ElectronicDesign < Velo

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---+ Electronic Design for the Velo Bling-Bling Project

LED lights for bicycle wheels.
16 multi color LEDs on both sides (PCB top- and bottom side).
There are two windows (upper and lower) on both sides for display 
dynamic information like speed, trip time, trip distance, etc. or
static information like strings and images.

The Printed Circuit Board (PCB) is free hardware. The PCB is a multi-layer (4 layer) 160 x 30.5 x 1.6 mm FR4 board. The [[MainMCUFirmware][firmware]] for the [[MainMCUFirmware#MCU_MK22DX256VLF5][MK22DX256VLF5]] MCU is also on [[https://github.com/spyren/veloblingbling-mcu][GitHub]].

There is also an optional Bluetooth Low Energy (Smart) subsystem on board. 
It is a LAIRD BL652-SA module (before v2.3 BL600-SA). The [[BluetoothApplication][Bluetooth application software]] is on 
[[https://github.com/spyren/veloblingbling-ble][GitHub]] too.

It is possible to mount the PCB direct onto the wheel spokes but it is 
better to use a mounting frame. This frame can be ordered from
http://shapeways.com or you can print it by yourself on 3D printer. See FrameDesign and
[[https://github.com/spyren/veloblingbling-frame][GitHub]].


---++ Copyright

Peter Schmid, Zurich Switzerland, peter@spyr.ch

This work (electronic design) is licensed under a Creative Commons Attribution-ShareAlike 4.0 International Public License. To view a copy
of this license, visit http://creativecommons.org/licenses/by-sa/4.0/ or send a letter to Creative Commons, 171
Second Street, Suite 300, San Francisco, California, 94105, USA.

<a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by-sa/4.0/88x31.png" /></a><br /><span xmlns:dct="http://purl.org/dc/terms/" property="dct:title">Velo Bling-Bling</span> by <a xmlns:cc="http://creativecommons.org/ns#" href="http://veloblingbling.ch" property="cc:attributionName" rel="cc:attributionURL">Peter Schmid</a> is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">Creative Commons Attribution-ShareAlike 4.0 International License</a>.


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---+ Schematics
[[%ATTACHURLPATH%/ewheel32-sch-1.png][<img src="%ATTACHURLPATH%/ewheel32-sch-1-small.png" alt="ewheel32-sch-1-small.png" width="900" height="606" />]]

[[%ATTACHURLPATH%/ewheel32-sch-2.png][<img src="%ATTACHURLPATH%/ewheel32-sch-2-small.png" alt="ewheel32-sch-1-small.png" width="900" height="606" />]]


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---+ PCB Layout
[[%ATTACHURLPATH%/ewheel32.png][<img src="%ATTACHURLPATH%/ewheel32-small.png" alt="ewheel32-small.png" width="900" height="526" />]]

