6 layers95.9 × 90.2 mm
Cpb
OakwoodEngineering/ObiWanKomputer
The Obi Wan Komputer and Combined Payload Boards from the NyanSat project.
251 parts10
4 layers100 × 100 mm
Board kicad
willowec/pressure-mat1UMaine computer engineering capstone
- Size
- 100 × 100 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 122
- Nets
- 217
- Pads
- 534
- Tracks, vias
- 968, 21
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 28 May 2023
- Updated
- 7 Feb 2024
Overview
Board kicad is an open-source printed circuit board by willowec, from the willowec/pressure-mat repository on GitHub. It is a 4-layer board of 100 × 100 mm with 122 parts on 217 nets, routed with 968 tracks and 21 vias.
It is built around the MAX11643EEG+T, 74HC595 and MMSD4148, with the BLM21BD272SN1L among its other parts. Its parts include 56 diodes, 28 resistors, 20 capacitors, 9 ICs and 4 connectors.
Main components
4
MAX11643EEG+T
QSOP-24-40℃~+85℃ 0.5LSB 0.5LSB 16 1mA 2.7V~3.6V 300kHz 4.4MHz、4.8MHz 8 External、Built-in External、Built-in Multiplexers、Power-on reset、FIFO buffer、Soft reset No SAR SPI QSOP-24 Analog to Digital Converters (ADC) ROHSMaxim Integrated (Analog Devices)Analog To Digital Converters (ADC)
74HC595
SOP-16-40℃~+85℃ 1 100ns@5V,50pF 10MHz 2V~6V 74HC 8 Serial-to-Serial or Parallel Tri-State SOP-16 Shift Registers ROHSGRShift Registers
MMSD4148
SOD-123-55℃~+150℃@(Tj) 100V 1V@10mA 200mA 425mW 4ns 5uA@75V Independent SOD-123 Switching Diodes ROHSonsemiSwitching Diodes
BLM21BD272SN1L
08051 2.7kΩ@100MHz 200mA 800mΩ ±25% 0805 Ferrite Beads ROHSMurataFerrite Beads
README
Readme.mdPressure Mat Project
This git repository contains all the code developed for the Electrical and Computer Engineering Capstone project of Evan Desmond and Willow Cunningham at the University of Maine, Orono.
The Mat
The pressure sensing mat uses the intersections between rows and columns of copper tape separated by velostat to form resistive pressure sensors. The mat has 28 rows and 56 columns, for a total of 1568 sensors at a resolution of 1cm^2.
The PCB
Schematics for the PCB are in /board_kicad A render of the pcb is shown below.
The Code
Code for the project is split into two primary parts: embedded side and host side.
Embedded Code
The code that the RPI Pico runs is in the /board_code directory. It is responsible for controlling the ADCs and shift registers on the PCB in order to read the pressure sensors in the mat, and transmitting the mat data over USB serial to the connected host computer.
Host Code
The python program in /GUI is used to view data recorded and transmitted by the interface board.
Parts
122| Qty | Value | Footprint | References |
|---|---|---|---|
| 56 | MMSD4148 | Diode_SMD:D_SOD-123 | D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23 +40 |
| 28 | 100k | Resistor_SMD:R_0603_1608Metric | R1, R2, R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R22, R23 +12 |
| 7 | 0.1uF | Capacitor_SMD:C_0603_1608Metric | C2, C4, C6, C8, C10, C12, C14 |
| 7 | 1uF | Capacitor_SMD:C_0603_1608Metric | C1, C3, C5, C7, C9, C11, C13 |
| 7 | 74HC595 | Package_DIP:DIP-16_W7.62mm | U1, U2, U3, U4, U5, U6, U7 |
| 4 | .1uF | Capacitor_SMD:C_0603_1608Metric | C15, C16, C17, C18 |
| 4 | MountingHole | MountingHole:MountingHole_2.2mm_M2 | H1, H2, H3, H4 |
| 2 | 4.7mF | Capacitor_THT:CP_Radial_D13.0mm_P5.00mm | C19, C20 |
| 2 | MAX11643EEG | Package_SO:SSOP-24_3.9x8.7mm_P0.635mm | U8, U9 |
| 1 | 02x30_ADC_Connector | Connector_PinHeader_2.54mm:PinHeader_2x30_P2.54mm_Vertical | J2 |
| 1 | 02x30_Shift_Register_Connector | Connector_PinHeader_2.54mm:PinHeader_2x30_P2.54mm_Vertical | J1 |
| 1 | BLM21BD272SN1L | capstone_custom:BEADC2012X145N | FL1 |
| 1 | PicoPinSocketA | Connector_PinSocket_2.54mm:PinSocket_1x20_P2.54mm_Vertical | J4 |
| 1 | PicoPinSocketB | Connector_PinSocket_2.54mm:PinSocket_1x20_P2.54mm_Vertical | J3 |
Questions
How big is the Board kicad PCB?
It measures 100 × 100 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Board kicad use?
122 parts, built around the MAX11643EEG+T, 74HC595, MMSD4148 and BLM21BD272SN1L. 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 Board kicad KiCad files?
From the willowec/pressure-mat repository on GitHub, at the commit this page was made from: the board is board_kicad/board.kicad_pcb and its schematic board_kicad/board.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Board kicad design in my own project?
Its repository states no licence, so its author keeps all rights: ask willowec before reusing the design.
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