently not to notice half is missing

Total: £33.32 (£39.32 – with second coat of paint)

Start of the build:

Ready for carrying it around:


Checking the size of the arena vs rover:


Sketching corners:


First, live test…


… has successfully passed – with a hamster!

Priming equipment:




Putting it all together:


Question: Grey corners or not?


First test of software coloured balls detection (happy path – almost no cheating):


(don’t get confused – camera is mounted at 90º CCW)

Update: Patience is a virtue… So mere couple of hours all was done:


So, here we go again – second coat of paint:


Grey quarter circles: now you see them – now you don’t!

And – over the weekend we discovered that screws on the bottom of the arena have bad habit of damaging furniture (i.e. dinning tables). So, here are finishing touches to address it:

Next step: coding!


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