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Caliper mod

RasmusKoit·caliper-mod·PCB/caliper-mod.kicad_pcb

Caliper mod PCB layout, top view — open source board by RasmusKoit
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About the Caliper mod PCB

Caliper mod is an open source PCB design by RasmusKoit, published on GitHub. It is a 2-layer board measuring 25.5 × 70.6 mm, with 12 components from 9 distinct parts.

Other key parts include the STLQ015M15R and MCP73831T-2ACI/OT. By type, the board carries 4 capacitors, 4 resistors, 2 ICs, 1 connector and 1 diode.

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

From the project

This project involves modifying inexpensive digital calipers purchased from AliExpress by replacing the internal CR44 battery with a custom PCB. The modification adds the following features:

This project involves modifying inexpensive digital calipers purchased from AliExpress by replacing the internal CR44 battery with a custom PCB. The modification adds the following features:

- USB-C Charging: A USB-C connector is added to charge a LiPo battery. - LiPo Battery Integration: A LiPo battery powers the calipers, eliminating the need for disposable batteries. - Voltage Conversion: The LiPo battery voltage is converted to 1.5V to match the calipers' power requirements.

Caliper mod, from the project README
From the project README

Main components on the Caliper mod

STLQ015M15RMCP73831T-2ACI/OT

Caliper mod bill of materials (BOM)

12 components, 9 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
STLQ015M15R
LDK130-15_SOT23_SOT353
U1
1
MCP73831T-2ACI/OT
MCP73831-2-OT
U2
1
USB4125-GF-A-0190
USB_C_Receptacle_PowerOnly_6P
J1
1
LTST-C190KRKT
LED
D1
2
LMK107BJ475KA-T
4.7uF
C1, C2
2
LMK107B7105KA-T
1uF
C3, C4
1
CRG0603F56K
56k
R1
1
CRG0603F1K5
1.5k
R2
2
CRG0603F5K1
5.1k
R3, R4

Caliper mod design files

The KiCad project lives in the RasmusKoit/caliper-mod repository on GitHub; these links point at the commit this page was built from.

Caliper mod: common questions

How big is the Caliper mod PCB?

The Caliper mod measures 25.5 × 70.6 mm, has 2 copper layers and is 0.8 mm thick.

How many components are on the Caliper mod?

12 components, from 9 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 Caliper mod design files?

From the RasmusKoit/caliper-mod 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 Caliper mod design in my own project?

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

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