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Mini current meter

hnz1102·mini-current-meter·hardware/currentmeter.kicad_pcb

Mini current meter PCB layout, top view — open source ESP32 board by hnz1102

About the Mini current meter PCB

Mini current meter is an open source ESP32 PCB design by hnz1102, published on GitHub. It is a 2-layer board measuring 30 × 43 mm, with 38 components from 27 distinct parts.

Its main chip is the ESP32-C3-WROOM-02-N4, from the ESP32 family. Other key parts include the SPX3819M5-L, SSD1306_DISPLAY, MCP73831-2-OT and INA228. By type, the board carries 17 resistors, 6 capacitors, 5 ICs, 3 connectors, 3 diodes and 2 switches.

It belongs with the iot & wireless, power & battery and test & measurement designs in this gallery.

From the project

Mini Current Meter using INA228A ultra-precise digital power monitor

This tool provides a logging function that captures data on voltage, current and power consumption. Voltage input range is from 0 to 35V, maximum current input is 10A.

High-resolution - By using Texas Instruments INA228 IC - 20-bit delta-sigma ADC, it can obtain measurement data with 195µV bus voltage and 163.84mV shunt voltage resolution.

Microcontroller on board - No need for a client PC when measuring. Data is sent directly to the server.

Mini current meter, from the project README
From the project README

Main components on the Mini current meter

ESP32-C3-WROOM-02-N4SPX3819M5-LSSD1306_DISPLAYMCP73831-2-OTINA228

Mini current meter bill of materials (BOM)

38 components, 27 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ESP32-C3-WROOM-02-N4
U101
1
SPX3819M5-L
U102
1
SSD1306_DISPLAY
U103
1
MCP73831-2-OT
U104
1
INA228
U302
1
SSM3J332R
Q102
1
USB4105-GF-A
J101
1
CONN_01X03
Conn_01x03
J102
1
LiPo BATTERY
J103
1
SLIDE_SW
SW105
1
732-435151014824
3.5x2.6 Tact SW
SW201
1
3147-B1931URO-20D000114U1930
LED RED
D102
1
3147-B1911PG--20D000514U1930
LED GREEN
D103
1
CUS10F30
NSR0340HT1G
D104
1
MH2029-601Y
FB101
1
4.7UF
4.7uF
C108
2
1UF
1uF
C109, C113
2
0.1UF
0.1uF
C111, C304
1
10UF
10uF
C112
2
5.1K
R103, R104
Show 7 more
QtyPartRefs
3
311-20.0KHR
20K 1%
R106, R120, R121
1
311-12.0KHR
12K 1%
R107
6
10K
R108, R110, R202, R302, R303, R304
1
2K
R115
2
330
R118, R119
1
100K
R122
1
5m
R308

Mini current meter design files

The KiCad project lives in the hnz1102/mini-current-meter repository on GitHub; these links point at the commit this page was built from.

Mini current meter: common questions

What microcontroller does the Mini current meter use?

The Mini current meter is built around the ESP32-C3-WROOM-02-N4, from the ESP32 family.

How big is the Mini current meter PCB?

The Mini current meter measures 30 × 43 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Mini current meter?

38 components, from 27 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 Mini current meter design files?

From the hnz1102/mini-current-meter 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 Mini current meter design in my own project?

The repository has no license, so all rights stay with hnz1102. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Mini current meter 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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