HardLabs

Just Cuz Logging Current Meter

JustCuzRobotics·Just_Cuz_Logging_Current_Meter

Just Cuz Logging Current Meter PCB layout, top view — open source RP2040/RP2350 board by JustCuzRobotics
Simulate this board

About the Just Cuz Logging Current Meter PCB

Just Cuz Logging Current Meter is an open source RP2040/RP2350 PCB design by JustCuzRobotics, published on GitHub under the CC-BY-NC-4.0 license. It is a 4-layer board measuring 95 × 62 mm, with 39 components from 23 distinct parts.

Its main chip is the RP2040-Zero, from the RP2040/RP2350 family. Other key parts include the ACS770KCB-150U-PFF-T. By type, the board carries 17 resistors, 11 capacitors, 3 connectors, 2 ICs, 2 switches and 1 jumper.

From the project

A 150 A / 60 V inline power meter and datalogger for RC ESC test benches, a WM150-class meter with live logging, a graphing touchscreen, and thermistor plus ESC-signal channels.

A 150 A / 60 V inline power meter and datalogger for RC ESC test benches, a WM150-class meter with live logging, a graphing touchscreen, and thermistor plus ESC-signal channels.

Status: Rev A built, assembled and brought up (2026-08-25). Display, capacitive touch, all four analog channels, backlight and the ESC output all work. Voltage and thermistor are calibrated. Two known Rev A faults: the buttons are dead (footprint pad mapping) and JP1 ships open. See "Known open items". Bring-up firmware is in firmware/.

Main components on the Just Cuz Logging Current Meter

ACS770KCB-150U-PFF-TRP2040-Zero

Just Cuz Logging Current Meter bill of materials (BOM)

39 components, 23 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ACS770KCB-150U-PFF-T
U1
1
RP2040-Zero
U2
1
NTC 100k B3950
J5
1
C2856800
Display 14p FPC 0.5mm
J7
1
ESC 3-pin
J8
1
5V / 3V3
JP1
1
100k
RV1
1
TS-1187A-B-A-B
MODE
SW1
1
TS-1187A-B-A-B
ZERO/TARE
SW2
1
BAT54S
D1
1
C1017
600R@100MHz 2A
FB1
6
100N
100n
C1, C5, C6, C7, C9, C11
2
10U
10u
C2, C8
2
10N
10n
C3, C4
1
C970684
100u 16V
C10
1
C17526
2.4k 1%
R1
1
C17673
4.7k 1%
R2
2
C149504
100k 1%
R3, R4
3
C17414
10k 1%
R5, R6, R8
2
1k
R7, R9
Show 3 more
QtyPartRefs
5
C17477
0R
R10, R11, R12, R13, R14
2
10k DNP
R15, R16
1
100R
R17

Just Cuz Logging Current Meter design files

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

Just Cuz Logging Current Meter: common questions

What microcontroller does the Just Cuz Logging Current Meter use?

The Just Cuz Logging Current Meter is built around the RP2040-Zero, from the RP2040/RP2350 family.

How big is the Just Cuz Logging Current Meter PCB?

The Just Cuz Logging Current Meter measures 95 × 62 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Just Cuz Logging Current Meter?

39 components, from 23 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 Just Cuz Logging Current Meter design files?

From the JustCuzRobotics/Just_Cuz_Logging_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 Just Cuz Logging Current Meter 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 Just Cuz Logging Current Meter without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.

Similar boards