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South West Makers (Australia)

SW Makers March 2018 Busselton Meeting

25/3/2018

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A quiet meeting.

Diane brought along some dresses she has made:
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Diane wanted to scan in all her fabric squares that people had drawn and written on at the 2017 Shenzhen Makers Faire:
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To do this, she used the Doc-Pi camera rig:
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And by closing the glass lid, automaticly kicked off the LEDs and photography process:
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Doc-Pi is a Raspberry Pi 2, Raspberry Pi Camera and Display  based system.  Below is a view of the electronics board and 3D printed stands from behind the RPi:
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Once the photo has been taken, a OpenCV based Python script locates the block edge:
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this can then be applied to the photo:
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Then the internal edges can be excluded:
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From the rough block edge outline, you can find each of the four corners (green box):
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Next the block image can be cut out, auto-rotated horizontal, resized and saved to a USB flash drive:
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A special voltage reference board was used to compare different multimeter's, across four different voltages.  The worst meter, was the $7.00 yellow meter, at 0.3%, with the best at 0.05% out.  Both are not too bad.
Picture
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