Dec 062013

This is a prototype for a project with an Austrian partner, with a rotary switch mounted inside a pi3g case. We are able to provide custom machining on our custom cases, and assembly services. Please contact us if you are interested.


Case closed, rotary switch is mounted. The opening had to be enlarged for a good fit of the switch. A plastic ridge on the top of the switch base was in the way.


A view from the inside – the switch is mounted with glue in this prototype.


The opened case from above. This is a stock Raspberry Pi Mod B 512 MB.

Rotary switch

The rotary switch is order number 1123676 from Farnell (Lorlin, PT6509/BMH rotary switch with three poles and positions). It will fit in exactly one position into the TEKO/pi3g Raspberry Pi case, which is shown above.

As already stated, the opening had to be extended to allow space for the plastic ridge. It is about 2 / 3 of the thickness of the case at this point, making a machining in steps (accomodating the ridge inside the case, hidden from view) impracticable. This is, because the case would be too thin at this point for attaching the switch with a nut.

Thermic implications

We tested with “stress” (stress –cpu 5 –io 5 –vm 5 –vm-bytes 10M –timeout 360000s).


As you can see, the temperature inside the case stays below 45 ° C at 20 ° C ambient temperature, even under high load. Thus, the rotary switch does not adversely impact the Raspberry Pi’s performance. (Processor auto-regulation by the Raspberry Pi begins at 60 ° C AFAIK).

Further research

We recommend further research on Mouser, RS and Digikey to look for a better-fitting option, whích will require less space in the case and less machining / finishing. For a hobby project this rotary switch might be a good option, though.

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