Feb 132016

Simple LED and switch project for Redfern Crumble board

This project uses:

1x Red LED

1x Push button switch

1x 270 ohm resistor

4x DuPont cables or croc-clip leads


flat short-legged side of the LED connects to the resistor & black wire.

resistor can be 220 ohm if you don’t have any 270 ohm.

The Crumble program waits until the button is pushed and turns the LED on for 5 seconds, then turns it off.


You program the Crumble by dragging blocks across from the left to the right

Try changing the program so the light only stays on for two seconds. Try changing the program so the LED flashes on and off twice.

Here’s how we power the Crumble


we soldered pin posts onto our Crumble board so we can use standard Arduino breadboard cables with it.

the Crumble board is sat on our 3D printed holder, which you can download from securipi.co.uk/crumble_crib.stl

 Posted by at 2:58 pm
Feb 092016

PocketPi is a portable Raspberry Pi Zero with a 5600mAh rechargeable battery and 4 port hub that you assemble yourself.


all combined into a 3D printed custom case that measures just 92mm x 42mm x 25mm & looks like this when complete


the boards are soldered together like this


and fit into the case like this


you use a hot-glue gun to fix the parts in place

full instructions can be found in our PDF, including buying links for each part here:

and here’s the STL file for 3D printing your own case and lid

You can edit the design of the case to add your own tweaks here:



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 Posted by at 7:02 pm