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---+ Bill of Material
| *Qty* | *Value*           | *Package*  | *Parts*                                                | *Description*                  | *Farnell*| *Mouser*          | *Distrelec* |
|      2| 33                | R0805      | R54, R55                                               | Resistor                       |          | 667-ERJ-P6WF33R0V |             |
|     96| 220               | R0805      | R2, R3, ..  R111                                       | Resistor                       | 2008374  | 667-ERJ-6ENF2200V |             |
|      3| 4.7k              | R0805      | R51, R61, R62                                          | Resistor                       |          | 667-ERA-6AEB472V  |             |
|      2| 10k               | R0805      | R57, R112                                              | Resistor                       |          | 667-ERJ-6ENF1002V |             |
|      5| 100k              | R0805      | R49, R52, R53, R59, R60                                | Resistor                       |          | 667-ERJ-6ENF1003V |             |
|      1| 1.0M              | R0805      | R1                                                     | Resistor                       |          | 667-ERA-6AEB105V  |             |
|      2| 12p               | C0805      | C9, C10                                                | Capacitor                      |          | 581-08055A120J    |             |
|      2| 22p               | C0805      | C12, C13                                               | Capacitor                      | 1759195  | 80-C0805C220J1G   | 831416      |
|     12| 100n              | C0805      | C3, C5, C7, C8, C14, C15, C17, C20, C24, C26, C27, C28 | Capacitor                      |          | 81-GRM40X104K50L  |             |
|     12| 4.7u              | C0805      | C1, C2, C4, C6, C16, C18, C19, C21, C22, C23, C25      | Capacitor                      |          | 81-GCM21BR71C475KA3L |            |
|      2| 330               | L1206      | R50, R63                                               | EMI Filter 330 Ohm, 3A         |1635756   | 710-742792121     |             |
|      1| 32.768kHz         | ABS07      | Q1                                                     | Quartz                         | 2101347  |815-ABS07-32.768KHZT|            |
|      1| 8MHz              | !ABM3B     | Q2                                                     | Quartz                         |2467818RL |815-ABM3B-8.0-B2-T |             |
|      2| !BAT54C           | SOT23      | D3, D4                                                 | Dual Schottky Diodes           | 1621834  | 512-BAT54C        |             |
|      2| !GSOT05C-!E308    | SOT23      | D1, D2                                                 | Dual Diode TVS                 | 2355439  | 78-GSOT05C-E3-08  | 605685      |
|     32| !CLV1A-FKB        | PLCC4      | LD1, LD2, .. LD32                                      | RGB LED                        |2430039RL |941-V1AFKBCHMKPEH7A3|            |
|      1| !MK22DX256VLF5    | QFP-48N    | U1                                                     | MCU, KINETIS K22               |          | 841-MK22DX256VLF5 |             |
|      1| LAIRD !BL652-SA   | BL652      | U5                                                     | Bluetooth Module               | 2664536  | 239-BL652-SA      |             |
|     12| !MC74HC595ADTR2G  | SOP-16N    | U6, U7, .. U17                                         | 8-Bit Serial-In Shift Register | 2425499  |863-MC74HC595ADTR2G| 649594      |
|      1| !MCP73832T-2ACI/OT| SOT-5N     | U4                                                     | Charge Management Controller   | 1332159  |579-MCP73832T-2ACIOT|            |
|      1| !A3213LH          | SOT23-W    | U18                                                    | Linear Hall Effect Sensor      | 1457117  |                   |             |
|      1| !MMA8451QR1       | QFN-16N    | U3                                                     | 3-Axis, Digital Accelerometer  | 1842359  | 841-MMA8451QR1    |             |
|      1| !MPL3115A2        | DFN-8N     | U2                                                     | Pressure Sensor, 20-110KPA     | 2009084  | 841-MPL3115A2     |             |
|      2| PIN-HEADER 2-5    | 2-5-SMD    | X1, X2                                                 | Pin Header 2x5 1/20"           | 1022310  | 855-M50-3600542   | 127196      |
|      1| MICRO-USB         | !ZX62R-B-5P| X4                                                     | Hirose Micro USB Connector     | 2300439  | 798-ZX62R-B-5P    |             |
|      1| !B3S-1002         | !B3S-1000  | S1                                                     | Push Button                    | 959728   | 653-B3S-1002      |             |


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---+ Get the CAE Data and Change the Design

---++ Get the CAE Data from the Repository
The Velo Bling-Bling electronic design project is on the !GitHub repository https://github.com/spyren/veloblingbling-pcb. Download the [[https://github.com/spyren/veloblingbling-pcb/archive/master.zip][ZIP-File]] and unzip it or better 
[[https://help.github.com/articles/cloning-a-repository/][clone the repository]] e.g. for GNU/Linux:
<pre>
psi@homer:~/veloblingbling/pcb> <b>git clone https://github.com/spyren/veloblingbling-pcb</b>
Klone nach 'veloblingbling-pcb' ...
remote: Counting objects: 265, done.
remote: Compressing objects: 100% (97/97), done.
remote: Total 265 (delta 167), reused 260 (delta 166), pack-reused 0
Empfange Objekte: 100% (265/265), 223.50 KiB | 0 bytes/s, Fertig.
Löse Unterschiede auf: 100% (167/167), Fertig.
Prüfe Konnektivität ... Fertig.
psi@homer:~/veloblingbling/pcb>
</pre>

