2 layers30 × 30 mm
MoodLogger v1
sullyjason/MoodLogger
A tiny, battery-powered button logger. Press one of (at least) four buttons and the device wakes up, appends which button was pressed at what time to a CSV file, and goes back to sleep.
48 parts
2 layers84.1 × 97.1 mm
Snowflake
maholli/snowflake2snowflake PCBs w/ SAMD21 and neopixels
- Size
- 84.1 × 97.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 47
- Nets
- 66
- Pads
- 198
- Tracks, vias
- 418, 69
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 21 Nov 2018
- Updated
- 13 Dec 2018
Overview
Snowflake is an open-source printed circuit board by maholli, from the maholli/snowflake repository on GitHub. It is a 2-layer board of 84.1 × 97.1 mm with 47 parts on 66 nets, routed with 418 tracks and 69 vias.
It is built around the ATSAMD21G18A-AU, AP2112K-3.3 and MCP73831T-2ACI/OT-HXY, with the B2B-PH-SM4-TB and DMG3415U among its other parts. Its parts include 16 diodes, 12 capacitors, 7 connectors, 4 resistors and 3 ICs. It belongs with the SAM D and SAM boards of this library.
Main components
5
ATSAMD21G18A-AU
TQFP-48-40℃~+85℃ 1.62V~3.6V 10bit 12bit 256KB 32 Bit 32KB 38 48MHz ARM Cortex-M0+ Built-in FLASH 上电复位(POR)、欠压检测(BOR/LVD/LVR/LVI)、看门狗复位、内置通用定时器、硬件CRC、日历功能、触控功能 TQFP-48(7x7) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
AP2112K-3.3
SOT253.3V 600mA CMOS Low Dropout Linear Regulator with EnableDiodes IncorporatedUncategorisedMCP73831T-2ACI/OT-HXY
SOT-23-5LBattery ManagementHXY MOSFET
B2B-PH-SM4-TB
SMD,P=2mm-25℃~+85℃ 1 100V 1x2P 2 2A 2P 2mm 6.6mm 7.95mm 7mm Auxiliary Solder Pin Beige Copper alloy PA PH Surface Mount,Vertical Tin UL94V-0 SMD,P=2mm Wire To Board Connector ROHSJSTWire To Board Connector
DMG3415U
SOT-23MOSFETsTECH PUBLIC
README
README.mdCongratulations on your new snowflake!
This board is a result of a lab64's 2018 HoLLiday workshop, courtesy of Stanford's Electrical Engineering Department. lab64: lab64.stanford.edu
All the design files, including hardware and software, for this project are available on github: snowflake github: https://github.com/maholli/snowflake
This board can be programmed with arduino or circuitpython (default).
If you'd like to switch to arduino, plug it into your computer via USB, and quickly double-click the "RST" button. A new drive called FEATHERBOOT will appear. You can now flash it normally using the Arduino IDE and choosing "Adafruit Feather M0" as the board.
- To switch back to circuitpython, put the board into FEATHERBOOT mode again, and drag the "snowflake_v1a.uf2" file (found on the github) onto the drive. It will automatically reset once the transfer is complete.
This board is based on the Adafruit Feather M0
- To learn how to use the LEDs or capacitive-touch buttons, please read Adafruit's wonderful tutorials: https://learn.adafruit.com/adafruit-circuit-playground-express/what-is-circuitpython
Pin Conventions
A few pins on the board have been given special names, these used the "board" descriptor. The remainder of the pins must be addressed using the "microcontroller" descriptor.
For example....
- The LEDs are called "NEOPIXEL" and you can operate them as described here: https://learn.adafruit.com/adafruit-circuit-playground-express/circuitpython-neopixel
- There are TWO capacitive touch buttons named "CAP0" and "CAP1" respectively. These buttons correspond to the two pointy bits of the snowflake opposite from the USB connector.
- Example files can be found on the snowflake github listed above.
This all made possible because Adafruit invests time and resources providing open source designs and software. Please support Adafruit and open-source hardware by purchasing products from Adafruit and documenting your projects!!
Have fun! <3 lab64 team 2018
Parts
47| Qty | Value | Footprint | References |
|---|---|---|---|
| 15 | WS2812B3535 | Adafruit Circuit Playground Express:LED3535 | LED1, LED2, LED3, LED4, LED5, LED6, LED7, LED8, LED9, LED10, LED11, LED12, LED13, LED14, LED15 |
| 4 | 1uF | Capacitor_SMD:C_0805_2012Metric | C1, C9, C10, C11 |
| 3 | 10uF | Capacitor_SMD:C_0603_1608Metric | C3, C4, C8 |
| 3 | Conn_01x04_Male | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical_SMD_Pin1Left | J1, J3, J7 |
| 2 | 10K | Resistor_SMD:R_0603_1608Metric | R3, R4 |
| 2 | 22pF | Capacitor_SMD:C_0603_1608Metric | C13, C14 |
| 2 | Conn_01x04_Male | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J2, J4 |
| 1 | custom-footprints:LOGO (2) | LOGO | |
| 1 | 0.1uF | Capacitor_SMD:C_0805_2012Metric | C12 |
| 1 | 100K | Resistor_SMD:R_0603_1608Metric | R1 |
| 1 | 10uF | Capacitor_SMD:C_0805_2012Metric | C7 |
| 1 | 1K | Resistor_SMD:R_0603_1608Metric | R2 |
| 1 | 1uF | Capacitor_SMD:C_0603_1608Metric | C2 |
| 1 | AP2112K-3.3 | Trinket M0 rev D:SOT23-5 | U2 |
| 1 | ATSAMD21G18 | Package_QFP:TQFP-48_7x7mm_P0.5mm | U1 |
| 1 | B2B-PH-SM4-TB | Connector_JST:JST_PH_B2B-PH-SM4-TB_1x02-1MP_P2.00mm_Vertical | J5 |
| 1 | DIODESOD-123 | Diode_SMD:D_SOD-123 | D1 |
| 1 | DMG341 | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | KMR2 | Adafruit Circuit Playground Express:BTN_KMR2_4.6X2.8 | RESET1 |
| 1 | MCP73831T-2ACI/OT | Package_TO_SOT_SMD:SOT-23-5 | U3 |
| 1 | MicroB USB | Adafruit Circuit Playground Express:4UCONN_20329_V2 | CN1 |
| 1 | ORANGE LED | LED_SMD:LED_0805_2012Metric | CHG1 |
| 1 | ST3215SB | Crystal:Crystal_SMD_MicroCrystal_CC7V-T1A-2Pin_3.2x1.5mm | X1 |
Questions
How big is the Snowflake PCB?
It measures 84.1 × 97.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Snowflake use?
47 parts, built around the ATSAMD21G18A-AU, AP2112K-3.3, MCP73831T-2ACI/OT-HXY and B2B-PH-SM4-TB. 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 Snowflake KiCad files?
From the maholli/snowflake repository on GitHub, at the commit this page was made from: the board is snowflake_1/snowflake.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Snowflake design in my own project?
Its repository states no licence, so its author keeps all rights: ask maholli before reusing the design.
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