Bring Teensy reset button up to the Tympan

Tympan / Tympan_Rev_E_Hardware

Repository for Tympan Rev E Electronics and case designs

MIT License

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Bring Teensy reset button up to the Tympan #9

Closed eyuan-creare closed 3 years ago

eyuan-creare commented 3 years ago

In the existing enclosure, the battery obscures the reset button. If we brought the reset signal up to the Tympan, then we could place a second reset button in a better location. Likely, this would be a "side-press" button, but that is TBD.

Existing enclosure:

Teensy 4.1 Schematic showing the PROGO trace from the reset button:
Teensy 4.1 PCB showing the trace from the PROGO pin to the Reset Button. @chipaudette confirmed that this thru hole pin transitions LOW when the reset button is pressed

eyuan-creare commented 3 years ago

@biomurph looked into where the pin would fall:

Here is about the location of the pad that we would need to place for it.

The good news is that the pad for the pin next to it (pin 30) is not in the way. Also, there's enough room to either place a thru-hole, with a bunch of parts/trace juggling, or placement of a single SMT pad, with less parts/trace juggling.

There's also the option of flying a lead from the T 4.1 to the Tympan..

eyuan-creare commented 3 years ago

@biomurph suggested placing a momentary pushbutton (TL6340AF160Q) between the audio jacks:

This should work fine, though it is a tiny switch. The button is 1/32" tall. @chipaudette if you fine using a paper clip, I can put a guide hole in. If you would like a feature on the case with a cantilevered tab, then we should go bigger.

biomurph commented 3 years ago

possible candidate switches https://www.mouser.com/datasheet/2/910/909_2894_2893_DTSA-6-1571568.pdf The DTSA-6 drawing will fit and it is a decent size. There are tons of them.

eyuan-creare commented 3 years ago

Goldilocks says... that switch is just too big! It does fit, within the height of the stock headers but let me see it there is an alternative.

eyuan-creare commented 3 years ago

@biomurph What do you think of this switch? (faked up CAD model). It still feels a bit big but there is not much out there for RA switches.

APEM MJTP1117 ($.48 Digikey) SPST- NO

I'll cut a hole in the case so that the switch is set back from the outside. See the thin blue box below.

biomurph commented 3 years ago

Works great! Im down to use it. You have it overhanging the edge of the PCB. Is that how you want to?

eyuan-creare commented 3 years ago

@biomurph yes, please have the button overhang. Thanks!

biomurph commented 3 years ago

I placed the MJTP-117 push button between the audio jacks

chipaudette commented 3 years ago

@eyuan-creare , is this done? can we close this?