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4 layers32.7 × 7.6 mmOsw spy, the printed circuit board in 3D

Spy edition of the open-smartwatch by @uvwxy

Size
32.7 × 7.6 mm
Copper layers
4
Thickness
1.6 mm
Parts
61
Nets
66
Pads
254
Tracks, vias
691, 66
Pours
4
Routed
Yes
KiCad
KiCad 5 (file 20171130)
Created
14 Mar 2022
Updated
14 Mar 2022

Overview

Osw spy is an open-source printed circuit board by akinbender, from the akinbender/open-smartwatch-spy repository on GitHub, published under the GPL-3.0 licence. It is a 4-layer board of 32.7 × 7.6 mm with 61 parts on 66 nets, routed with 691 tracks and 66 vias.

It is built around the CH340E, BMA400 and DS3231MZ/V+, with the MCP73831T-2ACI/OT-HXY and TPS2115APW among its other parts. Its parts include 23 capacitors, 17 resistors, 12 ICs, 4 switches and 3 connectors.

Main components

5

README

README.md

Open-Smartwatch Spy Edition beta

Based on the open source smartwatch project Open-Smartwatch by Paul's 3D Things. The rugged box is designed after this thingiverse project Check out my twitter thread about the build.

Must TODOs for v1.0 release

  1. Fix button placements. (Buttons are in wrong order)
  2. add female connector for battery, soldering is really unpleasent at that point of the assembly.
  3. buy some other micro stepper motor such as this geared one and a female connector for it.
  4. find schematic and footprint of the afformentioned female connector for the board, and order new pcb.
  5. 3d design of the new motor & release mechanism
  6. finish osw firmware extension for motor control (didn't check it in, not required at this point)
  7. Fix rugged box design. (Current design cannot fit the straps and only has two dart holders) Also gotta fix my 3d printer to print another one..

Optional TODOs

Check out Paul's instagram page, he has designed an awesome new watch. Ultimately and hopefully, I will also switch to the new board design. I dont know which changes are going to be included when, but I have some plans.

  1. switch micro-USB for waterproof 4 pin connector
  2. switch buttons for some waterproof alternative, maybe seperate pcb touch buttons?
  3. waterproof design with O-rings and stuff, don't really know how yet..
  4. Induction Charging option

Notes

Currently there is a fully plastic test dart, and one that can be fashioned out of a M3 allen key. Depending on multiple build desicions, you can really end up hurting someone with the metal dart. This should go without saying, but I (and Paul) obviously do not accept any responsibility, I never do..

Also going to visit a local magic shop for guidance about trick darts. Magic is all about deception, most spygear too.. So maybe I might build some pyro, flash or smoke darts. Can also build an injector dart. I looked closely to my Covid vaccine injector, it can fit inside the chamber but there is no way that it can be useful.

I named the project because well, it's obvious right? But my aim was to build a self protection gear in the form of a daily wearable item for my sis and my mom. And lets face it, shooting darts is not the optimal solution for them. Long story short, after v1.0 release an alternative design with a gas canister instead of a dart shooter is also needed.

Parts

61
QtyValueFootprintReferences
150.1uCapacitor_SMD:C_0603_1608MetricC3, C4, C8, C9, C10, C11, C13, C14, C15, C18, C19, C20, C21, C22, C23
610kResistor_SMD:R_0603_1608MetricR8, R9, R10, R11, R17, R21
4SW_Pushopen-Smartwatch:button_side_smdSW1, SW2, SW4, SW5
3100uCapacitor_SMD:C_1206_3216MetricC5, C6, C7
34.7uCapacitor_SMD:C_0603_1608MetricC12, C16, C17
3XC6209Package_TO_SOT_SMD:SOT-23-5U8, U10, U13
21kResistor_SMD:R_0603_1608MetricR6, R7
24.7uFCapacitor_SMD:C_0603_1608MetricC1, C2
2470RResistor_SMD:R_0603_1608MetricR4, R13
2Conn_01x04Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_VerticalJ2, J3
11MResistor_SMD:R_0603_1608MetricR22
12.2KResistor_SMD:R_0603_1608MetricR18
1200kResistor_SMD:R_0603_1608MetricR16
122Resistor_SMD:R_0603_1608MetricR1
1220kResistor_SMD:R_0603_1608MetricR19
12N7002Package_TO_SOT_SMD:SOT-23Q1
1510RResistor_SMD:R_0603_1608MetricR14
15kResistor_SMD:R_0603_1608MetricR15
1BMA400open-Smartwatch:LGA-12_2x2mm_P0.5mmU2
1CH340Eopen-Smartwatch:MSOP-10_3x3mm_P0.5mmU6
1Conn_01x02Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_VerticalJ1
1DS3231MZPackage_SO:SOIC-8_3.9x4.9mm_P1.27mmU1
1GC9A01_IPS_displayopen-Smartwatch:GC9A01_IPS_displayU4
1L298N_MX1508Package_SO:SOP-16_3.9x9.9mm_P1.27mmU3
1LED_GreenLED_SMD:LED_0805_2012MetricD1
1MCP73831T-2ACI_OTopen-Smartwatch:SOT-23-5U11
1TPS2115Aopen-Smartwatch:TSSOP-8_4.4x3mm_P0.65mmU9
1USB-OTGopen-Smartwatch:USBmicro-BU5
1ttgo-32-microopen-Smartwatch:ttgo-32-microU7

Questions

How big is the Osw spy PCB?

It measures 32.7 × 7.6 mm and has 4 copper layers, 1.6 mm thick.

What parts does the Osw spy use?

61 parts, built around the CH340E, BMA400, DS3231MZ/V+ and MCP73831T-2ACI/OT-HXY. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the Osw spy KiCad files?

From the akinbender/open-smartwatch-spy repository on GitHub, at the commit this page was made from: the board is osw-spy.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the Osw spy design in my own project?

Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).

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