Sports Timing TransponderBlind

in Wearables Design held by MobiiSystems
Contest Ended, Winner(s) have been selected.
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Description:
We have designed a 2.4 GHz transponder that is used for sports timing. We require a plastic housing to be designed for this small wearable device.

The PCB has a solar cell on one side and a small 40 mAh LiPo battery on the other.

The transponder is used in running, cycling and Triathlon type events, so we need it to be completely waterproof, we prefer that the unit is ultrasonically welded to form a hermetically sealed product.

The transponder will need to worn by runners, attached to bicycle forks, attached onto ankle straps, etc. An approach we would like to take with the design is to allow for the transponder itself to have a minimalistic design with a universal mounting option that allows for it to be attached to a separately designed Bike mount, or wrist strap.

Ie: the Bike Mount would be a separate design that cable ties (zip ties) to the front fork of a bicycle, then the transponder clips onto or locks into the bike mount. This would allow for future designed mounting accessories, while keeping the transponder design standard.

The design considerations include:

- The housing must be completely waterproof (Hermetically sealed). We would prefer that the unit is sealed with ultrasonic welding.

- We use a solar cell on the top of the PCB to charge the small LiPo battery, so there should be a transparent section in the housing to allow for light to reach the solar cell so that the LiPo remains charged.

I have attached an image of the transponder as well as an STL file of the PCB Assembly. We can send further information and output files as required.
Wants:
The design needs to be:

- Compact
- Waterproof (parts need to be designed for Ultrasonic welding)
- Universal mounting design to allow the transponder to clip or lock into separately designed mounts in the future.
Software:
  1. SolidWorks

Entries

= Buyer's Rating
#15 Rev 3 by Jim81
May 18, 2019 16:11
#9 New I.D. by Jim81
May 18, 2019 12:21
#3 Transponder 2.0 by Jim81
May 17, 2019 13:41
#7 Sports Timing Transponder design concept (A) by Thommy
May 17, 2019 23:37
#1 Transponder by Jim81
May 16, 2019 22:21
#4 transponder by gikam
May 17, 2019 15:50
#8 transponder case apart by gikam
May 18, 2019 9:14
#11 Sports Timing Transponder - Hafiz mk1 by Endoxos
May 18, 2019 14:47
#12 Sports Timing Transponder design concept B by Thommy
May 18, 2019 14:50

Discussion

Showing last 20 comments - View All

MobiiSystems

Buyer

Sat, 18 May 2019 09:21:20 +0000
Hi Everyone

I have attached an image "concept" to the contest to better describe my comments below and provide more clear design direction.
Please excuse the terrible drawing from my touchscreen, but I hope that this will help explain it better.

Thank you.

MobiiSystems

Buyer

Sat, 18 May 2019 07:03:49 +0000
Hi Everyone

Some feedback from the team so far, hope this will help narrow down the design:

- Preferably, the top half of the housing where the solar cell is located, should be a single part that is transparent (ie: no separate window design). We may apply a spark finish to the inside of the lid to conceal the PCB and allow light to pass. We can then print on the lid to decorate.

- Looking at the mechanism for the transponder to attach to various objects. We would prefer that there is a locating groove or slot (something along these lines) that allows the transponder design to locate into a separate bracket designs in the future. This would give us much higher flexibility in terms of mounting options going forward. So imagine a bracket that holds the transponder firmly on the sides, we are thinking it may be best to employ a groove or slot on the sides of the transponder housing.

Hope this helps and thank you so much for all the designs we have received so far.

MobiiSystems

Buyer

Sat, 18 May 2019 06:57:58 +0000
Hi David.Thue, the PCB measures 34mm x 14mm
Fri, 17 May 2019 18:39:43 +0000
What is the total size of the PCB in mm?

gikam

Designer

Fri, 17 May 2019 17:06:04 +0000
Hi. did you rate my design to 0 stars, or you didn't rate it yet?
thanks

gikam

Designer

Fri, 17 May 2019 16:15:54 +0000
Thanks. I'd like to see your opinion soon (and the stars;), because I have plenty of time this week to improve it if necessary.

MobiiSystems

Buyer

Fri, 17 May 2019 16:08:10 +0000
Hi Gikam, thank you, we are reviewing this with the team shortly.

gikam

Designer

Fri, 17 May 2019 15:56:22 +0000
Hi Mobii, what about my design?

gikam

Designer

Fri, 17 May 2019 15:54:32 +0000
how to hide my designs?

MobiiSystems

Buyer

Fri, 17 May 2019 13:37:48 +0000
Hi Indjmay, you can supply the design in any format. Apologies, it is not possible for me to edit the contest information.
Fri, 17 May 2019 13:35:30 +0000
Is solidworks a must? Solidworks will open a file from many other programs.

gikam

Designer

Fri, 17 May 2019 13:25:26 +0000
what is the diameter of the pipe of the bike fork, where it will be attached?

MobiiSystems

Buyer

Fri, 17 May 2019 12:32:01 +0000
Hi Gikam, yes, that sounds right.

gikam

Designer

Fri, 17 May 2019 12:17:09 +0000
I'll make it 1.5 mm. is ok?

MobiiSystems

Buyer

Fri, 17 May 2019 12:13:44 +0000
Hi Gikam, there is restriction on the thickness. However, typically with Polycarbonate (if this is used) you would typically have a minimum wall thickness of 1.3mm

gikam

Designer

Fri, 17 May 2019 12:10:35 +0000
ok. let's see... any restrictions for the case thickness?

MobiiSystems

Buyer

Fri, 17 May 2019 11:53:05 +0000
Hi Gikam, a radius of 1mm would likely make the transponder look too "boxy". We cannot make any changes to the PCB, so the housing will need to accommodate for the PCB.

gikam

Designer

Fri, 17 May 2019 11:47:47 +0000
a radius of about 1 mm for each corner will make the case much stronger! is it possible a radius of 1 mm for the PCB corners?

MobiiSystems

Buyer

Fri, 17 May 2019 11:45:49 +0000
Hi Gilkam, there is a lot going on in the various layers with different PCB traces so that is not possible.

It would be best to make the housing design slightly larger to accommodate for rounded corners.

gikam

Designer

Fri, 17 May 2019 11:43:34 +0000
can you round a bit the corners of the PCB?

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