HardLabs

V4

chipsi·diyBMSv4·ModuleV400/v4.kicad_pcb

V4 PCB layout, top view — open source AVR/Arduino board by chipsi

About the V4 PCB

V4 is an open source AVR/Arduino PCB design by chipsi, published on GitHub under the CC-BY-NC-4.0 license. It is a 2-layer board measuring 30 × 50 mm, with 38 components from 28 distinct parts.

Its main chip is the ATtiny841-SSU, from the AVR/Arduino family. Other key parts include the HMHA2801. By type, the board carries 23 resistors, 4 diodes, 3 LEDs, 3 capacitors, 2 ICs and 1 transistor.

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

From the project

Do it yourself battery management system for Lithium ion battery packs/cells

Do it yourself battery management system for Lithium ion battery packs/cells

More discussion Open Energy Monitor Forum

If you are looking for version 3 (obsolete) of this project take a look here

THIS REPOSITORY CONTAINS THE HARDWARE FOR THE SYSTEM

If you find the BMS useful, please consider buying me a beer, check out Patron for more information

This repository contains the hardware designs, generally in KiCad format. Unless you are changing the design, you don't need to use/install KiCad, just use the premade files.

Main components on the V4

HMHA2801ATtiny841-SSU

V4 bill of materials (BOM)

38 components, 28 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
HMHA2801
U1
1
ATtiny841-SSU
U4
1
IRLML6244TRPBF
Q1
1
AVR-ISP-6
J2
1
Remote temp input 47K @ 25oC
SENSOR1
1
Battery
POWER1
1
RX Connector
RX1
1
TX Connector
TX1
1
LM4040BIM3-2.0/NOPB, 2.048V, SOT-23-3
D1
1
Blue
D2
1
RED LED
D3
1
Green
D4
1
100nF
C1
1
2.2uF
C2
1
10uF 10V
C3
1
10K
R1
1
1K
R2
1
475K E96 series (tolerance 1%)
R3
1
402K E96 series (tolerance 1%)
R4
1
220R
R5
Show 8 more
QtyPartRefs
8
2R2 1W
R6, R7, R8, R9, R10, R11, R12, R13
1
510R
R14
3
47K
R15, R20, R21
1
4K7
R16
2
2K2
R17, R18
1
SDNT2012X473F4150FTF
R19
1
10R
R22
1
2K2
R23

V4 design files

The KiCad project lives in the chipsi/diyBMSv4 repository on GitHub; these links point at the commit this page was built from.

V4: common questions

What microcontroller does the V4 use?

The V4 is built around the ATtiny841-SSU, from the AVR/Arduino family.

How big is the V4 PCB?

The V4 measures 30 × 50 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the V4?

38 components, from 28 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 V4 design files?

From the chipsi/diyBMSv4 repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the V4 design in my own project?

It is published under CC-BY-NC-4.0, which limits how it may be reused; read the license before building on it.

Can I test firmware for the V4 without the hardware?

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

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