HardLabs

Batterymonitor

44sac·batterymonitor·kicad/batt-monitor-v1-1.kicad_pcb

Batterymonitor PCB layout, top view — open source ESP32 board by 44sac

About the Batterymonitor PCB

Batterymonitor is an open source ESP32 PCB design by 44sac, published on GitHub under the MIT license. It is a 2-layer board measuring 32.5 × 52.3 mm, with 29 components from 17 distinct parts.

Its main chip is the ESP32-C3-WROOM-02-N4, from the ESP32 family. Other key parts include the AP7361C-33ER-13 and TMP235AEDCKRQ1. By type, the board carries 12 resistors, 7 capacitors, 4 diodes, 3 ICs and 3 connectors.

It belongs with the iot & wireless, power & battery and usb & debug tools designs in this gallery.

From the project

ESP32-C3 based Wi-Fi car battery monitor

Wi-Fi battery monitor using a custom ESP32-C3 board

I drive a Crown Victoria Police Interceptor. It is old. The only way I can tell if it has issues is through the instrument cluster.

When I don't drive for extended periods, the battery can drain to a harmful level. I needed an alert system for when the battery needs charging to avoid killing it (again, oops).

Main components on the Batterymonitor

AP7361C-33ER-13TMP235AEDCKRQ1ESP32-C3-WROOM-02-N4

Batterymonitor bill of materials (BOM)

29 components, 17 distinct parts.

QtyPartRefs
1
AP7361C-33ER-13
IC1
1
TMP235AEDCKRQ1
IC2
1
ESP32-C3-WROOM-02-N4
U1
1
2169900002
USB-C Connector
J1
1
Screw_Terminal_01x02
J2
1
Conn_01x10_Female
J3
2
LED
D1, D2
2
ESD9B5.0ST5G
D3, D4
1
10uF
C1
2
0.1uF
C2, C3
2
22uF
C4, C5
2
1uF
C6, C7
1
0
R1
6
10K
R2, R3, R11, R12, R13, R14
2
5.1K
R4, R5
2
1K
R6, R10
1
39K
R9

Batterymonitor design files

The KiCad project lives in the 44sac/batterymonitor repository on GitHub; these links point at the commit this page was built from.

Batterymonitor: common questions

What microcontroller does the Batterymonitor use?

The Batterymonitor is built around the ESP32-C3-WROOM-02-N4, from the ESP32 family.

How big is the Batterymonitor PCB?

The Batterymonitor measures 32.5 × 52.3 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Batterymonitor?

29 components, from 17 distinct parts. The full bill of materials is listed on this page.

Where can I download the Batterymonitor design files?

From the 44sac/batterymonitor repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Batterymonitor design in my own project?

Yes, under the terms of its MIT license, which 44sac chose for the repository.

Can I test firmware for the Batterymonitor 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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