---++ EAGLE PCB Design Tool

EAGLE from [[http://www.cadsoftusa.com/eagle-pcb-design-software/][CadSoft]] is not free software. But there is a [[http://www.cadsoftusa.com/download-eagle/freeware/][Light Edition]]. With this edition you can at least view and print the drawings. The design exceeds the limits (100 x 80 mm board size) for the Light Edition, therefore you can not edit/change this design. There is also _EAGLE Make Personal_ edition, with this edition (140 €) you can edit the design (restricted to non commercial use). See [[http://www.cadsoftusa.com/eagle-pricing/][EAGLE Pricing Table]] for other licenses.

Maybe the free [[http://kicad-pcb.org/][KiCad]] or [[http://fritzing.org][fritzing]] can be used to import the design.


---++ How To Order PCBs

I ordered my PCBs from [[http://www.pcb-pool.com/][PCB-POOL]], they accept the EAGLE design files (e.g. =ewheel32.brd=) and you do not have to generate you own Gerber and Excellon drill files. 

Some ordering information:
   * Length in mm: 160
   * Width in mm: 30
   * File format: EAGLE
   * Base material: FR4, 35 µm Cu, 1,6 mm
   * Soldermask: inclusive
   * Position print / Silkscreen: yes, TOP and BOTTOM
   * The price includes silkscreen for 36.65 EUR
   * Surface: ENIG (Electroless Nickel Gold) for ultra-flat pads
   * Min. track / gap size: >= 0.150 mm (6 mil)
   * Min. drill-end diameter: >= 0.3 mm (12 mil)
   * E Test inclusive
   * Free Stencil: yes


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---+ Snap-away Controller/LED Board

If do not need the LEDs you can use the controller board without it, just snap-off the LED part. 

Or vice versa if you want to use the LEDs for another controller board. The controller can switch on and off the LEDs over a Serial Peripheral Interface ([[https://en.wikipedia.org/wiki/Serial_Peripheral_Interface_Bus][SPI]]) bus. The controller is the master, the LEDs on top and bottom side are arranged as slaves.

Pin-Header X5/X6:
| *Pin#*  | *SPI Signal*     |
| 1       | (OE)             |
| 2       | SS- top          |
| 3       | SS- bottom       |
| 4       | (RESET-)         |
| 5       | SCLK             |
| 6       | MOSI             |
| 7       | VCC              |
| 8       | GND              |

[[%ATTACHURLPATH%/snap-away.jpg][<img src="%ATTACHURLPATH%/snap-away-s.jpg" alt="snap-away-s.jpg" width="900" height="467" />]]


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-- %USERSIG{PeterSchmid - 2016-03-30}%

---++ Comments

%COMMENT%
Attachments
Topic attachments
I	Attachment	History	Action	Size	Date	Who
png	ewheel32-sch-1-small.png	r2 r1	manage	223.1 K	2016-11-12 - 20:30	PeterSchmid
png	ewheel32-sch-1.png	r2 r1	manage	204.5 K	2016-11-12 - 20:24	PeterSchmid
png	ewheel32-sch-2-small.png	r2 r1	manage	284.0 K	2016-11-12 - 20:30	PeterSchmid
png	ewheel32-sch-2.png	r2 r1	manage	211.3 K	2016-11-12 - 20:24	PeterSchmid
png	ewheel32-small.png	r2 r1	manage	244.4 K	2016-11-12 - 20:34	PeterSchmid
png	ewheel32.png	r2 r1	manage	147.1 K	2016-11-12 - 20:34	PeterSchmid
jpg	snap-away-s.jpg	r1	manage	137.6 K	2016-11-13 - 08:53	PeterSchmid
jpg	snap-away.jpg	r1	manage	614.4 K	2016-11-13 - 08:53	PeterSchmid
Topic revision: r14 - 2016-12-10 - PeterSchmid