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Switch-N-Sense

LibreSolar·bms-5s50-sc·power-pcb/Switch-N-Sense.kicad_pcb

Switch-N-Sense PCB layout, top view — open source board by LibreSolar
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About the Switch-N-Sense PCB

Switch-N-Sense is an open source PCB design by LibreSolar, published on GitHub under the CC-BY-SA-4.0 license. It is a 2-layer board measuring 94 × 57.5 mm, with 35 components from 16 distinct parts.

Other key parts include the BQ76200. By type, the board carries 14 resistors, 7 capacitors, 5 transistors, 5 connectors, 2 diodes and 1 IC.

It belongs with the power & battery designs in this gallery.

From the project

Battery management system for up to 5 Li-ion cells based on TI bq76920

Battery management system for up to 5 Li-ion cells based on bq76920 IC from Texas Instruments

The Libre Solar BMS is divided into two different boards, connected via a flat cable and integrated into one housing.

- 3 to 5 Li-ion cells (e.g. LiFePO4) - 50 A maximum current - Balancing current approx. 150 mA - STM32F072 ARM Cortex M0 microcontroller - Built-in CAN communication interface and UEXT extension connector

Switch-N-Sense, from the project README
From the project README

Main components on the Switch-N-Sense

BQ76200

Switch-N-Sense bill of materials (BOM)

35 components, 16 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
BQ76200
Texas Instruments
U1
4
BSC014N04LS
Infineon
Q1, Q2, Q3, Q4
1
ZXMP6A13F
Diodes Incorporated
Q5
4
CONN_01X01
Wuerth
P2, P3, P4, P5
1
Conn_Switch-N-Sense
Wuerth
P6
1
10K
10k
TDK
RT1
2
SMCJ24A
Bourns
D1, D2
1
1u
Yageo
C1
2
10N
10n
Yageo
C2, C5
4
100N
100n
Yageo
C3, C4, C6, C7
2
2m
Bourns
R1, R2
3
330
Yageo
R5, R6, R7
2
100
Yageo
R8, R13
2
4.7
Yageo
R9, R12
2
1M
Yageo
R10, R11
3
1k
Yageo
R14, R15, R16

Switch-N-Sense design files

The KiCad project lives in the LibreSolar/bms-5s50-sc repository on GitHub; these links point at the commit this page was built from.

Switch-N-Sense: common questions

How big is the Switch-N-Sense PCB?

The Switch-N-Sense measures 94 × 57.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Switch-N-Sense?

35 components, from 16 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 Switch-N-Sense design files?

From the LibreSolar/bms-5s50-sc repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Switch-N-Sense design in my own project?

Yes, under the terms of its CC-BY-SA-4.0 license, which LibreSolar chose for the repository.

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