2 layers64.9 × 66.2 mm Dev board, the printed circuit board in 3D

Dev board

Modular robotic tentacle

Size: 64.9 × 66.2 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 27
Nets: 53
Pads: 216
Tracks, vias: 402, 60
Pours: 2
Routed: Yes
KiCad: KiCad 7 (file 20221018)
Created: 12 Sep 2023
Updated: 7 Nov 2023

Overview

Dev board is an open-source printed circuit board by rc-sr, from the rc-sr/tentacle repository on GitHub, published under the MIT licence. It is a 2-layer board of 64.9 × 66.2 mm with 27 parts on 53 nets, routed with 402 tracks and 60 vias.

It is built around the L7805 and CON-SOCJ-2155. Its parts include 8 connectors, 6 capacitors, 4 resistors and 2 ICs. It belongs with the microcontroller boards boards and the RP2040 boards of this library.

Main components

README

hardware/pcb/dev-board/README.md

Development Board

TODO: Add more details about the board

Pinout

Microstep Configuration

Both motors share microstep configuration pins

DRV8825 Pin	Pico Pin
MODE 0	GPIO2
MODE 1	GPIO3
MODE 2	GPIO4

Motor 1

DRV8825 Pin	Pico Pin
DIR	GPIO7
STEP	GPIO6
ENABLE	GND
SLEEP	GPIO8
RESET	GND
FAULT	GND

Motor 2

DRV8825 Pin	Pico Pin
DIR	GPIO10
STEP	GPIO9
ENABLE	GND
SLEEP	GPIO8
RESET	GND
FAULT	GND

Motor 3

DRV8825 Pin	Pico Pin
DIR	GPIO13
STEP	GPIO12
ENABLE	GND
SLEEP	GPIO11
RESET	GND
FAULT	GND

Motor 4

DRV8825 Pin	Pico Pin
DIR	GPIO16
STEP	GPIO15
ENABLE	GND
SLEEP	GPIO14
RESET	GND
FAULT	GND

Motor Connectors

All motor connectors map to the same pins of their corresponding DRV8825 modules

Connector Pin	DRV8825 Pin
1	B2
2	B1
3	A1
4	A2

Parts

Qty	Value	Footprint	References
4	100uf	Capacitor_THT:CP_Radial_D6.3mm_P2.50mm	C1, C2, C3, C4
4	4.7k	Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R1, R2, R3, R4
4	Pololu_Breakout_DRV8825	Module:Pololu_Breakout-16_15.2x20.3mm	A1, A2, A3, A4
3	Fiducial	Fiducial:Fiducial_1mm_Mask2mm	FID1, FID2, FID3
1	0.1uf	Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder	C6
1	0.33uf	Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder	C5
1	CON-SOCJ-2155	devboard:GRAVITECH_CON-SOCJ-2155	J7
1	Conn_01x11	Connector_PinHeader_2.54mm:PinHeader_1x11_P2.54mm_Vertical	J3
1	DEBUG	Connector_JST:JST_XH_B3B-XH-A_1x03_P2.50mm_Vertical	J8
1	L7805	Package_TO_SOT_THT:TO-220-3_Vertical	U2
1	Motor 1	Connector_JST:JST_XH_B4B-XH-A_1x04_P2.50mm_Vertical	J1
1	Motor 2	Connector_JST:JST_XH_B4B-XH-A_1x04_P2.50mm_Vertical	J5
1	Motor 3	Connector_JST:JST_XH_B4B-XH-A_1x04_P2.50mm_Vertical	J4
1	Motor 4	Connector_JST:JST_XH_B4B-XH-A_1x04_P2.50mm_Vertical	J6
1	Pico	MCU_RaspberryPi_and_Boards:RPi_Pico_SMD_TH	U1
1	UART	Connector_JST:JST_XH_B3B-XH-A_1x03_P2.50mm_Vertical	J2

Questions

How big is the Dev board PCB?

It measures 64.9 × 66.2 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Dev board use?

27 parts, built around the L7805 and CON-SOCJ-2155. 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 Dev board KiCad files?

From the rc-sr/tentacle repository on GitHub, at the commit this page was made from: the board is hardware/pcb/dev-board/dev-board.kicad_pcb and its schematic hardware/pcb/dev-board/dev-board.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Dev board design in my own project?

Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).

Category and platform

Microcontroller boards RP2040

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/rc-sr-tentacle-dev-board" title="Dev board in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/rc-sr-tentacle-dev-board.jpg" alt="Dev board" width="1200" height="900">

A picture that opens the board, for a README

[![Dev board](https://pcbkit.io/embed/boards/rc-sr-tentacle-dev-board.jpg?size=s)](https://pcbkit.io/boards/rc-sr-tentacle-dev-board)

Source

Repository: rc-sr/tentacle
Board file: hardware/pcb/dev-board/dev-board.kicad_pcb
Commit: 4278df9
Licence: MIT

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