HardLabs

DIYBMS ESP32 Controller

chipsi·diyBMSv4·ControllerCircuit/ControllerCircuit.kicad_pcb

DIYBMS ESP32 Controller PCB layout, top view — open source ESP32 board by chipsi

About the DIYBMS ESP32 Controller PCB

DIYBMS ESP32 Controller is an open source ESP32 PCB design by chipsi, published on GitHub under the CC-BY-NC-4.0 license. It is a 2-layer board measuring 122.5 × 87.6 mm, with 77 components from 42 distinct parts.

Its main chip is the ESP32-DEVKITC-32D, from the ESP32 family. Other key parts include the TJA1057GT/3, EL3H7(B)(TA)-G, TCA6408APWR, SN65HVD75DR and AMS1117-3.3. By type, the board carries 24 resistors, 15 connectors, 10 ICs, 9 capacitors, 8 diodes and 3 transistors.

From the project

This is the latest version of the diyBMS controller

This is the latest version of the diyBMS controller

THIS REPOSITORY CONTAINS THE HARDWARE FOR THE SYSTEM

The latest version of the controller uses an ESP32 and supports CANBUS, RS485, SD CARD logging, relays, SSR outputs, multiple inputs, AVR programmer and much more.

Although the hardware is complete, not all features are usable from the software, this will be developed and improved over time to make use of the hardware.

Main components on the DIYBMS ESP32 Controller

TJA1057GT/3EL3H7(B)(TA)-GTCA6408APWRESP32-DEVKITC-32DSN65HVD75DRAMS1117-3.3TCA9534AAQY212GSZATTINY841-SSU

DIYBMS ESP32 Controller bill of materials (BOM)

77 components, 42 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
TJA1057GT/3
U1
1
EL3H7(B)(TA)-G
U2
1
TCA6408APWR
U3
1
ESP32-DEVKITC-32D
U4
1
SN65HVD75DR
U5
1
AMS1117-3.3
U6
1
TCA9534A
U8
2
AQY212GSZ
U9, U12
1
ATTINY841-SSU
ATtiny841-SSU
U10
2
AO3400A
Q1, Q2
1
AO3401A
Q3
6
ScrewTerminal
J1, J4, J5, J7, J12, J14
2
SCREWTERMINAL3PIN
ScrewTerminal3Pin
J2, J3
1
AVR-ISP-6
J6
1
AVR-ISP-6
2x3 2.54mm IDC Connectors
J8
1
CONN_01X06_FEMALE
Conn_01x06_Female
J9
1
CONN_01X02_FEMALE
Conn_01x02_Female
J10
1
CONN_01X03_FEMALE
Conn_01x03_Female
J11
1
CONN_01X02_FEMALE
Conn_01x02_Female
J13
1
0472192001
Molex 0472192001
J15
Show 22 more
QtyPartRefs
1
Fuse, 1.85A
F1
2
CONN_01X02_FEMALE
Conn_01x02_Female
JP2, JP3
2
SRD-05VDC-SL-C
K1, K2
1
LCD
LCD1
1
Receive
RX1
1
Transmit
TX1
1
RGB
D1
2
LL4148
D2, D5
3
YELLOW LED
D3, D4, D6
1
D_Zener_Small
D7
1
NUP2105LT1G
D8
5
100NF
100nF
C1, C2, C5, C6, C8
2
22uF 6.3V
C3, C4
2
1UF
1uF
C9, C10
2
100R
R1, R8
3
2K2
R2, R5, R16
3
180R
R3, R21, R22
2
300R
R4, R17
2
120R
R6, R9
4
220R
R10, R14, R18, R25
6
10K
R11, R15, R19, R20, R23, R24
2
560R
R12, R13

DIYBMS ESP32 Controller design files

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

DIYBMS ESP32 Controller: common questions

What microcontroller does the DIYBMS ESP32 Controller use?

The DIYBMS ESP32 Controller is built around the ESP32-DEVKITC-32D, from the ESP32 family.

How big is the DIYBMS ESP32 Controller PCB?

The DIYBMS ESP32 Controller measures 122.5 × 87.6 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the DIYBMS ESP32 Controller?

77 components, from 42 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 DIYBMS ESP32 Controller design files?

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

Can I use the DIYBMS ESP32 Controller 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 DIYBMS ESP32 Controller without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.

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