2010.12.25 - thinking more about a bluetooth TeleDongle variant. the basic idea is to use a cc2540 soc to provide usb and/or bluetooth interfaces, and a cc1101 transceiver on one SPI port for our RF modes. Thus the code runs on the bluetooth part unlike all our other designs. swrr072 is a USB dongle design that shows use of a Johanson integrated balun that's 0.68 at q100 with a pcb trace antenna on 2.4ghz .. pcb is 4 layers and 1.616 x 0.632" .. looks like I could take the RF end of the design as is for the 2.4gzh end. Maybe make the board wider to fit some hammond box? using a Hammond 1591XXMTBU or 1591XXLTBU, could put the 2.4ghz antenna on one of the long sides, and UHF SMA and USB+power switch on opposite small sides? Can I find a suitable lipo to mount on the non-2.4ghz side? 38 x 27 x 3mm 330mAh http://cgi.ebay.com/3-7V-330mAh-lithium-battery-Polymer-Ipod-Mp3-GPS-/220713108705?pt=US_Batteries&hash=item336386c4e1 62 x 35 x 3mm 765mAh http://cgi.ebay.com/3-7V-765mAh-lithium-battery-Polymer-Ipod-Mp3-GPS-/220713108713?pt=US_Batteries&hash=item336386c4e9 43 x 30 x 4mm 450mAh http://cgi.ebay.com/LiPo-Lithium-Polymer-Battery-3-7V-450mAh-MP3-MP4-GPS-/300427570775?pt=US_Batteries&hash=item45f2e0ee57 52 x 34 x 4mm 600mAh *good choice?* $2.30 plus shipping http://cgi.ebay.com/Lithium-Polymer-Battery-3-7V-600mAh-MP3-MP4-GPS-NAT-/290433981343?pt=US_Batteries&hash=item439f36db9f 2010.12.30 - after much online discussion, the new plan is to use a cc1111 and a Rayson BTM-182 bluetooth module .. the latter should be budgeted at about $15 each in quantity 100 .. uses async serial, less dev effort, no regulatory issues 2011.03.31 - Raysom BTM-182 peak current draw is 58mA, Roving Networks RN-42 peaks at 50mA Raysom gave us a quote of $10 per delivered at q100 RovingNetworks replied to our quote request but we don't have a number yet Rough estimate of cogs puts us at retail price of $150 2011.04.13 - Pondering how much to clip off the SMA end of the PCB to ensure the SMA flange fits inside the box. Our connector needs 3.81 mm "above" the PCB which for TeleBT actually means between the PCB bottom surface and the base of the box. The box boss height is specified as 4mm, so that fits in a purely vertical sense, but I'm worried about the box wall to base radius, and the fact that the box walls aren't exactly vertical. Hammond doesn't specify the radius between the wall and base of the 1551K box. Given other things they do specify, it might be that 1 mm is a conservative guess. The specification for the inside dimensions of the lip around the lid is 10 mils smaller than the max PCB dimensions, and it *looks* like that inside edge might be about where the wall radius ends. The drawing shows the lid inside as 6.73mm less than box outside dimension, which seems reasonably consistent with my estimate of a 2mm wall thickness, about 1mm for the lid lip, and some mold tolerances. So, let's use the box lid lip inside dimensions as a proxy for the box base inside dimensions until proven otherwise. So we need to peel 5 mils off to account for the box radius. The flange itself is 40 mils. And I'm nervous about the guesstimates so I'll add another 5 mils of margin. So we need to take 50 mils off the SMA end of the PCB. As a sanity check, on TeleDongle the closes screw hole is 78 mils from the SMA edge of the PCB, which is 50 mils less than a maximum-size PCB would have. If anything, the TeleDongle SMA ends up inside the wall a bit more that necessary, such that tightening the SMA nut deflects the wall inward. So, 50 mils might indeed be a good choice for TeleBT. We'll give it a try! 2011.06.07 - as I start to work on rotating the design, noting the changes between the max 1551 board outline and what I used for v0.1: outline layer: - Line[278543 24606 291339 24606 1000 2000 "lock"] - Line[291339 24606 291339 129921 1000 2000 "lock"] - Line[287402 133854 24606 133854 1000 2000 "lock"] - Arc[287402 129921 3937 3937 1000 2000 90 90 "lock"] + Line[278543 24606 286338 24606 1000 2000 "lock"] + Line[286338 133854 24606 133854 1000 2000 "lock"] + Line[286338 24606 286338 133854 1000 2000 "lock"] similar changes on the top layer: - Line[287402 133854 24606 133854 100 2000 "clearline,lock"] - Line[24606 133854 24606 121063 100 2000 "clearline,lock"] - Line[12795 109252 0 109252 100 2000 "clearline,lock"] - Line[3927 0 266732 0 100 2000 "clearline,lock"] - Line[291339 24606 291339 129921 100 2000 "clearline,lock"] - Line[278543 24606 291339 24606 100 2000 "clearline,lock"] - Line[266732 0 266732 12795 100 2000 "clearline,lock"] - Line[0 109252 0 3937 100 2000 "clearline,lock"] - Arc[3937 3937 3937 3937 100 2000 270 90 "clearline,lock"] - Arc[278543 12795 11811 11811 100 2000 0 90 "clearline,lock"] - Arc[287402 129921 3937 3937 100 2000 90 90 "clearline,lock"] - Arc[12795 121063 11811 11811 100 2000 180 90 "clearline,lock"] + Line[286338 24606 286338 133854 600 2000 "clearline,lock"] + Line[286338 133854 24606 133854 600 2000 "clearline,lock"] + Line[24606 133854 24606 121063 600 2000 "clearline,lock"] + Line[12795 109252 0 109252 600 2000 "clearline,lock"] + Line[3927 0 266732 0 600 2000 "clearline,lock"] + Line[278543 24606 286338 24606 600 2000 "clearline,lock"] + Line[266732 0 266732 12795 600 2000 "clearline,lock"] + Line[0 109252 0 3937 600 2000 "clearline,lock"] + Arc[3937 3937 3937 3937 600 2000 270 90 "clearline,lock"] + Arc[278543 12795 11811 11811 600 2000 0 90 "clearline,lock"] + Arc[12795 121063 11811 11811 600 2000 180 90 "clearline,lock"] 2013.01.25 - reviewing design with an eye towards moving to production - we have the ability to sample v_lipo, but is it useful? - need to move design to current preferred parts list - verify button fits cleanly through box wall - artwork is solid .. did a lot for v0.3 2013.04.08 - problems in v1.0 build fixed for v1.1 + companion and debug connectors should be rotated so cable dresses towards center of board like TD + update D1 footprint to clearly indicate cathode end so we don't mess that up again + we're not loading the flash part, so just remove it 2016.03.20 - to build a TeleBT with BTle: + swap out Rayson module for DK BM70BLES1FC2-0002AA-ND ? swap out CPU for STM32F042, since it has in-built USB bootloader