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Triaxial loadcell breakout

Scottapotamas·triaxial-loadcell-breakout·electronics/triax-loadwing.kicad_pcb

Triaxial loadcell breakout layout, top view — open source board by Scottapotamas
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About the Triaxial loadcell breakout

Triaxial loadcell breakout is an open source PCB design by Scottapotamas, published on GitHub. It is a 2-layer board measuring 60 × 30 mm, with 52 components from 15 distinct parts.

Other key parts include the NAU7802 and TCA9548A. By type, the board carries 20 capacitors, 19 resistors, 5 connectors, 4 ICs, 3 jumpers and 1 diode.

It belongs with the dev boards & breakouts designs in this gallery.

From the project

Breakout board to sample 3-axis load cells with I2C interface

Sourcing the NAU7802 seems easier than the HX711, and I2C suits my application nicely. The NAU7802 featured on Sparkfun's Qwiic Scale breakout board has a hardcoded single I2C address, meaning only one loadcell can be put on a single I2C bus.

I wanted to connect a triaxial load cell (3-dof, translational +- in xyz), so this breakout board puts 3x NAU7802 behind an I2C mux, a Texas Instruments TCA9548 8-channel mux (only channels 0, 1, 2 are used).

Triaxial loadcell breakout, from the project README
From the project README

Main components on the Triaxial loadcell breakout

NAU7802TCA9548A

Triaxial loadcell breakout bill of materials (BOM)

52 components, 15 distinct parts — part numbers from the project's BOM.

QtyPartRefs
3
NAU7802
U1, U2, U3
1
TCA9548A
U4
3
CONN_01X06
P1, P2, P3
1
CONN_01X08
P4
1
JST_SH_4_RA
P5
3
JUMPER-LINK-2
JP1, JP2, JP3
1
LED_RED_1608M
D1
9
100n_X7R_1608M
C1, C3, C5, C7, C8, C9, C13, C14 +1
6
100n_1608M
C2, C4, C6, C10, C11, C12
4
1u_X7R_1608M
C16, C17, C18, C19
1
10u_X7R_2012M
C20
6
47R_1608M
R1, R2, R3, R4, R5, R6
11
4K7_1608M
R7, R8, R9, R10, R11, R12, R13, R14 +3
1
10K_QUAD_1608M
R16
1
1K00_1608M
R19

Triaxial loadcell breakout design files

The KiCad project lives in the Scottapotamas/triaxial-loadcell-breakout repository on GitHub; these links point at the commit this page was built from.

Triaxial loadcell breakout: common questions

How big is the Triaxial loadcell breakout?

The Triaxial loadcell breakout measures 60 × 30 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Triaxial loadcell breakout?

52 components, from 15 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Triaxial loadcell breakout design files?

From the Scottapotamas/triaxial-loadcell-breakout repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Triaxial loadcell breakout design in my own project?

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

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