adamatom/chewtoyThis is a KiCad project for a i2c and GPIO expander cape for the BeagleBone Black. It provides eight expansion ports, with each port offering access to the common i2c bus as well as two dedicated GPIO pins
Chewtoy is an open-source printed circuit board by adamatom, from the adamatom/chewtoy repository on GitHub, published under the CC0-1.0 licence. It is a 4-layer board of 86.4 × 54.6 mm with 37 parts on 131 nets, routed with 472 tracks and 65 vias.
It is built around the PCA9518PW, PCF8575CDB and CAT24C256LI, with the LP5907 among its other parts. Its parts include 14 resistors, 8 connectors, 6 capacitors, 6 ICs and 1 diode.
This is a KiCad project for a i2c and GPIO expander cape for the BeagleBone Black. It provides eight expansion ports, with each port offering access to the common i2c bus as well as two dedicated GPIO pins
| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 1.8K | Capacitors_SMD:C_0805 | R1, R2, R3, R4, R5, R6, R11, R12 |
| 5 | 100K | Capacitors_SMD:C_0805 | R7, R8, R9, R10, R14 |
| 4 | 100nF | Capacitors_SMD:C_0805 | C1, C2, C4, C6 |
| 2 | 1uF | Capacitors_SMD:C_0805 | C3, C5 |
| 2 | PCA9518 | Housings_SSOP:TSSOP-20_4.4x6.5mm_Pitch0.65mm | U1, U2 |
| 1 | 220 | Capacitors_SMD:C_0805 | R13 |
| 1 | BEAGLEBONEBLACK | bbb:BEAGLEBONEBLACK | U6 |
| 1 | CAT24C256 | Housings_SOIC:SOIJ-8_5.3x5.3mm_Pitch1.27mm | U5 |
| 1 | LOGO | logos:AceSmall | G*** |
| 1 | LOGO | logos:atom | G*** |
| 1 | LP5907 | Housings_SOT-23_SOT-143_TSOT-6:SOT-23-5 | U4 |
| 1 | Led_Small | Capacitors_SMD:C_0805 | D1 |
| 1 | PCF8575C | Housings_SOIC:SOIC-24_7.5x15.4mm_Pitch1.27mm | U3 |
| 1 | PORT1 | Pin_Headers:Pin_Header_Straight_2x03 | P1 |
| 1 | PORT2 | Pin_Headers:Pin_Header_Straight_2x03 | P2 |
| 1 | PORT3 | Pin_Headers:Pin_Header_Straight_2x03 | P3 |
| 1 | PORT4 | Pin_Headers:Pin_Header_Straight_2x03 | P4 |
| 1 | PORT5 | Pin_Headers:Pin_Header_Straight_2x03 | P5 |
| 1 | PORT6 | Pin_Headers:Pin_Header_Straight_2x03 | P6 |
| 1 | PORT7 | Pin_Headers:Pin_Header_Straight_2x03 | P7 |
| 1 | PORT8 | Pin_Headers:Pin_Header_Straight_2x03 | P8 |
adamatom/chewtoy
This is a KiCad project for a i2c and GPIO expander cape for the BeagleBone Black. It provides eight expansion ports, with each port offering access to the common i2c bus as well as two dedicated GPIO pins
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adamatom/chewtoy
This is a KiCad project for a i2c and GPIO expander cape for the BeagleBone Black. It provides eight expansion ports, with each port offering access to the common i2c bus as well as two dedicated GPIO pins
edgranzella/PTuP_2026_displayLCD_8Zonas_4Salidas
Este repositorio contiene el diseño electrónico y ruteado de PCB avanzado desarrollado en KiCad para el módulo PTuP 2026.
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neuroidss/FreeEEG32-beta
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neuroidss/FreeEEG32-alpha1.5
4xAD7771BCPZ 64 kSPS, ADR4525BRZ 2.5V REF +-0.02%, STM32H743ZIT6 MCU 1027 DMIPS
It measures 86.4 × 54.6 mm and has 4 copper layers, 1.6 mm thick.
37 parts, built around the PCA9518PW, PCF8575CDB, CAT24C256LI and LP5907. 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.
From the adamatom/chewtoy repository on GitHub, at the commit this page was made from: the board is cape/chewtoy.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Its repository publishes it under the CC0-1.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).