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Cap sense ctrl

gregdavill·cap-sense-flex·hardware/cap-sense-ctrl-r0.1/cap-sense-ctrl.kicad_pcb

Cap sense ctrl PCB layout, top view — open source Microchip SAM board by gregdavill

About the Cap sense ctrl PCB

Cap sense ctrl is an open source Microchip SAM PCB design by gregdavill, published on GitHub. It is a 4-layer board measuring 33.6 × 18 mm, with 32 components from 16 distinct parts.

Its main chip is the ATSAMD21E18A, from the Microchip SAM family. Other key parts include the AD7746, MCP1700-3302E_SOT23 and TMUX1511. By type, the board carries 8 resistors, 7 capacitors, 5 ICs, 4 transistors, 4 diodes and 3 connectors.

From the project

A prototype of a flex measuring sensor. Based off: https://dl.acm.org/doi/10.1145/3313831.3376269

A prototype of a flex measuring sensor. Based off: https://dl.acm.org/doi/10.1145/3313831.3376269

This design will attempt to utilise OSHPark Flex for the sensor elements, which provides a low cost solution for prototyping flexible circuits. But you are limited to a 5mil polymide core.

Main components on the Cap sense ctrl

AD7746MCP1700-3302E_SOT23ATSAMD21E18ATMUX1511

Cap sense ctrl bill of materials (BOM)

32 components, 16 distinct parts.

QtyPartRefs
1
AD7746
U1
1
MCP1700-3302E_SOT23
U2
1
ATSAMD21E18A
U3
2
TMUX1511
U4, U5
4
Q_PMOS_GSD
Q1, Q2, Q3, Q4
1
USB_C_Receptacle_USB2.0
J1
2
Conn_01x08_MountingPin
J2, J3
1
SW_RESET
SW1
4
LED_ARGB
D1, D2, D3, D4
2
1uF
C1, C4
4
0.1uF
C2, C5, C6, C7
1
10uF
C3
1
360R
R1
2
150R
R2, R3
2
5.1K
R4, R5
3
1K
R6, R7, R8

Cap sense ctrl design files

The KiCad project lives in the gregdavill/cap-sense-flex repository on GitHub; these links point at the commit this page was built from.

Cap sense ctrl: common questions

What microcontroller does the Cap sense ctrl use?

The Cap sense ctrl is built around the ATSAMD21E18A, from the Microchip SAM family.

How big is the Cap sense ctrl PCB?

The Cap sense ctrl measures 33.6 × 18 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Cap sense ctrl?

32 components, from 16 distinct parts. The full bill of materials is listed on this page.

Where can I download the Cap sense ctrl design files?

From the gregdavill/cap-sense-flex repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Cap sense ctrl design in my own project?

The repository has no license, so all rights stay with gregdavill. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Cap sense ctrl without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug Microchip SAM firmware against it before you order a PCB.

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