2 layers66.8 × 29.7 mm
2 layers230 × 230 mm
Visualizer for Covid-19 Exposure Notifications
- Size
- 230 × 230 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 35
- Nets
- 78
- Pads
- 136
- Tracks, vias
- 284, 65
- Routed
- Yes
- KiCad
- KiCad 5 (file 20200921)
- Created
- 23 Sep 2020
- Updated
- 27 Sep 2020
Overview
Leds is an open-source printed circuit board by znuh, from the znuh/exposure-notifications repository on GitHub. It is a 2-layer board of 230 × 230 mm with 35 parts on 78 nets, routed with 284 tracks and 65 vias.
Its parts include 25 diodes, 8 resistors and 2 connectors.
README
README.mdExposure Notifications
Printed Circuit Boards for the Covid-19 Exposure Notifications Visualizer - see this for more details
To remake Exposure Notifications you need to get/make four things:
- a BBC micro:bit or Calliope Mini with the microbit-corona-scanner installed
- a black 23x23cm RIBBA frame from IKEA
- the printed circuit board for the LEDs - see the leds/ directory of this repository
- the printed circuit board for the LED matrix controller - either matrixctl-v1 OR matrixctl-v2
- matrixctl-v2 includes a socket for the micro:bit and a switching voltage regulator
- matrixctl-v1 comes without a socket for the micro:bit and has no switching voltage regulator
- v2 is more efficient and keeps the LED matrix driver cooler when more LEDs light up - therefore I recommend using v2
The printed circuit board designs are made with a Nightly Development Build of KiCAD. If you want to open/edit them you also need a recent Nightly Development Build. If you just want to use the PCBs unmodified you can also use the gerber-files from the gerber-subdirectories.
LED matrix board
The LED matrix board uses Würth 150141RV73100 LEDs. These are bicolor-LEDs but only the red LED is used.
The landing pads for the LEDs have been reduced to a minimum to hide the pads underneath the LEDs. All PCB tracks are on the back side of the PCB. 1206 0-Ohms resistors are used instead of vias to cross tracks.
matrixctl v2 board
The part number of the micro:bit socket is PIS-1240. The Micro-USB connector is a Molex 105017-0001. You can get these parts and all additional components from digi-key.
Following a recommendation from the IS31FL3738 datasheet the board includes a Tantalum Capacitor to avoid audible noise produced by ceramics capacitors through the piezoelectric effect. Tantalum is a conflict resource. I've chosen a Kemet T495B336K010ATE450 because Kemet is a sane choice in general and their handling of the issue sounds ok.
If you do not want to use the micro:bit socket you can also connect the micro:bit or a Calliope Mini to the pin header of the PCB. You need to connect I²C (SCL and SDA), 3V and GND.
Parts
35| Qty | Value | Footprint | References |
|---|---|---|---|
| 25 | LED_Dual_AACC | leds:Wuerth_150141RV73100 | D101, D102, D103, D104, D105, D106, D107, D108, D109, D110, D111, D112, D113, D114, D115, D116 +9 |
| 8 | 0 | Resistor_SMD:R_1206_3216Metric | R101, R102, R103, R104, R105, R106, R107, R108 |
| 2 | Conn_02x05_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x05_P2.54mm_Vertical_SMD | J101, J102 |
More from znuh/exposure-notifications
2- 2 layers53.3 × 15.2 mm
Similar boards
- 2 layers97.2 × 59.1 mm
ArmLEDsPrototype
hackclub/OnBoard
💡 Join 1,000 teenagers and make your first PCB with a $100 grant!
35 parts915 - 2 layers62 × 42 mm
- 2 layers75 × 26 mm
DIY detector electron variant
ozel/DIY_particle_detector
A mobile low-cost spectrometer for measuring radioactivity and the energy of ionising radiation like alpha particles and electrons
35 parts558BSD-2-Clause - 2 layers45 × 25 mm
ReCamera Basically Board
Seeed-Studio/OSHW-reCamera-Series
reCamera is a series of open-source AI cameras.
35 parts495Apache-2.0 - 2 layers160.8 × 24.4 mm
- 2 layers75 × 50 mm
- 2 layers50 × 20.5 mm
- 2 layers50.5 × 67.1 mm
Questions
How big is the Leds PCB?
It measures 230 × 230 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Leds use?
35 parts. 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 Leds KiCad files?
From the znuh/exposure-notifications repository on GitHub, at the commit this page was made from: the board is leds/leds.kicad_pcb and its schematic leds/leds.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Leds design in my own project?
Its repository states no licence, so its author keeps all rights: ask znuh before reusing the design.